Moving water anti-dispersing grouting test system, method and moving water anti-dispersing grouting slurry

Abstract

The present invention provides a hydrodynamic anti-dispersion grouting test system, method and hydrodynamic anti-dispersion grouting slurry. The system includes a support frame, on which a test tank, a constant-pressure filter screen cylinder and a constant-pressure water cylinder are arranged. A water outlet pipe is arranged at the bottom of the test tank, a grouting cylinder is arranged in the test tank, and an air temperature-adjusting pipe and an air temperature controller are arranged below the test tank. The slurry consists of: sulfoaluminate cement, mineral powder, steel slag powder, fly ash, bentonite, hydroxypropyl methyl cellulose ether, redispersible latex powder, cement dispersant, citric acid, lithium carbonate, calcium formate and water. The method uses the hydrodynamic anti-dispersion grouting test system to test the performance of the slurry. In the present invention, the hydrodynamic anti-dispersion grouting test system can meet the test requirements of hydrodynamic conditions at different temperatures, the hydrodynamic anti-dispersion grouting test method can quantitatively analyze the diffusion situation and plugging effect of the grouting material, and the hydrodynamic anti-dispersion grouting slurry has good diffusion effect and plugging effect.

Description

Technical Field

[0001] The invention belongs to the technical field of grouting materials, relates to dynamic water grouting materials, and specifically relates to a dynamic water anti-dispersion grouting test system, method and dynamic water anti-dispersion grouting slurry. Background Art

[0002] Coal mining is often accompanied by unexpected disasters. The factors that cause unexpected disasters include water, fire, gas, rock burst and coal dust. Among them, floods have become one of the unexpected disasters that seriously restrict the sustainable development of the coal industry and cause major economic losses and casualties. When a sudden (seepage) water disaster occurs in a coal mine, the source of the sudden water and the sudden (conducting) water channel can be identified through technical means such as geophysical exploration, chemical exploration and drilling, and the water channel can be blocked by underground and ground grouting technology, and emergency rescue and drainage can be initiated, so as to achieve emergency rescue and drainage and mine restoration in case of flood accidents.

[0003] Existing grouting technologies can be classified into static water grouting and dynamic water grouting according to the water flow state. Dynamic water grouting has higher technical difficulty and risk due to the abundant water source reserves at the water outlet, high head pressure, and water flow replenishment along a certain channel, but it has the advantages of shorter construction period and less investment compared with static water grouting. Most of the existing dynamic water grouting materials are mixed with water glass, polyurethane and organic materials, and have the following defects: the setting time of cement-water glass slurry is difficult to control; polyurethane slurry is toxic; organic material consolidation is easy to age; when using cement clinker, it is difficult to select raw materials and the materials are not easy to obtain; multi-component slurry is difficult to construct on site, and the slurry is unevenly mixed, resulting in poor diffusion effect and weak blocking effect.

[0004] In order to ensure that the grouting material has a good sealing effect in actual use, it is necessary to test the performance of the grouting material. However, when conducting dynamic water grouting tests, the influence of formation water temperature under dynamic water conditions is not taken into account, resulting in the prepared dynamic water grouting material being unable to adapt to working conditions under multiple temperature conditions. Summary of the invention

[0005] In view of the defects and shortcomings of the prior art, one of the objects of the present invention is to provide a dynamic water anti-dispersion grouting test system and method to solve the technical problem that the prior art does not take into account the influence of formation water temperature under dynamic water conditions, resulting in the inability of dynamic water grouting materials to adapt to working conditions under multiple temperature conditions.

[0006] In view of the defects and shortcomings of the prior art, another object of the present invention is to provide a dynamic water anti-dispersion grouting slurry to solve the technical problem that the diffusion effect and the blocking effect of the dynamic water grouting slurry in the prior art need to be further improved.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0008] A dynamic water anti-dispersion grouting test system comprises a support frame, wherein the support frame comprises a support top plate, and a plurality of support legs are fixedly arranged on the bottom surface of the support top plate; a test trough is arranged horizontally on the support top plate, a pressure-stabilizing filter screen cylinder is arranged vertically on the support top plate on one horizontal side of the test trough, and a pressure-stabilizing water cylinder is integrated at the top of the pressure-stabilizing filter screen cylinder; a water outlet pipe is arranged at the bottom on the other horizontal side of the test trough, and a grouting cylinder is arranged vertically in the test trough.

[0009] The test tank includes an outer insulation shell arranged on the top surface of the supporting top plate, an inner test tank is arranged inside the outer insulation shell, and the space between the outer insulation shell and the inner test tank is a temperature control chamber; the top end of the inner test tank is open and the bottom end is closed, a movable cover plate is arranged in the inner test tank along the horizontal direction, and the space between the inner test tank and the movable cover plate is a dynamic water test chamber.

[0010] An air temperature regulating pipe is arranged on the bottom surface of the outer heat-insulating shell, the air outlet end of the air temperature regulating pipe is connected with the temperature control chamber, and the air inlet end of the air temperature regulating pipe is connected with the air temperature controller.

