CN104564113A - Construction method for grouting reinforcement of surrounding rock fiber slurry of roadway - Google Patents

Abstract

The invention discloses a construction method for grouting reinforcement of surrounding rock fiber slurry of a roadway. The grouted slurry is fiber slurry, and the fiber slurry is grouting-reinforced by the construction method comprises the steps of drilling holes in the surrounding rock; positioning separating pipes after hole drilling; detonating explosives which are positioned on the inner walls of the separating pipes in advance; positioning anchoring rods in the separating pipes; respectively sleeving the anchoring rods and the separating pipes with slurry stopping plugs to form a double-ring slurry stopping plug; mounting a tray; screwing a nut; grouting the fiber slurry for the first time; connecting grouting pipes with the separation pipes to enable the fiber slurry to penetrate into the surrounding rock through the separation pipes; grouting for the second time; connecting the grouting pipes with the anchoring rods to enable portland cement and sodium silicate slurry to be grouted through the anchoring rods. With the adoption of the construction method, the anchoring rods can act with high performance under a high stress state; the integrity of the anchoring rods, the slurry, the fibers and the surrounding rock can be improved, and the four parts can coordinate to act, so as to completely improve the property of the surrounding rocks, and as a result, the stability of the whole surrounding rock can be ensured.

Description

Construction method of roadway surrounding rock fiber grout grouting reinforcement

technical field

The invention relates to a rock soil reinforcement construction method in the construction of high-stress multi-crack roadways in underground projects such as mine engineering and tunnel engineering, in particular to a construction method for fiber grouting reinforcement of roadway surrounding rocks.

Background technique

In mining engineering, tunnel engineering and other underground projects, as the surrounding rock is exposed during roadway excavation, the in-situ stress begins to release gradually, and the primary cracks in the rock expand to produce secondary cracks, which greatly threatens the safety and stability of the roadway. At this time, it is necessary to take effective measures to strengthen the surrounding rock of the roadway, control its deformation, stabilize its force, ensure the stability of the surrounding rock, and adopt effective support methods to improve the strength of the surrounding rock itself and ensure the coordination between the support structure and the surrounding rock. They work together to resist the ground stress and ensure that the deformation and force of the surrounding rock are controlled within a reasonable range.

In terms of roadway support, the use of traditional active support such as bolts can play a role of suspension and compression to a certain extent, but it still cannot fundamentally change the nature of the surrounding rock itself, and especially in broken, soft In the rock roadway, the anchoring force of the bolt cannot reach the design value, and thus cannot maximize its function, which increases the difficulty of roadway support. At present, most of the grouting methods and construction methods use traditional grouting for grouting. Traditional grouting and grouting methods are limited in improving the strength of surrounding rock itself, especially the shear and tensile strength of cracks. It has not been substantially improved, and it has brought a huge threat to the efficient and safe production of underground engineering.

Contents of the invention

In order to solve the deficiencies of the prior art, the present invention proposes a construction method for reinforcement of roadway surrounding rock fiber grouting. The construction method can improve the overall strength of the surrounding rock by injecting the fiber-containing slurry into the surrounding rock with large fissures.

The present invention adopts following technical scheme:

The construction method of roadway surrounding rock fiber grouting reinforcement is to add alkali-resistant glass fiber to the grouting grout to form fiber grout, and the construction method of grouting reinforcement with fiber grout adopts the following steps:

(1) Drill the surrounding rock, put the isolation tube after the drilling is completed, detonate the explosives placed on the inner wall of the isolation tube in advance, and then place the anchor rod in the isolation tube. The function of the isolation tube is to block the grout to realize the second grouting And provide a carrier for blasting to open the crack opening;

(2) Set the grout stopper on the anchor rod and the isolation pipe respectively, make the grout stopper closely combine with the surrounding rock space, and install the tail of the grout stopper to form a double-ring grout stopper, then install the tray and tighten the nut;

(3) Perform a grouting injection of fiber slurry, the grouting pipe is connected to the isolation pipe, and the fiber slurry penetrates into the cracks of the surrounding rock through the isolation pipe;

(4) When the first grouting reaches the final grouting pressure for a period of time, the second grouting is performed, the grouting pipe is connected to the anchor rod, Portland cement and water glass grout are injected through the anchor rod, and the tray is removed during the grouting process. After reaching the final pressure of the second grouting, move out the isolation tube while grouting, completely remove the isolation tube, adjust the double-ring grout stopper, install the tray, and continue grouting until the final pressure of the second grouting is reached again for a period of time Stop grouting.

