A temperature control fracture network grouting experiment device and method

Abstract

The present application relates to the field of fissure grouting, in particular to a temperature control fissure network grouting experiment device, comprising: a transparent fissure model formed by upper cover surface and fissure network upper and lower adhesion, the upper cover surface is provided with grouting hole, the upper cover surface and the periphery of fissure network are provided with water stop structure; Array distribution type sheet pressure sensor is arranged below fissure network, which is used for monitoring the change of permeation pressure of each place in the fissure of transparent fissure model; Double liquid grouting system is connected with the inlet of transparent fissure model, which is used for injecting slurry into the fissure of transparent fissure model; Camera is arranged above transparent fissure model; Constant pressure water injection system is connected with transparent fissure model; Temperature control system is arranged outside transparent fissure model. The present application provides a new solution for the optimization design and scientific evaluation of rock mass grouting technology by system integration of multifunctional device and innovative test method.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fissure grouting, in particular to a temperature-controlled fissure network grouting experiment device and method. BACKGROUND

[0002] The grouting reinforcement technology of rock mass fissure is an important reinforcement and anti-seepage measure in geotechnical engineering, and is widely used in engineering practice, such as groundwater sealing, tunnel support, dam reinforcement of water conservancy and hydropower engineering, and mine seepage prevention, etc. In actual engineering, the geometric structure of fissure network is complex and changeable, and the engineering environment is often accompanied by extreme temperature conditions, such as deep tunnel construction in high temperature areas or groundwater treatment in cold areas. These environmental factors have important influence on the performance of grouting material and the plugging effect. For example, low temperature conditions can significantly reduce the fluidity of the slurry and the hydration speed of the cement, thereby affecting the diffusion range, filling effect and plugging quality of the slurry. However, the experimental research on grouting behavior under complex fissure network and extreme environmental conditions is still relatively weak at present, especially lacking precise experimental devices and monitoring technologies.

[0003] The existing grouting experiment device mainly aims at simple fissures, and uses a single-point pressure sensor to monitor the pressure change in the grouting process. However, in a complex fissure network, the pressure change has obvious randomness and uneven distribution characteristics, and single-point monitoring cannot fully reflect the grouting behavior of the fissure network. At the same time, the existing device has poor adaptability to extreme temperature conditions, and it is difficult to systematically evaluate the influence of temperature on the grouting effect. In addition, the monitoring of the grouting plugging effect mainly relies on indirect methods, and lacks dynamic and quantitative analysis of the evolution of permeability and the anti-scouring ability of the plugged area. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a temperature-controlled fissure network grouting experiment device and a dynamic monitoring method for plugging effect, which can realize sensitive capture of multi-point pressure distribution in the fissure network, simulation of extreme temperature conditions, and quasi-three-dimensional visualization and dynamic quantitative evaluation of the plugging effect.

[0005] According to an aspect of the present application, a temperature-controlled fissure network grouting experiment device is provided, comprising:

[0006] A transparent fissure model is formed by the upper cover surface and the fissure network, the upper cover surface is provided with a grouting hole, and the upper cover surface and the fissure network are provided with a water stop structure around;

[0007] An array distributed sheet pressure sensor is arranged below the fissure network for monitoring the permeation pressure change at each position in the fissure of the transparent fissure model;

[0008] A double-liquid grouting system is connected to the inlet of the transparent fissure model for injecting slurry into the fissure of the transparent fissure model;

[0009] a camera disposed above the transparent fracture model for monitoring the grouting process of the transparent fracture model;

[0010] a constant pressure water injection system connected to the transparent fracture model for injecting water into the transparent fracture model at a constant pressure;

[0011] a temperature control system disposed outside the transparent fracture model for simulating a high-temperature or cold grouting environment.

[0012] As a further technical solution, the water stop structure comprises an inlet cavity disposed on one side of the upper cover and the fracture network, and an outlet cavity disposed on the other side of the upper cover and the fracture network. The two sides of the upper cover and the fracture network are respectively provided with left and right acrylic side strips. The outer sides of the upper cover and the fracture network are respectively provided with upper, lower, front, rear, left and right acrylic clamps.

