CN103410564B - A kind of Tunnel Gushing treatment structures and construction method thereof - Google Patents

Abstract

The invention discloses a tunnel water gushing treatment structure and a construction method thereof. In order to solve the problem that the existing tunnel water gushing treatment technology has hidden dangers to tunnel safety, the tunnel water gushing treatment structure includes a guiding water isolating device; the water inlet end of the guiding water isolating device to prevent water flow from spreading is set It is arranged on the inverted arch surface; multiple rows of grouting pipe groups are arranged around the center of the water gushing place, and the length direction of each row of grouting pipe groups is consistent with the direction of the water gushing flow. The invention ensures the stability of the water gushing part of the tunnel and its surrounding surrounding rocks, is easy to construct, has good effect and is low in cost.

Description

A tunnel water gushing treatment structure and its construction method

technical field

The invention relates to a tunnel water gushing treatment structure and a construction method thereof.

Background technique

Tunnel construction is affected by various unfavorable geological disasters, among which water inrush and gushing are frequent problems in tunnel construction in water-rich areas. Long-term water gushing in tunnels will damage the ecological environment, lead to deterioration of construction conditions, threaten tunnel lining safety during operation, and even induce engineering geological disasters. Therefore, it is of practical significance to study tunnel water gushing control.

Traditional tunnel water gushing treatment adopts sealing method and drainage method. Although the traditional sealing method can block the water gushing, the water flow is easy to spread and run around, causing uncontrollable water disasters, and the water gushing is easy to cause fine particles in the surrounding rock of the tunnel to flow out, and the broken surrounding rock structure is partially voided and collapsed. The increase in water pressure will threaten the stability of the lining and affect the safety of the tunnel construction and operation period; the construction resistance of the drainage method waterproof board and the lining reserved drainage pipe is relatively large, and the water gushing will affect the tunnel construction environment and increase the difficulty of construction. Under such circumstances, there is an urgent need for a treatment structure and construction method that can effectively block water and limit the impact of water gushing to a controllable range without affecting the tunnel construction environment.

Contents of the invention

In order to overcome the fact that the existing tunnel water gushing treatment technology cannot control the water flow after the blockage, and then cause uncontrollable water disasters, it is impossible to fundamentally solve the problem of tunnel water gushing, and there are a lot of potential safety hazards; No filtering device is installed at the water head, so that the fine particles in the surrounding rock of the tunnel will flow out, resulting in local voiding and collapse of the broken surrounding rock structure, destroying the support of the side wall, and affecting the stability of the water gushing part and its surroundings of the tunnel. The present invention aims to Provided is a tunnel water gushing treatment structure and a construction method thereof. The water gushing treatment structure can smoothly lead out gushing water and ensure the stability of the tunnel structure.

In order to achieve the above object, the technical solution adopted in the present invention is:

A tunnel water gushing treatment structure, which is characterized in that it includes a guiding water isolating device; the water inlet end of the guiding water isolating device for preventing water flow from spreading is set at the water gushing head of the tunnel, and the water outlet is set on the inverted arch surface; There are multiple rows of grouting pipe groups arranged around the center, and the length direction of each row of grouting pipe groups is consistent with the direction of water inflow.

Following is the further improved technical scheme of the present invention:

In order to prevent the gushing water from taking away the silt at the gushing working face and prevent the gushing working face from collapsing, a filter layer is provided around the water outlet end of the guiding water isolation device.

In order to further improve the connection strength between the grouting pipes and the surrounding rock, each row of grouting pipes includes a plurality of grouting pipes, and each grouting pipe is provided with a grouting hole.

The end of the grouting pipe facing the water gushing head is tapered, which is convenient for the grouting pipe to be inserted into the hole of the grouting pipe.

Further, the water flow guiding water barrier device is a tubular structure with a water passage, such as a culvert.

As a specific structural form, the filter layer is a gravel filter layer.

Another object of the present invention is to provide a construction method for a tunnel water gushing treatment structure as described above, which includes the following steps:

1) Water gushing operation face treatment: clear the broken surrounding rock around the operation face;

2) Isolation of the water gushing head; set the water inlet end of the water flow guiding water isolation device at the position of the gushing water head;

3) Refill gravel; set a filter layer in the circumferential direction of the outlet end of the water flow guiding water isolation device;

4) Close the inverted arch; install the inverted arch and the top support arch in the tunnel and seal them into a ring;

5) Drill multiple grouting pipe holes around the center of the water gushing place, and insert the grouting pipes into the grouting pipe holes.