[0011] The water inlet end of the pressure-stabilizing water cylinder is connected to the water outlet end of the water injection device, the water outlet end of the pressure-stabilizing water cylinder is connected to the water inlet end of the pressure-stabilizing filter cylinder, the water outlet end of the pressure-stabilizing filter cylinder is connected to the water inlet end of the dynamic water test chamber, and the water outlet end of the dynamic water test chamber is connected to the water outlet pipe; the slurry inlet end of the grouting cylinder is connected to the slurry outlet end of the grouting device, the slurry outlet end of the grouting cylinder is connected to the slurry inlet end of the dynamic water test chamber, and the slurry outlet end of the dynamic water test chamber is connected to the water outlet pipe.

[0012] The present invention also has the following technical features:

[0013] A plurality of flow velocity-pressure sensors are arranged on the bottom surface of the inner test tank. The plurality of flow velocity-pressure sensors are evenly arranged with equal horizontal spacing and equal vertical spacing. The sensor matrix composed of the plurality of flow velocity-pressure sensors includes a plurality of square grid units.

[0014] A longitudinal pressure plate and a transverse pressure plate are fixedly arranged on the top surface of the movable cover plate in sequence, the top ends of the transverse pressure plates are detachably mounted with the tops of the adjusting bolts, and the bottoms of the adjusting bolts are detachably mounted on the bottom surface of the inner test groove; the top ends of a pair of compression springs are fixedly arranged on the bottom surface of the movable cover plate, the bottom ends of a pair of compression springs are fixedly arranged on the bottom surface of the inner test groove, the pair of compression springs are located on the transverse inner side of the adjusting bolts, and sealing tape is wrapped around the compression springs.

[0015] The water injection device comprises a water injection pipe whose water outlet end is connected to a pressure-stabilizing water cylinder, whose water inlet end is connected to a water tank, and a water injection pump, a water injection pump control valve and a water inlet temperature controller are sequentially arranged on the water injection pipe.

[0016] The grouting device comprises a grouting pipe whose slurry outlet end is connected to a grouting tube, whose slurry inlet end is connected to a slurry making barrel, and a grouting pump and a grouting pump control valve are sequentially arranged on the grouting pipe.

[0017] The present invention also protects a dynamic water anti-dispersion grouting test method, which uses the dynamic water anti-dispersion grouting test system as described in any one of claims 1 to 5 to perform a performance test on the grouting slurry; the method specifically comprises the following steps:

[0018] Step 1: Adjust the flow rate of water to the flow rate required for the test, and adjust the temperature of water to the temperature required for the test;

[0019] Step 2. After completing the temperature and flow rate adjustment of the water in step 1, use the water injection device to transport the water to the pressure-stabilizing water cylinder, adjust the water pressure in the pressure-stabilizing water cylinder to the water pressure required for the test, and the water in the pressure-stabilizing water cylinder forms a stable and uniform water flow after passing through the pressure-stabilizing filter cylinder, which is transported to the dynamic water test chamber to simulate the dynamic water environment required for the test.

[0020] Step three, start the air temperature controller to adjust the air to the temperature required for the test, and then transport the temperature-adjusted air to the temperature control chamber through the air temperature control pipe, so that the temperature of the dynamic water test chamber is kept constant through the temperature control chamber.

[0021] Step 4: Use a grouting device to send the grouting slurry into the dynamic water test chamber. After the grouting slurry enters the dynamic water test chamber, it diffuses in the simulated dynamic water environment.

[0022] Step five, record the data of the slurry diffusion process in the dynamic water test chamber, and calculate and obtain the slurry retention rate based on the recorded data.

[0023] Specifically, in step 5, the calculation process of the slurry retention rate is as follows:

[0024] Step 5.1, using formula I to calculate the slurry retention volume, the formula I is:

[0025] V=∫nS x S y (P 泵 +P 稳 -P) / ρ 水 g Formula I;

[0026] Where:

[0027] V represents the slurry retention volume, in m 3 ;

[0028] n represents the number of grid cells in the sensor matrix;

[0029] S xIndicates the longitudinal spacing between adjacent flow velocity-pressure sensors, in m;

[0030] S y Indicates the lateral spacing between adjacent flow velocity-pressure sensors, in m;

[0031] P 泵 Indicates the water head pressure output by the water injection pump, in MPa;

[0032] P 稳 Indicates the water head pressure in the dynamic water test chamber, in MPa;

[0033] P represents the head pressure monitored by a flow rate-pressure sensor, in MPa;

[0034] ρ 水 Indicates the density of water in kg / m 3 ;

[0035] g means severe.

[0036] Step 5.2, the slurry retention volume obtained in step 5.1 is substituted into formula II to calculate and obtain the slurry retention mass, wherein formula II is:

[0037] M=ρ 浆 V-form II;

[0038] Where:

[0039] M represents the retained mass of slurry, in kg;

[0040] P 泵 Indicates the water head pressure output by the water injection pump, in MPa;

[0041] V represents the slurry retention volume, in m 3 .

[0042] Step 5.3, the slurry retention mass obtained in step 5.2 is substituted into formula III to calculate and obtain the slurry retention rate, wherein formula III is:

[0043]

[0044] Where:

[0045] β represents the slurry retention rate;

[0046] M represents the retained mass of slurry, in kg;

[0047] M 注 It indicates the mass of slurry injected into the dynamic water test chamber, in kg;

[0048] Q represents the flow rate of slurry, in m 3 ;

[0049] ρ 浆 Indicates the density of the slurry in kg / m 3 .