[0013] As a further technical solution, the double-liquid grouting system comprises a plunger pump A, a plunger pump B, a three-way valve and a static mixer. The plunger pump A and the plunger pump B are connected to the three-way valve through a grouting pipeline. The three-way valve is connected to the static mixer through a grouting pipeline. The static mixer is connected to the grouting hole of the transparent fracture model through a grouting pipeline. A pressure sensor is arranged on the grouting pipeline between the static mixer and the grouting hole.

[0014] As a further technical solution, the experimental device further comprises a flat light source one and a flat light source two disposed above the transparent fracture model for lighting the transparent fracture model.

[0015] As a further technical solution, the experimental device further comprises a support system. The support system comprises a stage. Vertical support rods one and two are fixed on the stage. Fixed blocks one and two are disposed on the vertical support rods one and two. A horizontal support rod one is disposed on the fixed block one. The camera is mounted on the horizontal support rod one. Horizontal support rods two and three are disposed on the fixed block two. The flat light source one and the flat light source two are mounted on the horizontal support rods two and three, respectively.

[0016] As a further technical solution, the constant pressure water injection system comprises a marple bottle, a lifting platform and a mass flow sensor. The marple bottle is placed on the lifting platform. The marple bottle is in communication with the grouting hole of the transparent fracture model through a pipeline. The mass flow sensor is arranged on the pipeline between the marple bottle and the grouting hole. The outlet of the transparent fracture model is connected to a waste liquid bottle through a pipeline. The waste liquid bottle is placed above a high-precision electronic scale.

[0017] As a further technical solution, the temperature control system comprises circulating water pipes arranged around and under the fissure in the transparent fissure model, and high and low temperature circulating pumps connected with the inlet and outlet of the circulating water pipes.

[0018] As a further technical solution, the experimental device further comprises a waste liquid recovery bottle and an analysis system, the waste liquid recovery bottle and the analysis system comprising a test tube and a liquid chromatograph, for taking an appropriate amount of waste liquid from the test tube for slurry composition analysis by the liquid chromatograph.

[0019] According to an aspect of the present application, a temperature-controlled fissure network grouting experiment method is provided, comprising the following steps:

[0020] The high and low temperature circulating pumps are started, the temperature around the fissure of the transparent fissure model is set to the set temperature, and after uniform and stable, the valve of the marshall bottle is opened, the fluid will flow out of the marshall bottle, pass through the transparent fissure model and flow into the waste liquid bottle;

[0021] When the fluid passes through the transparent fissure model, the array distributed thin slice pressure sensor is used to obtain the seepage pressure change at each position in the fissure, and the mass flow sensor and high-precision electronic scale are used to record the mass flow of the fluid;

[0022] After the transparent fissure model is saturated and the liquid flow is stable, the camera, the flat light source one and the flat light source two are started to record the slurry diffusion process in real time, the pressure sensor is used to record the grouting pressure change, the plunger pump A and the plunger pump B are started to inject two kinds of solutions at the set flow rate, the two kinds of solutions are mixed in the static mixer and then injected into the transparent fissure model through the grouting hole, after the injection reaches the set pressure or flow rate, the plunger pump A and the plunger pump B are closed;

[0023] A new waste liquid bottle is replaced, and an appropriate amount of waste liquid is taken from the new waste liquid bottle with a test tube for slurry composition analysis by a liquid chromatograph, and the mass of the washed and fallen solids is quantified;

[0024] After the flushing reaches the set time, all the instruments are closed, and the experiment is ended.

[0025] Compared with the prior art, the present application has the following advantages:

[0026] 1. The present application has significant advantages compared with the prior art by constructing a fissure network structure and combining advanced sensing technology and visualization technology. The design of the fissure network not only better fits the complex fissure distribution in real engineering, but also effectively improves the representativeness and reliability of the experimental results. The array distributed thin slice pressure sensor can dynamically capture the seepage pressure distribution and change law at each position in the fissure network, significantly improving the monitoring accuracy and timeliness.

