CN119188968A - A preparation mold and method for rock-concrete composite sample - Google Patents

Abstract

The present invention discloses a preparation mold and method for a rock-concrete composite sample, which belongs to the technical field of sample production, and includes: two identical mold units, respectively denoted as unit A and unit B; an empty slot is provided inside the sample mold, the shape of the empty slot is cylindrical, and the axis of the empty slot is arranged vertically; two hoops are used to make unit A and unit B always assemble into a complete sample mold; a grouting port is opened at the upper end of the sample mold; a grouting pipe, one end of which is installed in the grouting port and the other end is in the concrete slurry; a grouting pump; a grouting valve, which is used to control the opening and closing of the grouting pipe; a slurry outlet, which is used to communicate with the empty slot; a slurry outlet pipe, one end of which is installed in the slurry outlet; a slurry outlet valve, which is used to control the opening and closing of the slurry outlet pipe; and a vibration table, on which a clamping ring is installed, which is adapted to the sample mold and is used to limit the sample mold to the screw on the vibration table. The mold and method can produce rock-concrete composite samples and provide samples for subsequent tests.

Description

Preparation mold and method for rock-concrete combined body sample

Technical Field

The invention belongs to the technical field of sample manufacturing, and particularly relates to a preparation mold and a preparation method of a rock-concrete combined sample.

Background

Some large-scale infrastructures in hydraulic engineering and civil engineering, such as dams, tunnels and the like, are based on natural geologic bodies, and engineering bodies are built on the geologic bodies. Is a combination of a geologic body and an engineering body. These combinations together maintain overall stability when carrying external loads.

The contact surface mechanical properties of the combination are not only related to the mechanical properties of the single body, but also are more of the results of the joint stress, the cooperative deformation and the joint destruction of the whole combination.

At present, a mould and a method for preparing a rock-concrete combined body sample are not available, and the contact surface of the rock and the concrete cannot be made to be at different angles, so that the research on the related technical fields of the combined body is difficult to be effectively and rapidly carried out.

Disclosure of Invention

The invention discloses a preparation mould and a preparation method of a rock-concrete composite sample, which are used for solving the defects.

The invention relates to a preparation mould of a rock-concrete composite sample, which comprises the following components:

The two identical die units are respectively marked as a unit A and a unit B, and the unit A and the unit B can be spliced into a complete sample die, wherein an empty groove is formed in the sample die, the empty groove is cylindrical, and the axis of the empty groove is arranged vertically;

The two hoops are respectively sleeved on the outer walls of the upper end and the lower end of the sample die and are used for enabling the unit A and the unit B to be spliced into a complete sample die all the time;

the grouting port is arranged at the upper end of the sample die and is used for communicating with the empty groove;

one end of the grouting pipe is arranged at the grouting opening through a first fixing buckle and is communicated with the empty slot, and the other end of the grouting pipe is positioned in concrete slurry;

The grouting pump is arranged on the grouting pipe and is used for injecting concrete slurry into the empty groove through the grouting pipe;

the grouting valve is arranged on the grouting pipe and used for controlling the grouting pipe to be opened and closed;

the slurry outlet is formed at the upper end of the sample die and is used for communicating with the empty groove;

one end of the slurry outlet pipe is arranged at the slurry outlet through a second fixing buckle and is communicated with the empty slot, and the other end of the slurry outlet pipe is positioned outside the sample die;

the pulp outlet valve is arranged on the pulp outlet pipe and used for controlling the opening and closing of the pulp outlet pipe;

and a clamping ring is arranged on the table top of the vibration table and is matched with the lower end of the sample die, the clamping ring is sleeved at the lower end of the sample die, and a screw for limiting the sample die on the vibration table is connected to the clamping ring in a threaded manner.

The die can be used for pouring concrete on the basis of the rock core, manufacturing a rock-concrete combined body sample, and manufacturing a proper sample for a subsequent stress test and a triaxial test.

Further, the materials of the unit A and the unit B are organic glass materials.

The glass can help a user to directly observe pouring conditions in the internal empty groove through the glass, and gaps are avoided in the pouring process.

Further, the grouting pipe can be detached from the sample die through the first fixing buckle, and the grouting pipe can be detached from the sample die through the second fixing buckle.

The detachable rubber plug has two advantages, namely, the rubber plug can be arranged at the grouting opening and the grouting opening for water loss during later maintenance. And secondly, the concrete slurry can be injected into the empty groove by using an injector, so that the gap is filled.