Preferably, the fiber slurry includes superfine cement, water, water reducing agent and alkali-resistant glass fiber, the mass ratio of water to superfine cement is 1.2:1-1:1, and the amount of superplasticizer is superfine 1%-2% of the cement mass, the amount of alkali-resistant glass fiber accounts for 1%-2% of the total volume;

Among them, the average particle size of ultra-fine cement is 2.8um-3.6um, and the maximum particle size does not exceed 20um; the water-reducing agent adopts Cai series high-efficiency water-reducing agent.

Preferably, the fiber slurry includes ordinary Portland cement, water, water reducer and alkali-resistant glass fiber, the mass ratio of water to ordinary Portland cement is 1.2:1-1:1, and the water reducer is mixed with The amount is 1%-2% of the mass of superfine cement, and the amount of alkali-resistant glass fiber accounts for 1%-2% of the total volume;

Among them, the average particle size of ordinary Portland cement is 36um-68um, and the maximum particle size does not exceed 80um; the water reducing agent adopts Cai series high-efficiency water reducing agent.

Preferably, the alkali-resistant glass fiber has a length of 1mm-6mm and a diameter of 10um-20um, and the alkali-resistant glass fiber is pretreated by the following steps:

a. Alkali-resistant glass fiber is first heat-treated at 350°C for 1 minute;

b. Place the alkali-resistant glass fiber in 20% dilute NaOH and dilute KOH solution and heat at 100°C for two hours;

c. Wash the alkali-resistant glass fiber with flowing distilled water at 100°C for 30 minutes.

Preferably, in the preparation process of the fiber slurry, the superfine cement/ordinary Portland cement and water are mixed and stirred according to the ratio for 1.5 minutes, and then the pretreated alkali-resistant glass fiber is added and stirred for 3 minutes.

Preferably, in the step (1), the diameter of the isolation tube is larger than the diameter of the anchor rod and smaller than the diameter of the borehole. The isolation tube is divided into a gas one-way valve, an inner closed steel pipe layer, and an outer elastic rubber layer. The isolation tube is provided with The gas one-way valve can transmit the detonation wave to the outer surrounding rock in one direction. The grouting pipe is fixed in the outer rubber layer, and the outer rubber layer of the isolation pipe has a grouting hole, and the anchor rod is also equipped with grouting The diameter of the hole, the outer rubber layer, and the grouting hole on the anchor rod is 30mm.

Preferably, in the step (1), a small amount of explosive charge is fixed inside the isolation tube, and the fine blasting transmits the vibration to the surrounding rock through the outer rubber layer in close contact with the surrounding rock, further opening the crack opening and releasing the ground stress.

Preferably, in the step (3), the grouting speed of one grouting is 20L/min, the final grouting pressure is 1.25MPa, and the pressure increases step by step during the grouting process, respectively at 0.5MPa, 0.75MPa, 1MPa, 1.25MPa grouting in sequence.

Preferably, described step (4) portland cement and water glass solution comprise water glass, water and cement, and the mass ratio of described water and cement is 0.8:1, and the volume ratio of cement and water glass is 1:1 ;

Among them, the average particle size of ordinary Portland cement is 56um-68um, and the maximum particle size does not exceed 80um; the concentration of water glass is 34Be’-40Be’, and the modulus of water glass is 2.4-2.8.

Preferably, in the step (4), the grouting speed of the secondary grouting is 10L/min, the final pressure of the grouting is 1.5MPa, after reaching the final pressure of the secondary grouting of 1.5MPa, the isolation pipe is moved out while grouting , after complete removal, adjust the double-ring grout stopper to install the tray until the final pressure of the second grouting is 1.5MPa again, and then stop the grouting.