[0027] 2、And, the device integrates a high-resolution camera and an adjustable light supplement device, not only realizing intuitive observation of the slurry diffusion range, but also quantitatively evaluating the slurry thickness distribution and diffusion form, and providing quasi-three-dimensional visualization results.

[0028] 3、Meanwhile, by arranging a circulating water pipe around the fissure and connecting a high-low temperature circulating pump, the influence of different temperature environments on the slurry performance and plugging effect is successfully simulated, thereby providing important data support for the optimization design of grouting under complex working conditions.

[0029] 4、The built-in Mariotte bottle constant pressure water injection system and mass flow sensor of the device can also accurately reflect the dynamic changes of the permeability in real time, and by combining the outlet waste liquid quality and slurry composition analysis, the slurry shedding amount in the flushing process can be quantified, so as to evaluate the anti-scouring ability and long-term stability of the plugging area.

[0030] 5、In addition, the device adopts modular design, supports rapid assembly and flexible test setting, reduces the maintenance and operation cost, and significantly improves the test efficiency and applicability. The innovative design of the fissure network and the integration of the overall system provide more practical technical support for the development and engineering application of grouting technology. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Figure 1 A schematic diagram of the temperature-controlled fissure network grouting experiment device provided by the embodiment of the present application.

[0033] Figure 2 A schematic diagram of the transparent fissure model, pressure sensor, circulating water pipe and water stop structure of the temperature-controlled fissure network grouting experiment device provided by the embodiment of the present application.

[0034] Figure 3 A fissure, pressure sensor, circulating water pipe and clamp arrangement diagram of the temperature-controlled fissure network grouting experiment device provided by the embodiment of the present application.

[0035] Figure 4 A fissure network plan view of the temperature-controlled fissure network grouting experiment device provided by the embodiment of the present application.

[0036] Fig. 1: 1, transparent fracture model; 101, upper cover; 102, fracture network; 103, grouting hole; 104, inlet cavity; 105, outlet cavity; 106, left acrylic side strip; 107, right acrylic side strip; 108, upper acrylic splint; 109, lower acrylic splint; 110, front acrylic splint; 111, rear acrylic splint; 112, left acrylic splint; 113, right acrylic splint; 2, array distribution thin slice pressure sensor; 3, plunger pump A; 4, plunger pump B; 5, three-way valve; 6, static mixer; 7, pressure sensor; 8, stage; 9, vertical support rod one; 10, vertical support rod two; 11, horizontal support rod one; 12, horizontal support rod one; 13, horizontal support rod three; 14, fixed block one; 15, fixed block two; 16, camera; 17, flat light source one; 18, flat light source two; 19, marshall bottle; 20, lifting platform; 21, mass flow sensor; 22, waste liquid bottle; 23, high-precision electronic scale; 24, test tube; 25, liquid chromatograph; 26, circulating water pipe; 27, high-low temperature circulating pump; 28, computer. DETAILED DESCRIPTION

[0037] The terms "comprising" and "having" and any variations thereof in the specification and in the claims and the accompanying drawings of the present application, are intended to cover the inclusion not the exclusion of one or more steps or elements, for example, a process, method, system, product or apparatus, that includes a series of steps or units, not necessarily limited to those explicitly listed, but can include other steps or units that are not expressly listed or inherent to such process, method, product or apparatus.

[0038] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application. In addition, the technical features in each embodiment or in a single embodiment provided by the present application can be combined with each other to form new technical solutions, and such combination is not restricted by the order of steps and / or structure composition mode, but must be based on the realization by those skilled in the art, when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that such combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0039] In actual engineering, the evaluation and control of grouting effect not only depend on the analysis of grout diffusion range and seepage pressure distribution, but also are significantly affected by environmental conditions such as temperature and flow rate. However, the prior art has the following obvious deficiencies:

[0040] (1) Lack of accurate monitoring of complex flow characteristics of fracture network: Traditional test devices are usually based on a single fracture model, making it difficult to effectively simulate multi-directional seepage behavior in complex fracture networks, especially the dynamic change characteristics of the interaction between fractures have not been fully studied.