The preparation method of the rock-concrete composite sample comprises the following steps:

S1, selecting a complete and defect-free rock block, drilling a rock core of the rock block, and processing the rock core to prepare a cylindrical rock standard sample meeting the requirements, wherein the diameter of the rock standard sample is equal to that of an empty slot;

S2, cutting the rock standard sample into two rock sample halves along the side wall of the rock standard sample, wherein the tangent plane of the rock standard sample is a plane, and the included angle between the tangent plane and the horizontal plane is 0< X <90 degrees;

S3, uniformly coating a release agent on the inner wall of the empty groove to ensure smooth release, putting one rock sample half body into the empty groove to ensure that the tangent plane of the rock sample half body is positioned at the upper end of the rock sample half body;

The unit A and the unit B form a sample mould by using the hoops, so that the sample mould is prevented from loosening, and concrete slurry is prevented from flowing outwards;

S4, respectively connecting a sample mould containing a rock sample half body with a grouting pipe and a grouting pipe by using a first fixing buckle and a second fixing buckle, and waiting for concrete slurry to be poured;

S5, preparing concrete slurry according to requirements;

S6, sequentially opening a grouting valve, a grouting valve and a grouting pump, observing one end of the grouting pipe far away from the sample mold, and sequentially closing the grouting pump, the grouting valve and the grouting valve if concrete slurry flows out of the end of the grouting pipe;

s7, starting a vibrating table, wherein the vibrating time is T, observing whether the area except the rock sample half body in the empty groove is filled with concrete or not, if a gap appears, disassembling a grouting pipe at the first fixing buckle or a grouting pipe at the second fixing buckle, extending into the empty groove through a grouting port or a grouting port by using an injector, filling the gap with concrete slurry by using the injector, and then starting the vibrating table again for T until the area except the rock sample half body in the empty groove is free of gaps;

S8, taking down a sample mould containing a rock-concrete combination body from a vibrating table, respectively disassembling a grouting pipe and a grouting pipe from a first fixing buckle and a second fixing buckle, sealing a grouting port and a grouting port by using a rubber plug, and preventing water loss in the initial setting process of a concrete sample;

s9, after the casting of the rock-concrete combination body is completed 24h, the combination body is disassembled, numbered and maintained according to the requirement after the die is disassembled;

s10, repeating S1-S9, changing the included angle X, and preparing a plurality of rock-concrete assemblies with different included angles.

The method comprises the steps of weighing yellow sand, pouring the weighed yellow sand into a stirrer, dry-mixing for 45 seconds, pouring the weighed silica fume into the stirrer, dry-mixing for 45 seconds, pouring the weighed cement into the stirrer, stirring for 45 seconds, stopping, pouring the water solution containing the water reducer into the stirrer, stirring for 60 seconds, stopping, scraping concrete attached to the inner wall of the stirrer into a cavity of the stirrer, scraping concrete attached to a stirring rod of the stirrer into the cavity of the stirrer, and starting the stirrer again for 60 seconds after no concrete is attached to the inner wall of the stirrer and the surface of the stirring rod, so that stirring of concrete slurry is completed.

Further, in the step S9, the curing condition is that the temperature is 20 ℃ plus or minus 2 ℃ and the relative humidity is more than 95%, and the curing time is 28 days.

Further, in the step S5, the mass ratio of cement, yellow sand, water, a water reducing agent and silica fume is 1:0.5:0.25:0.01:0.08, and the stirring speed of the stirrer is 10-15PRM.

Further, in step S7, the vibration time T is 60 seconds.

Further, in step S9, the period of time M is 24 hours.

Advantageous effects

The preparation mold and the preparation method can be used for preparing rock-concrete composite samples, and can change the angle of the included angle X to prepare rock-concrete composite samples with different included angles.

Drawings

Fig. 1 is a schematic structural view of a unit a and a unit B;

fig. 2 is a schematic view of the structure of the inside of the specimen mold.

Fig. 3 is a schematic structural view of a rock-concrete composite sample.