The beneficial technical effects obtained by adopting the above scheme are:

The construction method of roadway surrounding rock fiber slurry grouting reinforcement is pre-blasting to enlarge the cracks and generate secondary cracks. The outer surrounding rock is filled with ultra-fine cement slurry with alkali-resistant glass fiber through one grouting injection, and the second time is used to fill the surrounding rock. Grouting injects fiber-free cement water glass slurry to fill the outer periphery of the bolt, and slowly moves the isolation pipe outward while grouting, so that the fiber-free slurry fills the surrounding rock with fiber-containing slurry under a certain pressure The secondary filling of the small gaps in the portland cement water glass grout accelerated the solidification time of the grout, which provided technical support for the rapid sealing of the grout interface and the acceleration of the construction progress after the excavation of the surrounding rock. At the same time, the compactness of the surrounding rock filled with fiber slurry is ensured, so that the shear strength and tensile strength of the surrounding rock are effectively strengthened, and the fiber-free slurry is also filled around the bolt, so that the close contact and adhesion between the slurry and the bolt Consolidation, to ensure that the bolt can play a role with high performance under high stress conditions, improve the integrity of the bolt, slurry, fiber, and surrounding rock, and make the four work together to fundamentally improve the properties of the surrounding rock. Guarantee the overall stability of the surrounding rock, and provide strong technical support for safe production on site and guarantee of life and property.

Description of drawings

Figure 1 is a flow chart of the construction method of roadway surrounding rock fiber grouting reinforcement.

Figure 2 is a schematic diagram of the installation of the double-ring stopper.

Fig. 3 is a schematic diagram of removing the isolation pipe in the secondary grouting.

Fig. 4 is a schematic diagram of the roadway surrounding rock after the fiber grouting reinforcement construction is completed.

Detailed ways

The specific embodiment of the present invention is described further in conjunction with accompanying drawing 1 to 4:

Example 1:

Surrounding rock with crack opening less than 1mm.

Alkali-resistant glass fibers are selected with a length of 1mm and a diameter of 10um, so that the fiber slurry can enter the cracks of the surrounding rock, fundamentally improve the properties of the surrounding rock, and ensure the overall stability of the surrounding rock. The following steps are used to pretreat the alkali-resistant glass fiber:

a. Alkali-resistant glass fiber is first heat-treated at 350°C for 1 minute;

b. Place the alkali-resistant glass fiber in 20% dilute NaOH and dilute KOH solution and heat at 100°C for two hours;

c. Wash the alkali-resistant glass fiber with flowing distilled water at 100°C for 30 minutes.

The fiber slurry includes superfine cement, water, water reducing agent and alkali-resistant glass fiber. The mass ratio of water to superfine cement is 1:1, and the amount of water reducing agent is 1% of the mass of superfine cement. Alkali-resistant glass The amount of fiber accounts for 1% of the total volume. The average particle size of ultrafine cement is 2.8um-3.6um, and the maximum particle size does not exceed 20um. things.

In the process of fiber slurry preparation, the superfine cement, water and water reducer are mixed and stirred for 1.5 minutes according to the ratio, and then the pretreated alkali-resistant glass fiber is added and stirred for 3 minutes. The use of ultra-fine cement to configure the above-mentioned fiber slurry is to allow the fiber slurry to better penetrate into the cracks of the surrounding rock.

Ordinary Portland cement and water glass solution comprise water glass, water, and cement, and the mass ratio of described water and cement is 0.8:1, and the volume ratio of cement and water glass is 1:1; Wherein ordinary Portland cement average The particle size is 56um-68um, and the maximum particle size does not exceed 80um; the concentration of water glass is 34Be', and the modulus of water glass is 2.4.