[0041] (2) Insufficient consideration of the influence of environmental temperature on grouting process: In actual engineering, high or low temperature environment will significantly affect the fluidity, diffusion range and plugging effect of the slurry, but the existing test method cannot effectively simulate and observe under different temperature conditions, and cannot reveal the influence law and key factors of temperature on grouting effect.

[0042] (3) Lack of real-time accurate reflection of plugging effect and evaluation of anti-scouring capacity: Current test devices mostly focus on observing the diffusion behavior of the slurry, but lack real-time quantitative analysis of the plugging effect, especially the anti-scouring performance and long-term stability after fracture plugging are difficult to be fully evaluated by existing means.

[0043] (4) Insufficient precision and depth of visual observation: Although existing devices support visual observation of slurry diffusion, the image quality and observation accuracy are limited, and cannot clearly reflect the thickness of slurry filling, the scouring condition of diffusion edge and the dynamic distribution characteristics in three-dimensional space.

[0044] To solve the above problems, the present application proposes a temperature-controlled fracture network grouting test device, as shown in Figures 1-4 , which includes a transparent fracture model 1, an array distribution type sheet pressure sensor 2, a double liquid grouting system, a support system, a camera 16, a constant pressure dynamic water injection system, a waste liquid recovery bottle and analysis system, a temperature control system and a computer 28.

[0045] In this embodiment, the transparent fracture model 1 is formed by the upper cover surface 101 made of transparent flat plate glass and the upper and lower epoxy resin fracture network 102, the upper cover surface 101 is engraved with grouting holes 103 near the inlet end, and the upper cover surface 101 and the fracture network 102 are provided with water stop structure around.

[0046] The water stop structure includes an inlet cavity 104 arranged on one side of the upper cover surface 101 and the fracture network 102, an outlet cavity 105 arranged on the other side of the upper cover surface 101 and the fracture network 102, left and right acrylic side strips 106 and 107 arranged on both sides of the upper cover surface 101 and the fracture network 102, and upper, lower, front and rear acrylic clamps 108, 109, 110 and 111 arranged on the outer side of the upper cover surface 101 and the fracture network 102.

[0047] The water stopping effect of the transparent fracture model 1 is improved by arranging the left and right acrylic side strips 106 and 107, the upper and lower acrylic clamping plates 108 and 109, the front and rear acrylic clamping plates 110 and 111, and the left and right acrylic clamping plates 112 and 113, and the slurry inlet is arranged on the upper acrylic clamping plate 108 at a position corresponding to the grouting hole 103, so that the slurry can enter the fracture through the slurry inlet and the grouting hole 103.

[0048] In use, the bolt is used for anchoring, and the array distribution type thin sheet pressure sensor 2 is placed under the epoxy resin fracture network 102 and has a size suitable for the size of the fracture network 102, and the number of sites can be set according to requirements. The more dense, the more accurately the permeation pressure change at each position in the fracture can be reflected. The pressure signal is transmitted to the computer 28 through Bluetooth.

[0049] In the present application, the rough network is changed into the fracture network 102. The existing single straight insertion site pressure sensor arrangement is difficult, and the randomness of the pressure change site is great. The fracture network 102 is matched with the dot matrix thin sheet sensor, which can more sensitively capture the pressure change of each site.

[0050] In the embodiment, the double-liquid grouting system is connected to the inlet of the transparent fracture model 1, and is used for injecting the slurry into the fracture of the transparent fracture model 1.

[0051] Specifically, the double-liquid grouting system includes a plunger pump A3, a plunger pump B4, a three-way valve 5, and a static mixer 6. The plunger pump A3 and the plunger pump B4 are ISCO plunger pumps. The plunger pump A3 and the plunger pump B4 are connected to the three-way valve 5 through a grouting pipeline. The three-way valve 5 is connected to the static mixer 6 through a grouting pipeline. The static mixer 6 is connected to the grouting hole 103 of the transparent fracture model 1 through a grouting pipeline. Meanwhile, a pressure sensor 7 is arranged on the grouting pipeline between the static mixer 6 and the fracture grouting hole 103, and is used for monitoring the grouting pressure data.