1. Unit A, unit B, unit 3, empty slot, 4, hoop, 5, first fixing buckle, 6, grouting pipe, 7, grouting pump, 8, grouting valve, 9, grouting pipe, 10, grouting valve, 11, vibrating table, 12, clasp;

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1A preparation mould for a rock-concrete composite sample, comprising:

Two identical mold units, designated as unit A1 and unit B2, respectively. In this embodiment, the materials of the unit A1 and the unit B2 are all plexiglas. The unit A1 and the unit B2 can be spliced into a complete sample mold, the sample mold is rectangular, in this embodiment, the specification of the sample mold is 75×75×140mm (length×width×height), wherein in this embodiment, the left-right direction in fig. 1 is long, the vertical direction is high, the paper surface direction is wide, a cylindrical empty groove 3 is arranged in the sample mold, an operator can observe the empty groove 3 through the sample mold, in this embodiment, the specification of the empty groove 3 is 50×100 (diameter×height), the axis of the empty groove 3 is vertically arranged, the splicing surfaces of the unit A1 and the unit B2 are vertically arranged, and the empty groove 3 is equally divided into two parts by the splicing surfaces.

And the two hoops 4 are respectively sleeved on the outer walls of the upper end and the lower end of the sample die and used for hooping the unit A1 and the unit B2, so that the unit A1 and the unit B2 are not loose as a whole and are spliced into a complete sample die all the time.

The grouting opening is shown in fig. 2, is arranged at the upper end of the sample die and is communicated with the internal empty slot 3 of the sample die, and is provided with a first fixing buckle 5;

one end of the grouting pipe 6 is communicated with the inner empty groove 3 of the sample mould through a grouting opening, and the end of the grouting pipe 6 is arranged on the sample mould through a first fixing buckle 5. The other end of the grouting pipe 6 is in the concrete slurry.

A grouting pump 7 mounted on the grouting pipe 6 for injecting concrete slurry into the empty slot 3 through the grouting pipe 6;

the grouting valve 8 is arranged on the grouting pipe 6 and is used for controlling the grouting pipe 6 to open and close.

The slurry outlet is formed at the upper end of the sample die and is communicated with the internal empty slot 3 of the sample die, and a second fixing buckle is arranged at the slurry outlet;

one end of the slurry outlet pipe 9 is communicated with the inner empty groove 3 of the sample mold through a slurry outlet, the end of the slurry outlet pipe 9 is arranged on the sample mold through a second fixing buckle, and the other end of the slurry outlet pipe is communicated with the outside of the sample mold.

The pulp outlet valve 10 is arranged on the pulp outlet pipe 9 and is used for controlling the opening and closing of the pulp outlet pipe 9.

The vibration table 11 is provided with a clamping ring 12 for placing the lower end of the sample die on the table surface, the clamping ring 12 is matched with the shape of the lower end of the sample die, the clamping ring 12 is sleeved at the lower end of the sample die, the clamping ring 12 is connected with a screw in a threaded manner, the axis of the screw is horizontally arranged, and the screw can be abutted to the outer wall of the sample die through screwing. The screw is screwed to make the screw contact with the outer wall of the sample mold, and the sample mold is limited by the screw, so that the sample mold is prevented from being separated from the vibration table 11 when the vibration table 11 vibrates.

Example 2a method of preparing a rock-concrete composite sample comprising the steps of:

S1, selecting a complete and defect-free rock block, drilling a rock core of the rock block by using a coring machine, and processing the rock core to prepare a cylindrical rock standard sample meeting the requirements, wherein the complete and defect-free meaning is that the inside of the rock block has no obvious fracture fault and is not obvious to be interpreted as being not easy to be perceived by human eyes.

In this example, the standard rock sample is 50×100mm (diameter×high), and the diameter of the standard rock sample is equal to the diameter of the empty groove.

S2, cutting the rock standard sample into two rock sample halves along the side wall of the rock standard sample by an infrared rock cutting machine, wherein the tangent plane of the rock standard sample is a plane, and if the included angle between the tangent plane and the horizontal plane is X, 0< X <90 degrees, the tangent plane is ensured to be non-horizontal plane and non-vertical plane. Along the side of the rock standard sample means that the start point and the end point of the cut are both located at the side wall of the rock standard sample.

S3, uniformly coating a release agent on the inner wall of the empty groove to ensure that the later-stage smooth release is ensured, and after the release agent is coated, placing one rock sample half body formed by cutting into the empty groove to ensure that the section of the rock sample half body is positioned at the upper end of the rock sample half body, namely as shown in figure 2;

The unit A and the unit B form a sample mould by using a hoop, the outer wall of the rock sample half body is attached to the inner wall of the sample mould, and the hoop is sleeved to ensure that the sample mould is not loose and the concrete slurry does not flow outwards.