The construction method of fibrous slurry grouting reinforcement in roadway surrounding rock with crack opening less than 1mm adopts the following steps:

(1) The surrounding rock 1 is drilled to obtain the borehole 3. After the drilling is completed, the isolation tube 4 is placed, and the explosive placed on the inner wall of the isolation tube is detonated. The anchor rod 5 is placed in the isolation tube 4. The effect of the isolation tube is to seal The plugging fluid realizes secondary grouting and provides a carrier for blasting to open the crack opening;

Wherein, the diameter of the isolation pipe 4 is larger than the diameter of the anchor rod 5 and slightly smaller than the diameter of the borehole 3. The isolation pipe is divided into a gas one-way valve, an inner closed steel pipe layer, and an outer elastic rubber layer. The isolation pipe is provided with a gas one-way valve. The detonation wave can be transmitted to the external surrounding rock in one direction. The grouting pipe is fixed in the outer rubber layer. There are grouting holes on the outer rubber layer of the isolation pipe. At the same time, there are also grouting holes on the bolt. The outer rubber layer The diameter of the grouting hole on the layer and the anchor rod is 30mm.

The function of the isolation tube: a small amount of explosive powder is fixed on the inner side of the isolation tube in the early stage of grouting, and a gas one-way valve is installed on the wall of the isolation tube. Transmission, to further open the opening of the crack and release the ground stress; the second is to block the grout to realize layered grouting, inject the grout with fibers into the surrounding rock to enhance its shear and tensile properties, and inject fiber-free grout around the anchor rod to strengthen Adhesive effect, play the role of anchor rod more firmly.

(2) Set the grout stopper on the anchor rod 5 and the isolation pipe 4 respectively (as shown in Figure 2), so that the grout stopper is closely combined with the surrounding rock space, and the tail of the grout stopper is installed to form a double-ring grout stopper 6, and then Install the tray and tighten the nuts;

(3) carry out a grouting injection fiber slurry, the grouting pipe is connected to the isolation pipe 4, and the fiber slurry penetrates into the surrounding rock fissure through the grouting hole of the isolation tube;

The grouting speed of one grouting is 20L/min, and the final grouting pressure is 1.25MPa. During the grouting process, the pressure increases step by step.

(4) When the primary grouting reaches the grouting final pressure for 30 minutes, the secondary grouting is carried out, the grouting pipe is connected to the anchor rod 5, Portland cement and water glass grout are injected through the grouting hole of the anchor rod, during the grouting process Remove the tray 7, the grouting speed of the secondary grouting is 10L/min, and the final pressure of grouting is 1.5MPa. After reaching the final pressure of the secondary grouting of 1.5MPa, move out the isolation pipe 4 while grouting (as shown in Figure 3 As shown), completely remove the isolation tube 4 and adjust the double-ring grout stopper 6, then install the tray 7, tighten the nuts, and continue grouting until the final pressure of the secondary grouting is 1.5MPa again, then stop grouting 60 seconds later.

At the end of grouting (as shown in Figure 4), the alkali-resistant glass fiber 8 in the fiber slurry is close to the surrounding rock and enters the crack. The slurry near the anchor does not contain alkali-resistant glass fiber, and the secondary grouting does not contain silicon fiber Fill the outer periphery of the bolt with salt cement water glass slurry, and slowly move the isolation pipe outwards while grouting, so that the fiber-free slurry can pass through the small gaps in the surrounding rock filled with fiber-containing slurry through a certain pressure. The Portland cement water glass slurry injected for the first filling and the second injection speeds up the solidification time of the slurry, which provides technical support for the rapid sealing of the slurry interface after the first grouting and the acceleration of the construction progress after the surrounding rock is excavated, and at the same time ensures that the surrounding rock The compactness of the fiber-filled slurry makes the shear strength and tensile strength of the surrounding rock effectively strengthened, and the fiber-free slurry is also filled around the anchor rod, which makes the close contact and cohesion between the slurry and the anchor rod ensure the anchor Rods can also function with high performance under high stress conditions.

Example 2:

Surrounding rock with a crack opening of 1mm-2mm.

The length of alkali-resistant glass fiber is 2mm and the diameter is 12um. The steps for pretreatment of alkali-resistant glass fiber are the same as in Example 1.

The fiber slurry includes ordinary Portland cement, water, water reducing agent and alkali-resistant glass fiber, the mass ratio of the water to ordinary Portland cement is 1:1, and the amount of water reducing agent is 100% of the ordinary Portland cement quality. 1%, the amount of alkali-resistant glass fiber accounts for 1% of the total volume, of which the average particle size of ordinary Portland cement is 36um-48um, and the maximum particle size does not exceed 60um; Chaesulfonate formaldehyde condensate.