[0050] Specifically, in step 5.1, the water head pressure in the dynamic water test chamber is calculated using the following formula IV:

[0051] P 稳 =P 泵 +ρ 水 HkDJ 稳 Formula IV;

[0052] Where:

[0053] P 稳 Indicates the water head pressure in the dynamic water test chamber, in MPa;

[0054] P 泵 Indicates the water head pressure output by the water injection pump, in MPa;

[0055] ρ 水 Indicates the density of water in kg / m 3 ;

[0056] g means severe;

[0057] H 稳 It indicates the distance between the movable cover and the bottom surface of the inner test tank, in m.

[0058] Specifically, the grouting slurry is a dynamic water-resistant dispersion grouting slurry, which is composed of the following raw materials in parts by mass: 22 to 40 parts of sulphoaluminate cement, 4 to 10 parts of mineral powder, 3 to 8 parts of steel slag powder, 8 to 25 parts of fly ash, 1 to 3 parts of bentonite, 0.02 to 0.05 parts of hydroxypropyl methyl cellulose ether, 0.02 to 0.05 parts of redispersible latex powder, 0.1 to 0.4 parts of cement dispersant, 0.007 to 0.07 parts of citric acid, 0.02 to 1.0 parts of lithium carbonate, 0.03 to 2.0 parts of calcium formate, and 20 to 40 parts of water, and the sum of the raw materials' parts by mass is 100 parts.

[0059] The present invention also protects a water-dynamic anti-dispersion grouting slurry as described above.

[0060] Compared with the prior art, the present invention has the following beneficial technical effects:

[0061] (I) The dynamic water anti-dispersion grouting test system of the present invention can simulate sudden (water gushing) environmental conditions of different temperature environments and different water pressure and flow rates. The water injection temperature during the test process is controllable, the test environment temperature is controllable, the head pressure and flow rate are adjustable, the test results are accurate, and the monitoring process parameters are precise, which can meet the dynamic water condition test requirements at different temperatures.

[0062] (II) The dynamic water anti-dispersion grouting test method of the present invention can quantitatively analyze the diffusion of the grouting material and the blocking effect based on various data during the slurry diffusion process and the calculated slurry retention rate.

[0063] (III) The dynamic water anti-dispersion grouting slurry of the present invention has a wide range of raw materials and is non-toxic, has a simple preparation method, is easy to transport and construct, and has good diffusion and blocking effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a schematic diagram of the overall structure of the dynamic water anti-dispersion grouting test system.

[0065] Figure 2 Schematic diagram of the test tank structure.

[0066] Figure 3 The line graph shows the relationship between different dynamic water flow rates and slurry retention rate at an ambient temperature of 20°C.

[0067] Figure 4 The line graph shows the relationship between different dynamic water flow rates and slurry retention rate at an ambient temperature of 10°C.

[0068] Figure 5 The line graph shows the relationship between different dynamic water flow rates and slurry retention rate at an ambient temperature of 5°C.

[0069] The meanings of the numbers in the figure are: 1-support frame, 2-test tank, 3-pressure-stabilizing filter cylinder, 4-pressure-stabilizing water cylinder, 5-water outlet pipe, 6-grouting cylinder, 7-air temperature regulating pipe, 8-air temperature controller, 9-water injection device, 10-grouting device, 11-flow rate-pressure sensor, 12-waste liquid collection bucket;

[0070] 101-supporting top plate, 102-supporting legs;

[0071] 201-external insulation shell, 202-inner test tank, 203-temperature control chamber, 204-movable cover plate, 205-dynamic water test chamber, 206-longitudinal pressure plate, 207-transverse pressure plate, 208-adjusting bolt, 209-compression spring, 210-sealing tape;

[0072] 801-water injection pipe, 802-water tank, 803-water injection pump, 804-water injection pump control valve, 805-water inlet temperature controller;

[0073] 901-grouting pipe, 902-slurry barrel, 903-grouting pump, 904-grouting pump control valve;

[0074] S1-Example 1, D1-Comparative Example 1, D2-Comparative Example 2, D3-Comparative Example 3, D4-Comparative Example 4.

[0075] The technical solution of the present invention is further described below in conjunction with embodiments. DETAILED DESCRIPTION

[0076] In the present invention:

[0077] The gravity g refers to the gravity acting on a unit volume of water, and the gravity g is 9.8kN / m 3 .

[0078] It should be noted that all parts, instruments and raw materials used in the present invention, unless otherwise specified, are parts and instruments known in the art, such as:

[0079] The sulphoaluminate cement adopts 42.5 grade sulphoaluminate cement known in the prior art.

[0080] The mineral powder adopts S95 mineral powder known in the prior art.

[0081] The steel slag powder adopts the steel slag powder with a particle size less than 200 mesh known in the prior art.

[0082] The fly ash adopts the secondary fly ash known in the prior art.

[0083] The dispersible latex powder adopts the dispersible latex powder known in the prior art, which is a water-soluble white or off-white flowable powder, a copolymer of ethylene and vinyl acetate, and uses polyvinyl alcohol as a protective colloid.

[0084] The cement dispersant adopts the ether polycarboxylic acid high performance water reducing agent known in the prior art.

[0085] In accordance with the above technical scheme, specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of this application fall within the protection scope of the present invention.