S4, connecting a sample mould containing a rock sample half body with a grouting pipe and a grouting pipe by using a first fixing buckle and a second fixing buckle respectively, and waiting for concrete slurry to be poured;

S5, preparing concrete slurry. Pouring the weighed yellow sand into a stirrer, stopping after dry stirring for 45 seconds, pouring the weighed silica fume into the stirrer, stopping after dry stirring for 45 seconds again, pouring the weighed cement into the stirrer, stopping after continuous dry stirring for 45 seconds, pouring the water solution containing the water reducer into the stirrer, stopping after stirring for 60 seconds, scraping the concrete attached to the inner wall of the stirrer into a cavity of the stirrer, and scraping the concrete attached to a stirring rod of the stirrer into the cavity of the stirrer at the same time, so as to ensure that the stirring of the concrete slurry is completed after the inner wall of the stirrer and the concrete attached to the surface of the stirring rod are not adhered, and starting the stirrer again for 60 seconds. In this embodiment, the water reducing agent is a polycarboxylic acid. The stirring speed of the stirrer is 10-15PRM. The amounts and mass ratios of the materials in S5 are shown in Table 1.

TABLE 1 amounts and mass ratios of the respective materials

Material	52.5 Cement	Yellow sand	Water and its preparation method	Water reducing agent	Silica fume
						Dosage/g	300	150	75	3	24
Mass ratio	1	0.5	0.25	0.01	0.08

S6, sequentially opening a grouting valve, a grouting valve and a grouting pump, observing one end of the grouting pipe far away from the sample die by a person, and sequentially closing the grouting pump, the grouting valve and the grouting valve if concrete slurry flows out of the end of the grouting pipe;

S7, starting the vibration table, vibrating for 60 seconds, observing whether the area except the rock sample half body in the empty groove is filled with concrete, if a gap exists, disassembling the grouting pipe at the first fixing buckle or the grouting pipe at the second fixing buckle, extending into the empty groove through the grouting opening or the grouting opening by using a syringe, filling the gap with concrete slurry, and then starting the vibration table for 60 seconds again until the area except the rock sample half body in the empty groove is free of gaps.

S8, taking down a sample mould containing the rock-concrete combination body from the vibration table, respectively disassembling the grouting pipe and the grouting pipe from the first fixing buckle and the second fixing buckle, sealing the grouting port and the grouting port by using rubber plugs, and preventing water loss in the initial setting process of the concrete sample.

S9, after the casting of the rock-concrete combination body is completed by 24 h, the combination body is subjected to die stripping treatment, the combination body after die stripping is numbered, and the combination body after the number is placed into a curing box for curing for 28 days, wherein the curing conditions are that the temperature is 20 ℃ plus or minus 2 ℃ and the relative humidity is more than 95 percent. Excess concrete was cut and the cured assembly was cut into standard samples, which were cylindrical in shape and 50 x 100mm (diameter x high) in size, as shown in fig. 3.

S10, repeating S1-S9, changing the included angle X, and preparing a plurality of rock-concrete assemblies with different included angles.

With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (9)