During the fiber slurry preparation process, the ordinary portland cement, water and water reducer were mixed and stirred according to the ratio for 1.5 minutes, and then the pretreated alkali-resistant glass fiber was added and stirred for 3 minutes. Ordinary Portland cement is used to configure the above-mentioned fiber slurry, which not only meets the requirements for the fiber slurry to penetrate into the cracks of the surrounding rock, but also meets the requirements of economic cost, because the cost of ordinary Portland cement is lower than that of ultra-fine cement.

Ordinary Portland cement and water glass solution comprise water glass, water, and cement, and the mass ratio of described water and cement is 0.8:1, and the volume ratio of cement and water glass is 1:1; Wherein ordinary Portland cement average The particle size is 36um-48um, and the maximum particle size does not exceed 60um; the concentration of water glass is 34Be', and the modulus of water glass is 2.6.

The construction method for fiber grouting reinforcement of roadway surrounding rock with crack opening of 1mm-2mm adopts the same steps as in Example 1.

Example 3:

Surrounding rock with a crack opening of 2mm-3mm.

The length of alkali-resistant glass fiber is 3mm, and the diameter is 14um. The steps of pretreatment of alkali-resistant glass fiber are the same as in Example 1.

The fiber slurry includes ordinary Portland cement, water, water reducing agent and alkali-resistant glass fiber, the mass ratio of the water to ordinary Portland cement is 1.1:1, and the amount of water reducing agent is 100% of the quality of ordinary Portland cement. 1.5%, the amount of alkali-resistant glass fiber accounts for 1.5% of the total volume, of which the average particle size of ordinary Portland cement is 46um-58um, and the maximum particle size does not exceed 80um; Chaesulfonate formaldehyde condensate.

During the fiber slurry preparation process, the ordinary portland cement, water and water reducer were mixed and stirred according to the ratio for 1.5 minutes, and then the pretreated alkali-resistant glass fiber was added and stirred for 3 minutes. Ordinary Portland cement is used to configure the above-mentioned fiber slurry, which not only meets the requirements for the fiber slurry to penetrate into the cracks of the surrounding rock, but also meets the requirements of economic cost, because the cost of ordinary Portland cement is lower than that of ultra-fine cement.

Ordinary Portland cement and water glass solution comprise water glass, water, and cement, and the mass ratio of described water and cement is 0.8:1, and the volume ratio of cement and water glass is 1:1; Wherein ordinary Portland cement average The particle size is 46um-58um, and the maximum particle size does not exceed 80um; the concentration of water glass is 36Be', and the modulus of water glass is 2.6.

The construction method for fiber grouting reinforcement of roadway surrounding rock with crack opening of 2mm-3mm adopts the same steps as in Example 1.

Example 4:

Surrounding rock with a crack opening of 3mm-5mm.

The length of alkali-resistant glass fiber is 5mm, and the diameter is 16um. The steps for pretreatment of alkali-resistant glass fiber are the same as in Example 1.

The fiber slurry includes ordinary Portland cement, water, water reducing agent and alkali-resistant glass fiber, the mass ratio of the water to ultrafine cement is 1.1:1, and the amount of water reducing agent is 1.5% of the mass of ordinary Portland cement , the amount of alkali-resistant glass fiber accounts for 1.5% of the total volume, of which the average particle size of ordinary Portland cement is 46um-58um, and the maximum particle size does not exceed 80um; salt formaldehyde condensate.

During the fiber slurry preparation process, the ordinary portland cement, water and water reducer were mixed and stirred according to the ratio for 1.5 minutes, and then the pretreated alkali-resistant glass fiber was added and stirred for 3 minutes. Ordinary Portland cement is used to configure the above-mentioned fiber slurry, which not only meets the requirements for the fiber slurry to penetrate into the cracks of the surrounding rock, but also meets the requirements of economic cost, because the cost of ordinary Portland cement is lower than that of ultra-fine cement.