[0086] In this embodiment, the grouting pump 903 adopts a grouting pump known in the prior art, and a pump pressure gauge and a pump flow meter are provided on the grouting pump 903. The pump pressure gauge is used to record the slurry pressure output by the grouting pump, and the pump flow meter is used to record the flow rate of the slurry.

[0087] Embodiment 1:

[0088] The present embodiment provides a dynamic water-resistant dispersion grouting slurry, which is composed of the following raw materials in parts by mass: 35 parts of sulphoaluminate cement, 5 parts of mineral powder, 4.17 parts of steel slag powder, 20 parts of fly ash, 0.5 parts of bentonite, 0.025 parts of hydroxypropyl methylcellulose ether, 0.025 parts of redispersible latex powder, 0.2 parts of cement dispersant, 0.03 parts of citric acid, 0.5 parts of lithium carbonate, 0.05 parts of calcium formate, and 34 parts of water.

[0089] In this embodiment, the working principle of each component of the dynamic water anti-dispersion grouting slurry is as follows:

[0090] Cement undergoes a hydration reaction when it comes into contact with water, generating cement stone with a dense structure, which improves the anti-dispersion and anti-permeability properties of the grouting material.

[0091] Mineral powder can shorten the setting time of cement paste, fill the voids of hydration products, reduce the total porosity of the system, and improve the strength and density of cement slurry stone body.

[0092] Steel slag powder can increase the density of the grouting slurry, and its mineral component tricalcium silicate can also participate in the hydration reaction, thereby improving the later strength of the grouting material and compensating for the strength reduction of the cement slurry.

[0093] Fly ash has volcanic ash activity and can undergo hydration reaction, making the microstructure of the cement slurry stone body denser, shortening the setting time of the grouting material, and improving the strength of the slurry stone body.

[0094] Bentonite improves the stability of grouting materials by absorbing a large amount of free water in the slurry, thereby reducing the fluidity of the material. At the same time, bentonite fills the pores between the particle skeletons in the cement slurry to form a dense stone body, thereby improving the anti-seepage performance.

[0095] Hydroxypropyl methylcellulose ether can form a large number of pores, which can absorb moisture in the slurry, increase the viscosity of the grouting material slurry, enhance the adsorption of cement particles, reduce the water freedom between the flocculation structure, and improve the water retention rate and consistency of the grouting material.

[0096] Dispersible latex has an extremely outstanding waterproof function, which can increase the cohesion inside the slurry and improve the workability of the slurry.

[0097] Cement dispersant has a very high water-reducing effect, which can reduce water consumption, lower the water-cement ratio, increase the cohesion of the slurry, promote structural density, and enable the slurry to maintain good plasticity and fluidity.

[0098] Citric acid can enter the gaps between cement particles, blocking the continuity of cement hydration and delaying the hydration and coagulation time.

[0099] Lithium carbonate can accelerate the consumption of the hydration product anhydrous calcium sulphoaluminate, shorten the hydration induction period, reduce the setting time of cement slurry, and accelerate the formation and increase of the hydration product ettringite.

[0100] Calcium formate can accelerate the hydration of cement, improve the early strength of dry-mix mortar, and also has a water-reducing effect. It also has a certain degree of antifreeze properties at low temperatures.

[0101] The above components work synergistically to improve the dynamic water scour resistance of the dynamic water anti-dispersion grouting slurry.

[0102] In this embodiment, the preparation method of the dynamic water anti-dispersion grouting slurry is as follows:

[0103] First, the weighed components are added into a spiral stirring device and stirred evenly to obtain a powder grouting material; the stirring time is at least 3 minutes; the obtained powder grouting material is bagged or canned, sealed to ensure that it is isolated from air and water, and then the sealed powder grouting material is transported to the construction site.

[0104] Second, according to the water flow rate and water temperature at the project site, determine the slurry ratio under the water flow rate and water temperature conditions; then pour water into the slurry barrel 902, start the slurry barrel 902, and rotate the stirring blades in the slurry barrel 902, and then pour the powder grouting material obtained in step 1 into the slurry barrel 902, and the stirring blades will fully and evenly stir the powder grouting material and water to obtain a dynamic water-resistant dispersion grouting slurry.

[0105] Comparative Example 1:

[0106] This comparative example provides a grouting slurry, which is composed of the following raw materials in parts by mass: 66 parts of ordinary Portland cement and 34 parts of water.

[0107] Comparative Example 2:

[0108] This comparative example provides a grouting slurry, which is composed of the following raw materials in parts by mass: 66 parts of sulphoaluminate cement and 34 parts of water.

[0109] Comparative Example 3:

[0110] This comparative example provides a grouting slurry, which is composed of the following raw materials in parts by mass: 33.76 parts of sulphoaluminate cement, 7 parts of mineral powder, 25 parts of fly ash, 0.025 parts of hydroxypropyl methylcellulose ether, 0.015 parts of redispersible latex powder, 0.2 parts of cement dispersant, and 34 parts of water.

[0111] Comparative Example 4:

[0112] This comparative example provides a grouting slurry, which is composed of the following raw materials in parts by mass: 35 parts of sulphoaluminate cement, 5 parts of mineral powder, 5.235 parts of steel slag powder, 20 parts of fly ash, 0.5 parts of bentonite, 0.025 parts of hydroxypropyl methyl cellulose ether, 0.02 parts of redispersible latex powder, 0.2 parts of cement dispersant, 0.02 parts of citric acid, and 34 parts of water.