[0052] In use, the two components of the slurry are injected by the plunger pump A3 and the plunger pump B4 respectively. The plunger pump can accurately control the grouting flow rate and pressure, so that the experimental results are more accurate and reliable. The two-way slurry enters the static mixer 6 through the three-way valve 5, is fully mixed, and then is injected into the fracture through the fracture grouting hole 103. The pressure sensor 7 arranged on the grouting pipeline between the static mixer 6 and the fracture grouting hole 103 can be used for monitoring the grouting pressure data.

[0053] In the embodiment, the experimental device further includes a flat light source one 17 and a flat light source two 18 arranged above the transparent fracture model 1, which are used for lighting the transparent fracture model 1 to improve the imaging quality of the camera 16.

[0054] The application can not only observe the diffusion range but also judge the thickness of the slurry filling, thereby visualizing the plugging effect by setting the camera 16 in combination with the adjustable flat light source one 17 and the flat light source two 18.

[0055] In the embodiment, the experimental device further comprises a support system for providing mounting positions for the camera 16, the flat light source one 17 and the flat light source two 18.

[0056] Specifically, the support system comprises a stage 8, the stage 8 is fixed with a vertical support rod one 9 and a vertical support rod two 10, the vertical support rod one 9 and the vertical support rod two 10 are jointly provided with a fixed block one 14 and a fixed block two 15, the fixed block one 14 is provided with a horizontal support rod one 11, the camera 16 is mounted on the horizontal support rod one 11, the fixed block two 15 is provided with a horizontal support rod two 12 and a horizontal support rod three 13, the flat light source one 17 and the flat light source two 18 are respectively mounted on the horizontal support rod two 12 and the horizontal support rod three 13.

[0057] In use, the camera 16 is fixed above the transparent fracture model 1 through the fixed block one 14 and the horizontal support rod one 11, and the height, left-right position and front-rear angle of the camera 16 can be adjusted through bolts. The flat light source one 17 and the flat light source two 18 for light supplement are respectively fixed through the fixed block two 15 and the horizontal support rod two 12 and the horizontal support rod three 13, and the height, left-right position and front-rear angle of the flat light source one 17 and the flat light source two 18 can be adjusted through bolts, and the light intensity of the flat light source one 17 and the flat light source two 18 can be adjusted to obtain the best picture imaging quality. How to adjust through bolts is a known technology, which is not described in detail here.

[0058] In the embodiment, a constant-pressure dynamic water injection system is connected with the transparent fracture model 1, for injecting water flow into the transparent fracture model 1 at constant pressure.

[0059] Specifically, the constant-pressure dynamic water injection system comprises a marini bottle 19, a lifting table 20 and a mass flow sensor 21, the marini bottle 19 is placed on the lifting table 20, the marini bottle 19 is in communication with the grouting hole 103 of the transparent fracture model 1 through a pipeline, the mass flow sensor 21 is arranged on the pipeline between the marini bottle 19 and the grouting hole 103, the outlet of the transparent fracture model 1 is connected with a waste liquid bottle 22 through a pipeline, and the waste liquid bottle 22 is placed above a high-precision electronic scale 23.

[0060] In use, the marini bottle 19 is used to realize constant-pressure injection, the lifting table 20 can be adjusted to a set water head height, the mass flow sensor 21 can measure the flow change, the change of permeability in the fracture is reflected, the plugging effect is judged, and the liquid flowing out of the transparent fracture model 1 can flow into the waste liquid bottle 22, and the mass change of the outlet waste liquid can be weighed by the high-precision electronic scale 23.

[0061] The water flows through the mass flow sensor 21 and is injected into the inlet cavity 104, and then flows into the fissure of the transparent fissure model 1, and is connected to the waste liquid bottle 22 at the outlet, and the mass change of the outlet waste liquid is weighed by the high-precision electronic scale 23, which further reflects the plugging effect. The constant pressure water injection of the Mariotte bottle 19 combined with the mass flow sensor 21 can realize the real-time and accurate reaction of the plugging effect.

[0062] In this embodiment, the temperature control system is arranged outside the transparent fissure model 1, which is used to simulate the grouting environment in high-temperature or cold regions, and successfully simulates the influence of different temperature environments on the performance of the slurry and the plugging effect.