Ordinary Portland cement and water glass solution comprise water glass, water, and cement, and the mass ratio of described water and cement is 0.8:1, and the volume ratio of cement and water glass is 1:1; Wherein ordinary Portland cement average The particle size is 46um-58um, and the maximum particle size does not exceed 80um; the concentration of water glass is 38Be', and the modulus of water glass is 2.8.

The construction method for fiber grouting reinforcement of roadway surrounding rock with a crack opening of 4mm-5mm is the same as in Example 1.

Example 5:

Surrounding rock with crack opening greater than 5mm.

The length of alkali-resistant glass fiber is 6mm, and the diameter is 20um. The steps of pretreatment of alkali-resistant glass fiber are the same as in Example 1.

The fiber slurry includes ordinary Portland cement, water, water reducing agent and alkali-resistant glass fiber, the mass ratio of the water to ultrafine cement is 1.1:1, and the amount of water reducing agent is 2% of the mass of ordinary Portland cement , the amount of alkali-resistant glass fiber accounts for 2% of the total volume, of which the average particle size of ordinary Portland cement is 56um-68um, and the maximum particle size does not exceed 80um; salt formaldehyde condensate.

During the fiber slurry preparation process, the ordinary portland cement, water and water reducer were mixed and stirred according to the ratio for 1.5 minutes, and then the pretreated alkali-resistant glass fiber was added and stirred for 3 minutes. Ordinary Portland cement is used to configure the above-mentioned fiber slurry, which not only meets the requirements for the fiber slurry to penetrate into the cracks of the surrounding rock, but also meets the requirements of economic cost, because the cost of ordinary Portland cement is lower than that of ultra-fine cement.

Portland cement and water glass solution comprise water glass, water, and cement, and the mass ratio of described water and cement is 0.8:1, and the volume ratio of cement and water glass is 1:1; Wherein ordinary portland cement average particle The particle size is 56um-68um, and the maximum particle size does not exceed 80um; the concentration of water glass is 40Be', and the modulus of water glass is 2.8.

The construction method of fiber grouting reinforcement in roadway surrounding rock with crack opening greater than 5 mm adopts the same steps as in Example 1.

Of course, the above descriptions are only preferred embodiments of the present invention, and the present invention is not limited to the above-mentioned embodiments. It should be noted that all equivalent substitutions made by any person skilled in the art under the guidance of this specification , obvious deformation forms, all fall within the essential scope of this specification, and should be protected by the present invention.

Claims (10)

1. the constructional method of roadway surrounding rock fiber slurry grouting and reinforcing, is characterized in that, adds alkali resistant glass fibre and become fiber slurry in grouting serous fluid, coordinates the constructional method of the grouting and reinforcing of fiber slurry to adopt following steps:

(1) country rock is holed, isolated tube is put into after having holed, ignite the explosive being placed on isolated tube inwall in advance, in isolated tube, place anchor pole afterwards, the effect of isolated tube is that shutoff slurries realize secondary grouting and open fracture opening for explosion providing carrier;

(2) stop-grouting plug is enclosed within anchor pole and isolated tube respectively, makes stop-grouting plug be combined with country rock tighter gap and stop-grouting plug afterbody is installed and form dicyclo stop-grouting plug, then install pallet additional, fastening nut;

(3) carry out once grouting and inject fiber slurry, Grouting Pipe connects isolated tube, and fiber slurry is infiltrated to wall-rock crack by isolated tube;

(4) after once grouting reaches final grouting pressure for some time, secondary grouting is carried out, Grouting Pipe connects anchor pole, silicate cement and water glass slurries are injected by anchor pole, lower tray is unloaded in slip casting process, reach slip casting limit, secondary grouting final pressure back and outwards shift out isolated tube, adjust dicyclo stop-grouting plug after removing isolated tube completely, then install pallet additional, continue slip casting until stop slip casting after again reaching secondary grouting final pressure for some time.

2. the constructional method of roadway surrounding rock fiber slurry grouting and reinforcing according to claim 1, it is characterized in that, described fiber slurry comprises superfine cement, water, water reducer and alkali resistant glass fibre, the mass ratio of described water and superfine cement is 1.2:1-1:1, water reducer volume is the 1%-2% of superfine cement quality, and the volume of alkali resistant glass fibre accounts for the 1%-2% of cumulative volume;

Wherein superfine cement average particle size is 2.8um-3.6um, and maximum particle diameter is no more than 20um; Water reducer adopts Cai's series high-efficiency water-reducing agent.