[0113] Embodiment 2:

[0114] This embodiment provides a dynamic water anti-dispersion grouting test system. Figure 1 As shown, it includes a support frame 1, and the support frame 1 includes a support top plate 101, and a plurality of support legs 102 are fixedly arranged on the bottom surface of the support top plate 101; a test trough 2 is arranged horizontally on the support top plate 101, and a pressure-stabilizing water cylinder 4 is arranged on the support top plate 101 on one horizontal side of the test trough 2, and the pressure-stabilizing water cylinder 4 is arranged vertically; a water outlet pipe 5 is arranged at the bottom of the other horizontal side of the test trough 2, and a grouting cylinder 6 is arranged vertically in the test trough 2.

[0115] The test tank 2 includes an outer insulation shell 201 arranged on the top surface of the supporting top plate 101, an inner test tank 202 is arranged in the outer insulation shell 201, and the space between the outer insulation shell 201 and the inner test tank 202 is a temperature control chamber 203; the top end of the inner test tank 202 is open and the bottom end is closed, and a movable cover plate 204 is arranged in the inner test tank 202 along the horizontal direction, and the space between the inner test tank 202 and the movable cover plate 204 is a dynamic water test chamber 205.

[0116] An air temperature regulating pipe 7 is arranged on the bottom surface of the outer heat-insulating shell 201 , the air outlet end of the air temperature regulating pipe 7 is connected to the temperature control chamber 203 , and the air inlet end of the air temperature regulating pipe 7 is connected to the air temperature controller 8 .

[0117] The water inlet end of the pressure-stabilizing water cylinder 4 is connected to the water outlet end of the water injection device 9, the water outlet end of the pressure-stabilizing water cylinder 4 is connected to the water inlet end of the dynamic water test chamber 205, and the water outlet end of the dynamic water test chamber 205 is connected to the water outlet pipe 5; the slurry inlet end of the grouting cylinder 6 is connected to the slurry outlet end of the grouting device 10, the slurry outlet end of the grouting cylinder 6 is connected to the slurry inlet end of the dynamic water test chamber 205, and the slurry outlet end of the dynamic water test chamber 205 is connected to the water outlet pipe 5.

[0118] In this embodiment, a water pressure stabilizer is provided in the pressure-stabilizing water cylinder 4, and the water pressure stabilizer adopts a conventional stabilizer known in the prior art.

[0119] In this embodiment, a waste liquid collection bucket 12 is further provided below the bottom end of the water outlet pipe 5 , and the waste liquid collection bucket 12 is used to collect waste liquid and waste slurry discharged from the water outlet pipe 5 .

[0120] In this embodiment, the air temperature controller 8 adopts a temperature controller known in the prior art, which can heat and cool the air. The air temperature regulating pipe 7 transports air of a certain temperature to the temperature control chamber 203, and the water temperature in the dynamic water test chamber 205 is maintained at a constant temperature through the temperature control chamber 203.

[0121] As a specific solution of this embodiment, Figure 2 As shown, a plurality of flow velocity-pressure sensors 11 are arranged on the bottom surface of the inner test tank 202, and the plurality of flow velocity-pressure sensors 11 are evenly arranged in a manner of equal horizontal spacing and equal vertical spacing, and the sensor matrix composed of the plurality of flow velocity-pressure sensors 11 includes a plurality of square grid units. It should be noted that, Figure 2 The longitudinal distribution of the flow rate-pressure sensor 11 is not shown.

[0122] In this embodiment, the flow rate-pressure sensor 11 adopts a sensor known in the prior art, and a flow rate sensing unit, a water pressure sensing unit and a weight sensing unit are disposed inside the flow rate-pressure sensor 11.

[0123] As a specific solution of this embodiment, Figure 2 As shown, a longitudinal pressure plate 206 and a transverse pressure plate 207 are fixedly arranged on the top surface of the movable cover plate 204 in sequence, the top ends of the adjusting bolts 208 are detachably installed on the transverse ends of the transverse pressure plate 207, and the bottom of the adjusting bolts 208 is detachably installed on the bottom surface of the inner test groove 202; the top ends of a pair of compression springs 209 are fixedly arranged on the bottom surface of the movable cover plate 204, the bottom ends of the pair of compression springs 209 are fixedly arranged on the bottom surface of the inner test groove 202, the pair of compression springs 209 are located on the transverse inner side of the adjusting bolt 208, and the compression springs 209 are wrapped with sealing tape 210.

[0124] In this embodiment, the distance between the movable cover 204 and the bottom surface of the inner test tank 202 is adjusted by adjusting the tightness of the adjusting bolt 208, and the structure composed of the sealing tape 210 and the compression spring 209 plays a role in supporting the movable cover 204, the longitudinal pressure plate 206 and the transverse pressure plate 207.

[0125] As a specific solution of this embodiment, Figure 1 As shown, a pressure stabilizing filter screen cylinder 3 is arranged at the bottom of the pressure stabilizing water cylinder 4. By arranging the pressure stabilizing water cylinder 4 and the pressure stabilizing filter screen cylinder 3 at the front end of the test tank 2, the water pressure is stabilized and quantitatively adjustable.