[0063] Specifically, the temperature control system comprises a circulating water pipe 26 arranged around and below the fissure of the transparent fissure model 1, and a high-low temperature circulating pump 27 connected thereto, which can create a constant temperature environment for the fissure device by circulating constant temperature water flow, and simulate the grouting environment in high-temperature or cold regions.

[0064] Since low-temperature grouting is inevitable in actual projects, low temperature will affect the cement hydration process and the liquidity of the slurry, and then affect the plugging effect, so by creating a low-temperature environment through the circulating water pipe 26, the influence degree and influencing factor analysis of low temperature can be obtained by comparing the plugging effect of the same working condition at normal temperature.

[0065] In addition, the waste liquid recovery bottle and the analysis system can also simultaneously take a certain amount of waste liquid with the test tube 24 at a certain time to analyze the slurry composition by the liquid chromatograph 25, and quantify the mass of the washed and fallen.

[0066] The application tests the anti-scouring ability of the plugging area under high flow conditions after the plugging is completed, quantifies the mass of the washed and fallen through the mass change of the outlet waste liquid and the slurry composition analysis, and evaluates the long-term stability of the plugging effect according to the permeability and pressure change before and after the scouring.

[0067] All the sensors in the device and the high-precision electronic scale 23 can connect the signals to the computer 28 for data reading and saving.

[0068] Before the test starts, first prepare the transparent fissure model 1, and complete the assembly of each instrument, which specifically includes the following steps:

[0069] Cut the transparent flat glass to the specified size as the transparent upper cover 101, and engrave the threaded grouting hole 103; design the fissure network model, and make the epoxy resin fissure network 102 through pouring and curing;

[0070] The transparent upper cover 101 and the epoxy fissure network 102 are combined together, the left and right acrylic side bars 106 and 107 and the inlet and outlet cavities 104 and 105 are assembled to the fissure, and the upper and lower acrylic clamps 108 and 109, the front and rear acrylic clamps 110 and 111, and the left and right acrylic clamps 112 and 113 are anchored by bolts to obtain the transparent fissure model 1. Figure 3

[0071] To enhance the water stopping effect, flexible epoxy resin or rubber strips can be added between the left and right acrylic side bars 106 and 107 and the inlet and outlet cavities 104 and 105 and the fissure.

[0072] In addition, during assembly, the array distributed thin film pressure sensor 2 can be placed between the epoxy fissure network 102 and the circulating water pipe 26, and the circulating water pipe 26 is placed on the lower acrylic clamp 109, and the inlet and outlet of the circulating water pipe 26 correspond to the reserved pipe openings on the right acrylic clamp 113.

[0073] Pipeline connection: first connect the outlets of the plunger pumps A3 and B4 to the two inlets of the three-way valve 5, connect the outlet of the three-way valve 5 to the static mixer 6, connect the static mixer 6 to the grouting hole 103 through the grouting pipe, and connect a pressure sensor 7 between the static mixer 6 and the grouting hole 103 to measure the grouting pressure.

[0074] At the same time, after injecting water into the marshall bottle 19 to a suitable height, placing it on the lifting platform 20, adjusting the lifting platform 20 to a suitable height H, connecting the water outlet of the marshall bottle 19 to the inlet of the mass flow sensor 21, connecting the outlet of the mass flow sensor 21 to the inlet cavity 104 of the transparent fissure model 1, and connecting the outlet cavity 105 of the transparent fissure model 1 to the waste liquid bottle 22 placed on the high-precision electronic scale 23.

[0075] Finally, connect the inlet and outlet of the circulating water pipe 26 to the high-low temperature circulating pump 27, and the pipeline connection is completed.

[0076] Imaging quality adjustment: connect the computer 28 and the camera 16, turn on the flat light source one 17 and the flat light source two 18, and adjust the height, left and right position, front and rear angle, and light intensity of the camera 16 and the flat light source one 17 and the flat light source two 18 by adjusting the horizontal support rods one 11, two 12 and three 13 and the fixed blocks one 14 and two 15 to obtain the best picture imaging quality.