For the situation where the gushing place is in the weak surrounding rock formation, the grouting pipe is inserted into the hole of the grouting pipe, and then grouted through the grouting hole of the grouting pipe to connect the grouting pipe with the surrounding rock. The slurry injected into the grouting hole is cement water glass double liquid slurry, which can be solidified quickly to realize the reinforcement of the water gushing part of the surrounding rock.

In order to ensure the operation safety of the water gushing work surface and prevent the work face from collapsing due to water seepage, the broken surrounding rock around the working face should be removed. The concrete thickness is at least 10cm.

Before setting the water inlet end of the water flow guiding water isolation device at the position of the water gushing head, pump the accumulated water at the gushing water point until the water gushing head is exposed and the accumulated water in the cave is removed.

The present invention will be further described with a kind of concrete example below:

The tunnel water gushing treatment structure includes a water flow guiding water isolation device and a gravel filtering device arranged at the water gushing place. The water flow guiding water isolation device is to bury the water head with a large culvert and other cylindrical structures to prevent the water flow from spreading around and make the water head pass in our preset direction; the gravel filter is to replace and fill the water flow around the water flow guiding water isolation device. Good crushed stone, etc., filter the sediment to prevent the formation of holes in the surrounding rock of the tunnel and damage the side wall support, and replace the soft foundation at the corner with poured concrete; the initial support of the inverted arch is closed into a ring to control settlement; the arch foot and the bottom of the inverted arch For water gushing and seepage, local radial grouting water blocking treatment is adopted, and multiple rows of grouting pipe groups are arranged circumferentially around the water gushing place and inserted horizontally from the inverted arch surface. Each row of grouting pipe groups includes several grouting pipes , to ensure the stability of the water gushing part of the tunnel and its surrounding surrounding rock.

The feature of the above-mentioned water flow guiding water isolation device of the present invention is that a large cylindrical structure such as a culvert is inserted into the surrounding rock along the direction of the water flow, and the gushing water is placed in the tube so that the water head can only be preset to us through the culvert. passed in the direction. Therefore, the possibility of uncontrollable water catastrophe caused by random diffusion of water flow is prevented.

The filter device of the present invention is characterized in that: the water guides the water-retaining device and replaces it with evenly graded crushed stones in its surroundings, so that the crushed stones can filter out the small surrounding rock particles wrapped in the gushing water, preventing the formation of cavities and damage to the side walls Support, replace the soft foundation at the corner and pour concrete to ensure the stability of the surrounding rock structure of the tunnel.

The characteristics of the above-mentioned reinforcement structure of the present invention are: in the early stage of construction, temporary inverted arches or secondary linings are used to reinforce the surrounding rock of the tunnel at the water gushing place, so as to reduce or prevent the settlement, subsidence or uplift caused by water flow; For water gushing and seepage at the bottom, local radial grouting water blocking treatment is adopted, and multiple rows of grouting pipe groups are arranged circumferentially around the water gushing part and inserted horizontally from the inverted arch surface. Each row of grouting pipe groups includes several grouting pipe groups pipes to ensure the stability of the water gushing part of the tunnel and its surrounding surrounding rock.

Compared with the prior art, the beneficial effect of the present invention is that the present invention can quickly drain water, ensure the stability of the water gushing part of the tunnel and its surrounding surrounding rock, and is easy to construct, with good effect and low cost.

The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a structural principle diagram of an embodiment of the present invention;

Fig. 2 is the right view of Fig. 1;

Fig. 3 is a schematic diagram of the lining reinforcement structure of the present invention.

In the picture

1-Filtration layer; 2-Water gushing; 3-Water flow guiding water-resisting device; 4-Grouting pipe group; 5-Tunnel surrounding rock; 6-Supporting arch; 7-Inverted arch.

detailed description

A tunnel water gushing treatment structure, as shown in Figure 1, Figure 2 and Figure 3, the tunnel is a split tunnel structure, the right line of the tunnel is 1520m long, the left line is 1511.7m long, and the single-hole clearance is 10.25mx5.5m. The gushing water column is jet-shaped, with a diameter of 40~50mm, a length of 4m, a height of 8m, and a flow rate of 55m3/h. The surrounding rock in the gushing operation face is Erlomitic quartz schist interbedded with black cloud chlorite plagioclase, and the rock mass is broken. , with well-developed fissures, which belong to the structure of fault compression zone. Therefore, the culvert pipe 3 is buried at the water head to control the water flow direction, the broken surrounding rock around the culvert pipe is replaced with gravel 2 to filter the sediment, and the soft foundation at the foot of the wall is replaced with poured concrete; Reinforce the lining to prevent invisible damage caused by water gushing; drill and drill 6m-long Φ42×3.5mm steel pipes 4 at the water gushing place 2 at the bottom of the arch foot and the inverted arch, and arrange 8 steel pipes 4 in a circular direction around the water gushing place 2, and arrange three rows vertically , with a spacing of 1.0 meters, a total of 24 are installed, and the cement-sodium silicate double slurry is used for grouting.