[0126] As a specific solution of this embodiment, Figure 1As shown, the water injection device 9 includes a water injection pipe 801 whose water outlet end is connected to the pressure-stabilizing water cylinder 4, and whose water inlet end is connected to the water tank 802. A water injection pump 803, a water injection pump control valve 804 and a water inlet temperature controller 805 are sequentially arranged on the water injection pipe 801.

[0127] In this embodiment, the water injection pump 803 adopts the water injection pump 803 known in the prior art, and the water injection device 9 is used to adjust the flow rate and temperature of water and transport water to meet the test requirements.

[0128] As a specific solution of this embodiment, Figure 1 As shown, the grouting device 10 includes a grouting pipe 901 whose slurry outlet end is connected to the grouting tube 6, and whose slurry inlet end is connected to the slurry barrel 902. A grouting pump 903 and a grouting pump control valve 904 are sequentially arranged on the grouting pipe 901.

[0129] Embodiment 3:

[0130] This embodiment provides a dynamic water anti-dispersion grouting test method, which uses the dynamic water anti-dispersion grouting test system of Example 2 to perform performance tests on the grouting slurries prepared in Example 1 and Comparative Examples 1 to 4. The method specifically includes the following steps:

[0131] Step 1, open the water injection pump control valve 804 and start the water injection pump 803, adjust the water injection pump control valve 804 to adjust the water flow rate to the flow rate required for the test, pump the water in the water tank 802 into the water injection pipe 801, and when the water flows through the water inlet temperature controller 805, the water inlet temperature controller 805 adjusts the water temperature to the temperature required for the test.

[0132] Step 2. After completing the temperature and flow rate adjustment of the water in step 1, continue to transport the water to the pressure-stabilizing water cylinder 4 through the water injection pipe 801. The water pressure is adjusted to the water pressure required for the test through the water pressure stabilizer and water injection pump 803 in the pressure-stabilizing water cylinder 4. The water in the pressure-stabilizing water cylinder 4 forms a stable and uniform water flow after passing through the pressure-stabilizing filter cylinder 3, and is transported to the dynamic water test chamber 205 to simulate the dynamic water environment required for the test.

[0133] Step three, start the air temperature controller 8 to adjust the air to the temperature required for the test, and then transport the temperature-adjusted air to the temperature control chamber 203 through the air temperature control pipe 7, so that the temperature of the dynamic water test chamber 205 is kept constant through the temperature control chamber 203.

[0134] Step four, start the grouting pump 903, and send the dynamic water anti-dispersion grouting slurry in the slurry barrel 902 into the dynamic water test chamber 205 through the grouting pipe 901 and the grouting tube 6. After entering the dynamic water test chamber 205, the dynamic water anti-dispersion grouting slurry diffuses in the simulated dynamic water environment.

[0135] Step 5: Use the flow rate-pressure sensor 11 to record the data of the slurry diffusion process in the dynamic water test chamber 205 in real time, and calculate and obtain the slurry retention rate based on the recorded data. The calculation process of the slurry retention rate is as follows:

[0136] Step 5.1, using formula I to calculate the slurry retention volume, formula I is:

[0137] V=∫nS x S y (P 泵 +P 稳 -P) / ρ 水 g Formula Ⅰ.

[0138] Where:

[0139] V represents the slurry retention volume, in m 3 .

[0140] n represents the number of grid cells in the sensor matrix.

[0141] S x Indicates the longitudinal spacing between adjacent flow velocity-pressure sensors, in meters.

[0142] S y Indicates the lateral spacing between adjacent flow velocity-pressure sensors, in meters.

[0143] P 泵 Indicates the head pressure output by the water injection pump, in MPa.

[0144] P 稳 Indicates the water head pressure in the dynamic water test chamber, in MPa.

[0145] P represents the head pressure monitored by a flow rate-pressure sensor, in MPa.

[0146] ρ 水 Indicates the density of water in kg / m 3 .

[0147] g means severe.

[0148] As a specific solution of this embodiment, the water head pressure in the dynamic water test chamber is calculated using the following formula IV:

[0149] P 稳 =P 泵 +ρ 水 HkDJ 稳 Formula IV.

[0150] Where:

[0151] P 稳Indicates the water head pressure in the dynamic water test chamber, in MPa.

[0152] P 泵 Indicates the head pressure output by the water injection pump, in MPa.

[0153] ρ 水 Indicates the density of water in kg / m 3 .

[0154] g means severe.

[0155] H 稳 It indicates the distance between the movable cover and the bottom surface of the inner test tank, in m.

[0156] Step 5.2, the slurry retention volume obtained in step 5.1 is substituted into formula II to calculate and obtain the slurry retention mass, which is:

[0157] M=ρ 浆 V-Formula II.

[0158] Where:

[0159] M represents the retained mass of slurry, in kg.

[0160] P 泵 Indicates the head pressure output by the water injection pump, in MPa.

[0161] V represents the slurry retention volume, in m 3 .

[0162] Step 5.3, the slurry retention mass obtained in step 5.2 is substituted into formula III to calculate and obtain the slurry retention rate, which is:

[0163]

[0164] Where:

[0165] β represents the slurry retention rate.

[0166] M represents the retained mass of slurry, in kg.

[0167] M 注 It indicates the mass of slurry injected into the dynamic water test chamber, in kg.