1. A mold for preparing a rock-concrete composite sample, characterized by comprising: Two identical mold units are respectively denoted as unit A and unit B, and unit A and unit B can be assembled into a complete sample mold; a hollow groove is provided inside the sample mold, and the hollow groove is cylindrical in shape, and the axis of the hollow groove is arranged vertically; the joint surface of unit A and unit B is arranged vertically, and the hollow groove is equally divided into two parts; Two hoops are respectively mounted on the upper and lower outer walls of the sample mold to ensure that unit A and unit B are always assembled into a complete sample mold; A grouting port is provided at the upper end of the sample mold and is used to communicate with the empty slot; A grouting pipe, one end of which is installed at the grouting port through a first fixing buckle and communicated with the empty groove, and the other end of which is in the concrete slurry; A grouting pump, installed on the grouting pipe, used to inject concrete slurry into the empty groove through the grouting pipe; Grouting valve, installed on the grouting pipe, used to control the opening and closing of the grouting pipe; A slurry outlet is provided at the upper end of the sample mold and is used to communicate with the empty slot; A slurry outlet pipe, one end of which is installed at the slurry outlet through a second fixing buckle and communicated with the empty slot, and the other end of which is outside the sample mold; The slurry discharge valve is installed on the slurry discharge pipe to control the opening and closing of the slurry discharge pipe; The vibration table has a clamping ring installed on its table top, which is adapted to the lower end of the sample mold. The clamping ring is sleeved on the lower end of the sample mold, and a screw for limiting the sample mold on the vibration table is threadedly connected on the clamping ring. 2. A mold for preparing a rock-concrete assembly sample according to claim 1, characterized in that the material of unit A and unit B is organic glass. 3. A rock-concrete composite sample preparation mold according to claim 2, characterized in that the grouting pipe can be removed from the sample mold through a first fixing buckle; the slurry outlet pipe can be removed from the sample mold through a second fixing buckle. 4. A method for preparing a rock-concrete composite sample, based on the mold for preparing a rock-concrete composite sample according to claim 3, characterized in that it comprises the following steps: S1: Select a complete and defect-free rock block, drill the core of the rock block, process the core, and prepare it into a cylindrical rock standard sample that meets the requirements; the diameter of the rock standard sample is equal to the diameter of the empty slot; complete and defect-free means that there are no cracks or faults inside the rock block; S2: Cut the standard rock sample into two halves along the side wall of the standard rock sample; the section of the standard rock sample is a plane; let the angle between the section and the horizontal plane be X, then 0<X<90 degrees; along the side wall of the standard rock sample: the starting point and the end point of the section are both located on the side wall of the standard rock sample; S3: evenly apply a release agent on the inner wall of the empty groove to ensure smooth demoulding; place one of the rock sample halves into the empty groove to ensure that the cut surface of the rock sample half is at the upper end of the rock sample half; Unit A and unit B use hoops to form a sample mold to ensure that the sample mold is not loose and the concrete slurry does not flow out; S4: using the first fixing buckle and the second fixing buckle respectively, the sample mold containing the half body of the rock sample is connected to the grouting pipe and the grouting pipe respectively, waiting for the concrete slurry to be poured; S5: Prepare concrete slurry as required; S6: Open the grouting valve, the slurry outlet valve and the grouting pump in sequence, and observe the end of the slurry outlet pipe away from the sample mold. If concrete slurry flows out of the end of the slurry outlet pipe, close the grouting pump, the slurry outlet valve and the grouting valve in sequence; S7: Turn on the vibration table for a vibration time of T; observe whether the area in the empty slot except the half of the rock sample is filled with concrete; if there is a gap, remove the grouting pipe at the first fixing buckle or the slurry outlet pipe at the second fixing buckle, and use a syringe to extend into the empty slot through the grouting port or the slurry outlet, and use the syringe to fill the gap with concrete slurry; then, turn on the vibration table again for a time of T until there is no gap in the area in the empty slot except the half of the rock sample; S8: Remove the sample mold containing the rock-concrete assembly from the vibration table; remove the grouting pipe and the grouting pipe from the first fixing buckle and the second fixing buckle respectively; seal the grouting port and the grouting port with rubber plugs to prevent water loss during the initial setting process of the concrete sample; S9: After the rock-concrete assembly is poured for a period of time M, the assembly is demolded, numbered and cured as required; after curing, the excess concrete is cut and the cured assembly is cut into standard specimens; S10: Repeat S1-S9, change the angle X, and prepare multiple rock-concrete assemblies with different angles. 5. The method for preparing a rock-concrete assembly sample according to claim 4 is characterized in that, in step S5, the weighed yellow sand is poured into the mixer, and the mixer is dry mixed for 45 seconds and then stopped; the weighed silica fume is poured into the mixer, and the dry mixing is stopped again for 45 seconds; then, the weighed cement is poured into the mixer, and the stirring is stopped after 45 seconds; the aqueous solution containing the water reducer is poured into the mixer, and the stirring is stopped after 60 seconds, and the concrete attached to the inner wall of the mixer is scraped off into the cavity of the mixer, and the concrete attached to the stirring rod of the mixer is scraped off into the cavity of the mixer, and after ensuring that there is no concrete attached to the inner wall of the mixer and the surface of the stirring rod, the mixer is turned on again for stirring for 60 seconds to complete the stirring of the concrete slurry. 6. The method for preparing a rock-concrete assembly sample according to claim 4 is characterized in that, in step S9, the curing conditions are: temperature 20°C ± 2°C, relative humidity greater than 95%; and curing time is: 28 days. 7. The method for preparing a rock-concrete assembly sample according to claim 5, characterized in that in step S5, the mass ratio of cement, yellow sand, water, water reducing agent and silica fume is 1:0.5:0.25:0.01:0.08; and the stirring speed of the mixer is 10-15PRM. 8. The method for preparing a rock-concrete assembly sample according to claim 4, characterized in that in step S7, the vibration time T is 60 seconds. 9. The method for preparing a rock-concrete assembly sample according to claim 4, characterized in that in step S9, the period of time M is 24 hours.