Detachable soil body grouting simulation test device

Abstract

The utility model discloses a detachable soil body grouting simulation test device, and belongs to the technical field of grouting simulation test devices, the detachable soil body grouting simulation test device comprises a soil body simulation module, the top and the bottom of the soil body simulation module are respectively provided with a top fixing module and a bottom fixing module, a through hole is formed in the middle of the top fixing module, a grouting pipe used for grouting the interior of the soil body simulation module is arranged at the through hole, the end, away from the soil body simulation module, of the grouting pipe is connected with the grout supply module, and a data acquisition system is arranged between the soil body simulation module and the grout supply module. The device has the advantages of convenience in assembly and disassembly, reusability, real-time observation, simplicity, convenience and practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of grouting simulation test devices, and particularly relates to a detachable soil body grouting simulation test device. Background Technique

[0002] During the on-site grouting construction process, the flow of the grout is inside the medium to be grouted, and it is very difficult to observe the movement and distribution of the grout. The concealment and uncertainty are the greatest characteristics of the grouting project. This makes the grouting design and construction have a great degree of blindness and limitations, and the mechanical properties of the solidified body cannot be well determined. In order to better predict the movement of the grout in the medium to be grouted and determine the mechanical properties of the solidified body, grouting tests are required, and grouting test devices are needed for this purpose.

[0003] In grouting design and construction, empirical formulas and empirical methods are usually adopted, and it is very difficult to predict and control the grouting process. In recent years, there have been many studies on the grout for stratum grouting reinforcement and grouting methods, and there have also been some studies on the test devices for predicting the grouting process and process control research. At present, there has also been a certain development in the research on soil body grouting test devices, but there are some defects, and it is difficult to solve the problems of predicting the movement of the grout in the medium to be grouted and determining the mechanical properties of the solidified body.

[0004] Therefore, it is necessary to provide a detachable soil body grouting simulation test device to solve the above problems. Content of the Utility Model

[0005] Aiming at the deficiencies of the existing technology, the purpose of the embodiment of the utility model is to provide a detachable soil body grouting simulation test device to solve the problems in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A detachable soil body grouting simulation test device includes a soil body simulation module. A top fixing module and a bottom fixing module are respectively arranged at the top and bottom of the soil body simulation module. A through hole is arranged in the middle of the top fixing module. A grouting pipe for grouting into the soil body simulation module is arranged at the through hole. One end of the grouting pipe far away from the soil body simulation module is connected to a grout supply module. A data acquisition system is arranged between the soil body simulation module and the grout supply module.

[0008] As a further scheme of the utility model, the soil body simulation module is formed by butting two mutually cooperating semi-cylindrical walls, and the middle part of the outer side of the semi-cylindrical wall is fixed by a hoop.

[0009] As a further scheme of the utility model, the grout supply module includes an air compressor, a grouting pump and a grouting tank.

[0010] As a further solution of the present utility model, the grouting tank is made of visual tempered glass. One end of the grouting tank close to the soil simulation module is connected with a valve, and a pressure regulating valve is arranged between the grouting tank and the soil simulation module.

[0011] As a further solution of the present utility model, the data acquisition system includes a pressure gauge and a flowmeter. The pressure gauge is installed on the grouting tank, and the flowmeter is installed at the grouting pipe.

[0012] In summary, the embodiments of the present utility model have the following beneficial effects compared with the prior art:

[0013] The present utility model adopts a convenient and assembled manner. On the premise of ensuring reusable, after the grouting simulation is completed, the device can be quickly disassembled, which is convenient for observing the diffusion of the grouted body and sampling for mechanical property testing. By using a grouting pump made of visual tempered glass, it is convenient for real-time observation during the grouting process, and has the effects of convenient assembly, quick disassembly, reusable, real-time observation, simple and practical.

[0014] To more clearly elaborate the structural features and functions of the present utility model, the following combines the drawings with specific embodiments to detail the present utility model. Description of the Drawings

[0015] Figure 1 It is a structural schematic diagram of a detachable soil grouting simulation test device in an embodiment of the utility model.

[0016] Figure 2 It is a structural schematic diagram of a soil simulation module in an embodiment of the utility model.

[0017] Figure 3 It is an exploded view of a soil simulation module in an embodiment of the utility model.

[0018] Reference numerals: 1 - soil simulation module, 2 - bottom fixing module, 3 - top fixing module, 4 - through hole, 5 - grouting pipe, 6 - semi-cylindrical wall, 7 - hoop, 8 - slurry supply module, 9 - air compressor, 10 - grouting pump, 11 - valve, 12 - pressure regulating valve, 13 - data acquisition system, 14 - pressure gauge, 15 - flowmeter. Detailed Embodiments

[0019] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0020] The following describes the specific implementation of the present utility model in detail in conjunction with specific embodiments.

[0021] In an embodiment of the present utility model, refer to Figure 1 、 Figure 2 and Figure 3 , the detachable soil body grouting simulation test device includes a soil body simulation module 1. A top fixing module 3 and a bottom fixing module 2 are respectively arranged at the top and bottom of the soil body simulation module 1. A through hole 4 is arranged in the middle of the top fixing module 3, and a grouting pipe 5 for grouting into the soil body simulation module 1 is arranged at the through hole 4.