[0168] Q represents the flow rate of slurry, in m 3 .

[0169] ρ 浆 Indicates the density of the slurry in kg / m 3 .

[0170] In this embodiment, the longitudinal diffusion radius R of the slurry 纵and the lateral diffusion radius R of the slurry 横 , can determine the diffusion effect of the slurry. The longitudinal diffusion radius R of the slurry 纵 It is equal to the longitudinal diffusion distance of the slurry in the test tank and the lateral diffusion radius of the slurry R 横 It is equal to half of the lateral diffusion distance of the slurry in the test tank.

[0171] In this embodiment, the performance test results of the grouting slurries of Example 1 and Comparative Examples 1 to 4 are as follows: Figures 3 to 5 As shown:

[0172] Depend on Figures 3 to 5 It can be seen that compared with comparative examples 1 to 4, the slurry retention rate of Example 2 in a high flow rate of 1.2 m / s is higher. The slurry retention rate of Example 2 in a temperature of 20°C and a 1.2 m / s flow water environment reaches 98.6%, the slurry retention rate in a temperature of 10°C and a 1.2 m / s flow water environment reaches 94.4%, and the slurry retention rate in a temperature of 5°C and a 1.2 m / s flow water environment reaches 85.5%. The permeability coefficient of the slurry is less than 10 -7 cm / s.

[0173] From the above analysis, it can be seen that under different temperature environments and extremely high dynamic water conditions, the slurry retention rate of the dynamic water anti-dispersion grouting slurry in a high flow rate dynamic water environment is higher than 80%, indicating that the dynamic water anti-dispersion grouting slurry has good anti-scour performance and can be used to block sudden groundwater inrush in formation cracks, pores or large channels under different temperatures and different flow rates, and can shorten the rescue time and grouting amount of sudden water inrush accidents in mines.

Claims

1. A dynamic water anti-dispersion grouting test system, comprising a support frame (1), wherein the support frame (1) includes a support top plate (101), and a plurality of support legs (102) are fixedly arranged on the bottom surface of the support top plate (101); Characterized in that, a test tank (2) is arranged horizontally on the support top plate (101), a pressure stabilizing filter cylinder (3) is arranged vertically on the support top plate (101) on one lateral side of the test tank (2), and a pressure stabilizing water cylinder (4) is integrally arranged at the top end of the pressure stabilizing filter cylinder (3); a water outlet pipe (5) is arranged at the bottom on the other lateral side of the test tank (2), and a grouting cylinder (6) is arranged vertically in the test tank (2); the test tank (2) includes an outer heat preservation shell (201) arranged on the top surface of the support top plate (101), an inner test tank (202) is arranged inside the outer heat preservation shell (201), and the space between the outer heat preservation shell (201) and the inner test tank (202) is a temperature control chamber (203); the top end of the inner test tank (202) is open and the bottom end is closed, and a movable cover plate (204) is arranged horizontally in the inner test tank (202), and the space between the inner test tank (202) and the movable cover plate (204) is a dynamic water test chamber (205); an air temperature control pipe (7) is arranged on the bottom surface of the outer heat preservation shell (201), the air outlet end of the air temperature control pipe (7) is communicated with the temperature control chamber (203), and the air inlet end of the air temperature control pipe (7) is communicated with an air temperature controller (8); the water inlet end of the pressure stabilizing water cylinder (4) is communicated with the water outlet end of a water injection device (9), the water outlet end of the pressure stabilizing water cylinder (4) is communicated with the water inlet end of the pressure stabilizing filter cylinder (3), the water outlet end of the pressure stabilizing filter cylinder (3) is communicated with the water inlet end of the dynamic water test chamber (205), and the water outlet end of the dynamic water test chamber (205) is communicated with the water outlet pipe (5); the grout inlet end of the grouting cylinder (6) is communicated with the grout outlet end of a grouting device (10), the grout outlet end of the grouting cylinder (6) is communicated with the grout inlet end of the dynamic water test chamber (205), and the grout outlet end of the dynamic water test chamber (205) is communicated with the water outlet pipe (5).

2. The dynamic water anti-dispersion grouting test system according to claim 1, Characterized in that, a plurality of flow velocity-pressure sensors (11) are arranged on the bottom surface of the inner test tank (202), the plurality of flow velocity-pressure sensors (11) are uniformly arranged in an equal lateral spacing and equal longitudinal spacing manner, and the sensor matrix composed of the plurality of flow velocity-pressure sensors (11) includes a plurality of grid units.

3. The dynamic water anti-dispersion grouting test system according to claim 1, Characterized in that, On the top surface of the movable cover plate (204), a longitudinal pressing plate (206) and a transverse pressing plate (207) are fixedly arranged in sequence. At the transverse two ends of the transverse pressing plate (207), the tops of adjusting bolts (208) are detachably installed, and the bottoms of the adjusting bolts (208) are detachably installed on the bottom surface of the inner test tank (202); at the bottom surface of the movable cover plate (204), the tops of a pair of compression springs (209) are fixedly arranged, and the bottoms of the pair of compression springs (209) are fixedly arranged on the bottom surface of the inner test tank (202). The pair of compression springs (209) are located transversely inside the adjusting bolts (208), and a sealing tape (210) is wound outside the compression springs (209).