3. the constructional method of roadway surrounding rock fiber slurry grouting and reinforcing according to claim 1, it is characterized in that, described fiber slurry comprises ordinary Portland cement, water, water reducer and alkali resistant glass fibre, the mass ratio of described water and ordinary Portland cement is 1.2:1-1:1, water reducer volume is the 1%-2% of superfine cement quality, and the volume of alkali resistant glass fibre accounts for the 1%-2% of cumulative volume;

Wherein ordinary Portland cement average particle size is 36um-68um, and maximum particle diameter is no more than 80um; Water reducer adopts Cai's series high-efficiency water-reducing agent.

4. the constructional method of the roadway surrounding rock fiber slurry grouting and reinforcing according to Claims 2 or 3, it is characterized in that, described alkali resistant glass fibre length is 1mm-6mm, diameter is 10um-20um, adopts following steps to carry out pre-treatment to alkali resistant glass fibre:

A. alkali resistant glass fibre is first through 350 DEG C of high-temperature heat treatment 1min;

B. again alkali resistant glass fibre is placed on 20% rare NaOH and rare KOH solution in 100 DEG C heating two hours;

C. with the distilled water cleaning alkali resistant glass fibre 30min of 100 DEG C of flowings.

5. the constructional method of roadway surrounding rock fiber slurry grouting and reinforcing according to claim 4, it is characterized in that, after first superfine cement/ordinary Portland cement and water being pressed proportioning mix and blend 1.5min in described fiber slurry preparation process, then add pretreated alkali resistant glass fibre and stir 3min.

6. the constructional method of roadway surrounding rock fiber slurry grouting and reinforcing according to claim 1, it is characterized in that, in described step (1), isolated tube diameter is greater than bolt diameter and is less than borehole diameter, isolated tube is divided into gas unidirectional valve, the airtight steel pipe layer in inner side, and outer elastic rubber layer, described isolated tube is provided with gas unidirectional valve, externally country rock that can be unidirectional transmits detonation wave, Grouting Pipe is fixed in outer rubber layer, grouting hole is had by isolated tube outer rubber layer, anchor pole is also provided with grouting hole simultaneously, outer rubber layer, and the grouting hole diameter on anchor pole is 30mm.

7. the constructional method of roadway surrounding rock fiber slurry grouting and reinforcing according to claim 6, it is characterized in that, in described step (1), a small amount of Explosive roll is fixed with inside isolated tube, meticulous explosion is by passing to country rock with the outer rubber layer of country rock close contact by vibrations, open fracture opening further, release terrestrial stress.

8. the constructional method of roadway surrounding rock fiber slurry grouting and reinforcing according to claim 1, it is characterized in that, in described step (3), the injection speed of once grouting is 20L/min, final grouting pressure is 1.25MPa, in slip casting process, pressure increases step by step, respectively with 0.5MPa, 0.75MPa, 1MPa, 1.25MPa successively slip casting.

9. the constructional method of roadway surrounding rock fiber slurry grouting and reinforcing according to claim 1, it is characterized in that, described step (4) silicate cement and water glass solution comprise water glass, water and cement, the mass ratio of described water and cement is 0.8:1, and the volume ratio of cement and water glass is 1:1;

Wherein ordinary Portland cement average particle size is 56um-68um, and maximum particle diameter is no more than 80um; The concentration of water glass is 34Be '-40Be ', and modulus of water glass is 2.4-2.8.

10. the constructional method of roadway surrounding rock fiber slurry grouting and reinforcing according to claim 1, it is characterized in that, in described step (4), the injection speed of secondary grouting is 10L/min, final grouting pressure is 1.5MPa, reach slip casting limit, secondary grouting final pressure 1.5MPa back and outwards shift out isolated tube, adjust dicyclo stop-grouting plug after removing completely and install pallet additional, until stop slip casting after again reaching secondary grouting final pressure 1.5MPa.