[0077] ​Slurry preparation: The cement slurry and water glass solution need to be prepared for the cement-water glass double-liquid grouting. The cement slurry and water glass solution are prepared according to the water-cement ratio and the Baume degree set in the experiment, and are respectively filled into the piston pump A3 and the piston pump B4.

[0078] After the above assembly work is completed, the rock fracture network dynamic water grouting visualization experiment under different temperatures can be carried out.

[0079] A temperature-controlled fracture network grouting test method, comprising the following steps:

[0080] S1, first start the high-low temperature circulating pump 27, measure the temperature around the fracture of the transparent fracture model 1 through the thermometer, open the Bluetooth of the array distributed thin slice pressure sensor 2 to receive the pressure signal after the temperature reaches the set temperature and is uniform and stable, open the mass flow sensor 21 and the high-precision electronic scale 23 to record the mass flow, and open the valve of the marangoni bottle 19, the fluid will flow out of the marangoni bottle 19, flow into the waste liquid bottle 22 after passing through the transparent fracture model 1.

[0081] S2, when the fluid passes through the transparent fracture model 1, the permeation pressure change at each position in the fracture is obtained through the array distributed thin slice pressure sensor 2, and the mass flow of the fluid is recorded through the mass flow sensor 21 and the high-precision electronic scale 23;

[0082] S3, after the transparent fracture model 1 is saturated and the liquid flow is stable, open the camera 16 to record the slurry diffusion process in real time, open the pressure sensor 7 to record the grouting pressure change, open the piston pump A3 and the piston pump B4 to inject cement and water glass solution according to the set flow rate, mix the two in the static mixer 6, and then inject into the transparent fracture model 1 through the grouting hole 103, and after the injection reaches the set pressure or flow rate, close the piston pump A3 and the piston pump B4.

[0083] S4, replace the new waste liquid bottle 22, and use the test tube 24 to take an appropriate amount of waste liquid from the new waste liquid bottle 22 at a fixed time to analyze the slurry composition by using the liquid chromatograph 25, and quantify the mass of the washed and fallen solids;

[0084] S5, after flushing to the set time, close the valve of the marangoni bottle 19, close the camera 16 and the high-precision electronic scale 23, close the pressure sensor 7, the array distributed thin slice pressure sensor 2 and the mass flow sensor 21, close the high-low temperature circulating pump 27, the experiment is completed, disassemble and clean the transparent fracture model 1 for the next experiment.

[0085] In summary, the device can realize accurate simulation and analysis of slurry diffusion behavior and plugging effect in complex fracture network. The technology can be widely applied in the fields of underground engineering, tunnel reinforcement, reservoir dam reinforcement, rock mass leakage treatment, mine roadway support, etc. The present application provides a new solution for the optimization design and scientific evaluation of rock mass grouting technology by system integration of multifunctional device and innovative test method. The present application accurately masters the flow characteristics in complex fracture environment by dynamically monitoring the seepage pressure and slurry diffusion behavior at each position in the fracture network. The present application reveals the influence law of temperature on the performance of slurry and plugging effect by simulating the grouting process under different temperature conditions. The present application converts the real-time evolution process of fracture network permeability by monitoring the flow through the mass flow sensor 21, and then realizes the real-time and accurate response of the plugging effect. The present application improves the observation accuracy by using high-resolution camera 16 and adjustable light source, and obtains the quasi-three-dimensional image of slurry diffusion in the fracture. The present application tests the anti-scouring ability of the plugging area under high flow rate conditions after plugging is completed, quantifies the mass of scouring and falling off through the change of outlet waste liquid mass and slurry composition analysis, and evaluates the long-term stability of the plugging effect according to the change of permeability and pressure before and after scouring.

[0086] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the present application.