4. The dynamic water anti-dispersion grouting test system according to claim 1, characterized in that the water injection device (9) includes a water injection pipe (801) with a water outlet end communicated with the constant-pressure water cylinder (4), the water inlet end of the water injection pipe (801) is communicated with a water tank (802), and a water injection pump (803), a water injection pump control valve (804) and a water inlet temperature controller (805) are sequentially arranged on the water injection pipe (801).

5. The dynamic water anti-dispersion grouting test system according to claim 1, characterized in that the grouting device (10) includes a grouting pipe (901) with a grout outlet end communicated with the grouting cylinder (6), the grout inlet end of the grouting pipe (901) is communicated with a grout mixing barrel (902), and a grouting pump (903) and a grouting pump control valve (904) are sequentially arranged on the grouting pipe (901).

6. A dynamic water anti-dispersion grouting test method, characterized in that using the dynamic water anti-dispersion grouting test system according to any one of claims 1 to 5 to conduct performance testing on the grouting slurry; the method specifically includes the following steps: Step 1, adjust the flow rate of water to the flow rate required for the test, and adjust the temperature of water to the temperature required for the test; Step 2, after completing the adjustment of the temperature and flow rate of water in Step 1, use the water injection device (9) to transport water into the constant-pressure water cylinder (4), adjust the water pressure in the constant-pressure water cylinder (4) to the water pressure required for the test, and the water flow in the constant-pressure water cylinder (4) forms a stable and uniform water flow after passing through the constant-pressure filter cylinder (3), and is transported into the dynamic water test chamber (205) to simulate the dynamic water environment required for the test; Step 3, start the air temperature controller (8) to adjust the air to the temperature required for the test, and then transport the adjusted-temperature air into the temperature control chamber (203) through the air temperature adjustment pipe (7), and keep the temperature of the dynamic water test chamber (205) constant through the temperature control chamber (203); Step 4, use the grouting device (10) to send the dynamic water anti-dispersion grouting slurry into the dynamic water test chamber (205), and the dynamic water anti-dispersion grouting slurry diffuses in the simulated dynamic water environment after entering the dynamic water test chamber (205); Step 5, record the data during the diffusion process of the slurry in the dynamic water test chamber (205), and calculate and obtain the slurry retention rate according to the recorded data.

7. The dynamic water anti-dispersion grouting test method according to claim 6, characterized in that in Step 5, the calculation process of the slurry retention rate is as follows: Step 5.1, calculate the slurry retention volume using Equation Ⅰ, and the Equation Ⅰ is as follows: Formula Ⅰ; In the formula: Indicates the slurry retention volume, in m 3 ; n represents the number of grid cells in the sensor matrix; Indicates the longitudinal spacing between adjacent flow velocity-pressure sensors, in m; Denotes the lateral spacing between adjacent flow velocity-pressure sensors, in m; Indicates the head pressure output by the injection water pump, with the unit of MPa; Indicates the head pressure in the hydrodynamic test chamber, with the unit of MPa; It represents the head pressure monitored by a certain flow velocity - pressure sensor, with the unit of MPa; represents the density of water, in kg / m 3 ; Indicates severe; Step 5.2, substitute the slurry retention volume obtained in Step 5.1 into Equation Ⅱ, calculate and obtain the slurry retention mass, and the Equation Ⅱ is as follows: Formula II; In the formula: Indicates the slurry retention quality, with the unit of kg; Indicates the head pressure output by the injection pump, with the unit of MPa; Indicates the slurry retention volume, in m 3 ; Step 5.3, substitute the slurry retention mass obtained in Step 5.2 into Equation Ⅲ, calculate and obtain the slurry retention rate, and the Equation Ⅲ is as follows: Formula III; In the formula: Indicates the slurry retention rate; Indicates the slurry retention quality, with the unit of kg; Indicates the mass of the slurry injected into the hydrodynamic test chamber, with the unit of kg; Indicates the flow rate of the slurry, in m 3 ; Indicates the density of the slurry, in kg / m 3 .

8. The dynamic water anti-dispersion grouting test method according to claim 7, characterized in that in Step 5.1, the water head pressure in the dynamic water test chamber is calculated and obtained by the following Equation Ⅳ: Formula IV; In the formula: Indicates the water head pressure in the hydrodynamic test chamber, with the unit of MPa; Indicates the head pressure output by the injection water pump, with the unit of MPa; represents the density of water, in kg / m 3 ; Indicates severe; Indicates the distance between the movable cover plate and the bottom surface of the inner test tank, with the unit of m.

9. The dynamic water anti-dispersion grouting test method according to claim 8, characterized in that the grouting slurry is a dynamic water anti-dispersion grouting slurry, and the dynamic water anti-dispersion grouting slurry is composed of the following raw materials in parts by mass: 22-40 parts of sulfoaluminate cement, 4-10 parts of mineral powder, 3-8 parts of steel slag powder, 8-25 parts of fly ash, 1-3 parts of bentonite, 0.02-0.05 parts of hydroxypropyl methyl cellulose ether, 0.02-0.05 parts of redispersible latex powder, 0.1-0.4 parts of cement dispersant, 0.007-0.07 parts of citric acid, 0.02-1.0 parts of lithium carbonate, 0.03-2.0 parts of calcium formate, and 20-40 parts of water, and the sum of the mass parts of the raw materials is 100 parts.

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