[0022] In this embodiment, the soil body simulation module 1 is formed by butting two mutually cooperating semi-cylindrical walls 6, and the middle part of the outer side of the semi-cylindrical wall 6 is fixed by a circular hoop 7; one end of the grouting pipe 5 far from the soil body simulation module 1 is connected to a slurry supply module 8. The slurry supply module 8 includes an air compressor 9, a grouting pump (not shown in the figure) and a grouting tank 10; the grouting tank 10 is made of visual tempered glass to facilitate observing the consumption of the slurry. One end of the grouting tank 10 close to the soil body simulation module 1 is connected with a valve 11, and a pressure regulating valve 12 for controlling the grouting pressure is arranged between the grouting tank 10 and the soil body simulation module 1; a data acquisition system 13 is arranged between the soil body simulation module 1 and the slurry supply module 8. The data acquisition system 13 includes a pressure gauge 14 and a flow meter 15. The pressure gauge 14 is installed on the grouting tank 10 to observe the change of pressure during the grouting process, and the flow meter 15 is installed at the grouting pipe 5, mainly used for collecting during the grouting process.

[0023] Specifically:

[0024] (1) Determine the grouting parameters before starting. The method adopted in the simulated grouting test in this study is static pressure infiltration grouting in the whole hole section; before grouting, the grouting pipe 5 is buried into the soil to be grouted, and the through hole 4 and the grouting pipe 5 are sealed to prevent the slurry from flowing out of the through hole during the grouting process. The total length of the grouting pipe 5 is 0.7 m, the perforated pipe part is located in the middle, with a length of 0.5 m, and the spacing of the perforated pipes is 50 mm; the main technical parameters of the air compressor 9 are as follows: model: OTS-550, nominal volume flow: 40 L / min, rated pressure: 0.7 MPa, rotational speed: 1380 r / min, overall dimensions: 56×24×57 cm; the volume of the air storage tank: 18 L; the size of the grouting pump is: 30 mm (diameter)×50 mm (height), and the grouting pump is provided with an air inlet and a slurry outlet, etc.; the grouting pressures are 0.15 MPa, 0.20 MPa and 0.25 MPa respectively, and the grouting volumes are 15 L, 20 L and 25 L respectively, with three groups for orthogonal tests. The slurry used is ordinary Portland cement slurry with a water-cement ratio of 1:1;

[0025] (2) Experimental preparation: After assembling the soil simulation module 1, carry out model processing, slurry materials, sand for testing, check the tightness of both ends of the high-pressure hose, air pressure pipe and the circuit of the air compressor 9, etc.;

[0026] (3) Loading the model: The preparation of the sand sample in the test adopts the layered compaction method; among them, the compaction steps are as follows: Weigh a certain amount of sand sample, pour it into the compaction bucket, and carry out compaction. The height of each layer of sample should be equal, and the interface between two layers should be scarified;

[0027] (4) Install the grouting pipe 5 and air pressure pipe, complete the grouting pipeline, connect the pressure gauge 14 and flowmeter 15, and connect all devices; Grout, prepare the slurry according to the ratio, pour the stirred slurry into the grouting tank 10, quickly seal the grouting tank 10, turn on the air compressor 9, adjust it to the set pressure and observe the reading of the pressure gauge 14 on the grouting tank 10 to control the pressure. After the pressure is stable, open the grouting valve 11 to grout, observe the reading of the flowmeter 15, and close the grouting valve 11 when the set grouting volume is reached to stop the test;

[0028] (5) Take soil samples. One day after the grouting is completed, wait for the slurry to solidify and harden before taking soil samples; Sampling is carried out according to the geotechnical test methods and specification regulations; During the sampling process, the layered excavation method is used to reach the set position of the test point: In the whole plane, excavate 1 - 2 cm downward each time, be careful and meticulous to avoid disturbing the soil sample. Take 5 direct shear samples with a diameter of 61.5 mm and a height of 20 mm, 2 permeability samples with a diameter of 61.5 mm and a height of 40 mm, and 8 compressive and tensile samples of 40 mm × 40 mm × 40 mm at each part, and conduct strength and permeability tests respectively; Due to different grouting volumes, different diffusion distances and reinforcement depths, sampling is carried out according to the specific reinforcement situation; When removing the model, observe the diffusion and forming shape of the slurry, take pictures and measure the sample size; Record and analyze the experimental data.

[0029] Compared with the prior art, the beneficial effect of the present application is that the soil simulation module 1 adopts a portable and assembled method. On the premise of ensuring reusability, after the grouting simulation is completed, the device can be quickly disassembled, which is convenient for observing the diffusion of the grouted body and sampling for mechanical property testing; At the same time, the grouting tank 10 in the present application is made of a visual material, which is convenient for real-time observation during the grouting process.

[0030] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A detachable soil grouting simulation test device, comprising a soil simulation module, characterized in that: The top and bottom of the soil simulation module are respectively provided with a top fixing module and a bottom fixing module, a through hole is provided in the middle of the top fixing module, a grouting pipe for grouting into the interior of the soil simulation module is provided at the through hole, the end of the grouting pipe away from the soil simulation module is connected to the slurry supply module, and a data acquisition system is provided between the soil simulation module and the slurry supply module.

2. The detachable soil grouting simulation test device according to claim 1 is characterized in that: The soil simulation module is formed by butting two mutually matching semi-cylindrical walls, and the middle part of the outer side of the semi-cylindrical wall is fixed by a circular hoop.

3. The detachable soil grouting simulation test device according to claim 1 is characterized in that: The slurry supply module comprises an air compressor, a grouting pump and a grouting tank.

4. The detachable soil grouting simulation test device according to claim 3 is characterized in that: The grouting tank is made of visualized tempered glass, one end of the grouting tank close to the soil simulation module is connected with a valve, and a pressure regulating valve is arranged between the grouting tank and the soil simulation module.

5. The detachable soil grouting simulation test device according to claim 1 is characterized in that: The data acquisition system comprises a pressure gauge and a flow meter, wherein the pressure gauge is installed on the grouting tank and the flow meter is installed on the grouting pipe.

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