Claims

1. A temperature-controlled fracture network grouting experiment device, characterized in that, The experimental device comprises: a transparent fracture model formed by an upper cover surface and a fracture network, wherein the upper cover surface is provided with a grouting hole, and a water stop structure is arranged around the upper cover surface and the fracture network; an array distributed thin sheet pressure sensor arranged below the fracture network and used for monitoring the change of the seepage pressure at each position in the fracture of the transparent fracture model; a double-liquid grouting system connected with the inlet of the transparent fracture model and used for injecting slurry into the fracture of the transparent fracture model; a camera arranged above the transparent fracture model and used for monitoring the grouting process of the transparent fracture model; a constant-pressure dynamic water injection system connected with the transparent fracture model and used for injecting water flow into the transparent fracture model at a constant pressure; a temperature control system arranged outside the transparent fracture model and used for simulating the grouting environment in a high-temperature or cold region; wherein the temperature control system comprises circulating water pipes arranged around and below the fracture of the transparent fracture model, and high and low temperature circulating pumps connected with the inlet and outlet of the circulating water pipes; the water stop structure comprises an inlet cavity arranged on one side of the upper cover surface and the fracture network, and an outlet cavity arranged on the other side of the upper cover surface and the fracture network, left and right acrylic side strips arranged on the two sides of the upper cover surface and the fracture network, and upper, lower, front, rear and left and right acrylic clamps arranged on the outer side of the upper cover surface and the fracture network; the double-liquid grouting system comprises a plunger pump A, a plunger pump B, a three-way valve and a static mixer, the plunger pump A and the plunger pump B are connected to the three-way valve through a grouting pipeline, the three-way valve is connected to the static mixer through a grouting pipeline, the static mixer is connected to the grouting hole of the transparent fracture model through a grouting pipeline, and a pressure sensor is arranged on the grouting pipeline between the static mixer and the grouting hole; the experimental device further comprises flat light sources one and two arranged above the transparent fracture model and used for lighting the transparent fracture model; the experimental device further comprises a support system, the support system comprises a stage, vertical support rods one and two fixed on the stage, and fixed blocks one and two arranged on the vertical support rods one and two, a horizontal support rod one arranged on the fixed block one, the camera mounted on the horizontal support rod one, and horizontal support rods two and three arranged on the fixed block two, and the flat light sources one and two are mounted on the horizontal support rods two and three, respectively.

2. The temperature-controlled fracture network grouting experimental device according to claim 1, characterized in that, the constant-pressure dynamic water injection system comprises a marple bottle, a lifting table and a mass flow sensor, the marple bottle is placed on the lifting table, the marple bottle is connected with the grouting hole of the transparent fracture model through a pipeline, the mass flow sensor is arranged on the pipeline between the marple bottle and the grouting hole, the outlet of the transparent fracture model is connected with a waste liquid bottle through a pipeline, and the waste liquid bottle is placed above a high-precision electronic scale.

3. The temperature-controlled fracture network grouting experimental device of claim 1, wherein, the experimental device further comprises a waste liquid recovery bottle and an analysis system, the waste liquid recovery bottle and the analysis system comprise a test tube and a liquid chromatograph, and are used for taking an appropriate amount of waste liquid from the test tube and analyzing the composition of the slurry by using the liquid chromatograph.

4. The experimental method of claim any one of claims 1-3, wherein, The experimental method comprises the following steps: Open the high-low temperature circulating pump, set the temperature around the fissure of the transparent fissure model, and after uniform and stable, open the valve of the marshall bottle, the fluid will flow out from the marshall bottle, pass through the transparent fissure model and flow into the waste liquid bottle; When the fluid passes through the transparent fissure model, the permeation pressure change at each place in the fissure is obtained through the array distributed sheet pressure sensor, and the mass flow of the fluid is recorded through the mass flow sensor and high-precision electronic scale; After the transparent fissure model is saturated and the liquid flow is stable, open the camera, flat light source one and flat light source two to record the slurry diffusion process in real time, record the injection pressure change through the pressure sensor, then open the plunger pump A and plunger pump B to inject two kinds of solutions respectively at the set flow rate, the two kinds of solutions are mixed in the static mixer and then injected into the transparent fissure model through the injection hole, after reaching the set pressure or flow rate, close the plunger pump A and plunger pump B; Replace the new waste liquid bottle, take the appropriate amount of waste liquid from the new waste liquid bottle with a test tube at regular intervals to analyze the slurry composition with a liquid chromatograph, and quantify the mass of the washed and fallen solids; After washing to the set time, close all instruments, and the test is finished.

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