The specific operation is as follows:

(1) Treatment of water gushing work surface. In order to prevent the water gushing work surface from collapsing due to water seepage, ensure construction safety, and remove the broken surrounding rock caused by water gushing, if necessary, adopt the anchor net spraying concrete method to seal the water gushing work surface. C20 concrete is sprayed 10cm thick. After reaching 80%, proceed to the next step of construction.

(2) Head isolation. First insert a 5m long Φ150 water pipe at the water head, then use a diesel barrel or culvert pipe 3 to bury the water head, and adjust the water pump to continue pumping;

(3) Replace gravel. Diesel barrels or culvert pipes 3 peripheries are replaced with gravel 2 to filter sediment, and the soft foundation at the foot of the wall is replaced with poured concrete.

(4) Closed inverted arch. The initial support of the construction inverted arch is closed into a ring to control the settlement, and the monitoring and measurement are strengthened to observe the convergence of the settlement and give timely feedback.

(5) Arrangement of grouting pipe group. At the water gushing and seepage places 2 at the arch foot and the bottom of the inverted arch, local radial grouting and water blocking treatment shall be adopted. Drilling and drilling 6m-long Φ42×3.5mm steel pipes 4 are used at each water gushing and seepage place, and 8 steel pipes are arranged in a circular direction around the water gushing place 2, and three rows are arranged vertically with a distance of 1.0 meters. A total of 24 steel pipes are installed, and cement is used for grouting - Double slurry of water glass.

The above-mentioned embodiments should be understood that these embodiments are only used to illustrate the present invention more clearly, and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art will understand the various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

Claims (9)

1. a construction method for Tunnel Gushing treatment structures, is characterized in that, described Tunnel Gushing treatment structures comprises current and guides water barrier device (3); Prevent these current of dispersion of flow from guiding the water inlet end of water barrier device (3) to be arranged on Tunnel Gushing head place, water side is arranged on inverted arch face; Be furnished with many row'ss Grouting Pipe group (4) at hoop centered by water burst place, the length direction often arranging Grouting Pipe group (4) is consistent with water burst water (flow) direction; Described construction method comprises the steps:

1) water burst scope of operation process: remove scope of operation periphery breaking surrounding rock;

2) water burst head isolation; The water inlet end of water barrier device (3) is guided by current to be arranged on water burst head position;

3) change and fill out rubble; Guide the water side circumference of water barrier device (3) that filtration beds (1) is set at current;

4) inverted arch is closed; Inverted arch and end face supporting arch are arranged in tunnel, and close into ring;

5) bore multiple slip casting pore at hoop centered by water burst place, and Grouting Pipe is inserted in slip casting pore.

2. the construction method of Tunnel Gushing treatment structures according to claim 1, is characterized in that, described current guide the water side of water barrier device (3) to be circumferentially with filtration beds (1).

3. the construction method of Tunnel Gushing treatment structures according to claim 1, is characterized in that, often arranges Grouting Pipe group (4) and comprises many Grouting Pipe, every root Grouting Pipe is equipped with injected hole (8).

4. the construction method of Tunnel Gushing treatment structures according to claim 3, is characterized in that, described Grouting Pipe is taper towards one end of water burst head.

5. the construction method of Tunnel Gushing treatment structures according to claim 1, is characterized in that, described current guide water barrier device (3) for having the tubular structure of aquaporin.

6. the construction method of Tunnel Gushing treatment structures according to claim 2, is characterized in that, described filtration beds (1) is rubble filtration beds.

7. according to the construction method of the Tunnel Gushing treatment structures one of claim 1-6 Suo Shu, it is characterized in that, Grouting Pipe is inserted in slip casting pore, then by the injected hole slip casting of Grouting Pipe, Grouting Pipe and country rock is linked together; Slurry to injected hole slip casting is cement-silicate dual slurry.

8. according to the construction method of the Tunnel Gushing treatment structures one of claim 1-6 Suo Shu, it is characterized in that, when breaking surrounding rock is more, then adopt the water burst scope of operation of concrete to country rock to carry out Seal treatment, the concrete thickness of the water burst scope of operation is at least 10cm.

9. the construction method of Tunnel Gushing treatment structures according to claim 7, it is characterized in that, being guided by current before the water inlet end of water barrier device (3) is arranged on water burst head position, extracting water burst place ponding with water pump, until water burst head exposes to the open air, solution cavity internal water accumulation is got rid of.