Test device for evaluating grouting performance of water glass under different stress states and flowing water conditions

Abstract

The invention provides a test device for evaluating the grouting performance of water glass under different stress states and flowing water conditions. The test device is composed of a flowing water simulation system, a loading control system, a grouting system and a main body structure. In the test, the flowing water flow velocity is changed through the height adjusting device, and a square flange oil cylinder on the main body structure controls displacement loading to form a stress field in the rock-soil body. The grouting performance of the water glass is evaluated by observing and recording the condensation state and the water plugging time of the water glass grouting at different flowing water flow speeds. The test device has the advantages that the structure is simple, the operation is convenient, the grouting result is visual, the test effect is better, multiple parameter orthogonal tests can be carried out, and certain innovativeness and practicability are achieved for evaluating the water glass grouting performance in the dynamic water environment.

Description

Technical Field

[0001] The invention relates to the field of performance testing of underground engineering stratum grouting materials, and in particular to a testing device capable of evaluating water glass grouting performance under different stress states and dynamic water conditions. Background Art

[0002] In the mountainous areas and karst areas in the central and western regions where the geological environment is extremely complex, there are widespread water-rich, broken and fissured strata, which poses a huge challenge to the construction of tunnels and underground projects. Among them, water and mud inrush disasters, as one of the most serious geological disasters, not only threaten construction safety, but may also lead to construction delays, economic losses and even environmental damage. Therefore, how to effectively deal with water-rich, broken and fissured strata has become a key issue that needs to be urgently addressed in the field of tunnels and underground projects.

[0003] In water-rich fractured and fissured strata, grouting technology is widely used in disaster management of tunnels and underground projects because of its advantages of effectively filling cracks, improving stratum strength, and reducing groundwater infiltration. Grouting materials are the core of grouting technology, and their performance is directly related to the management effect. As a commonly used grouting material, water glass has a chemical composition of mainly Na2SiO3·9H2O, and has the advantages of strong bonding, high strength, acid resistance, and good heat resistance. However, in water-rich and fractured strata, the performance of water glass grouting materials is significantly affected by stress and dynamic water conditions.

[0004] At present, the evaluation of grouting material performance still faces many challenges. In particular, there is a lack of suitable test equipment for the performance evaluation of grouting materials such as water glass under different stress and dynamic water conditions. Existing test equipment mostly focuses on performance testing under static conditions, which is difficult to simulate the complex environment in actual engineering. Based on the above shortcomings, the present invention designs a water glass grouting performance evaluation test device that can simulate stress and dynamic water conditions. Summary of the invention

[0005] The purpose of the present invention is to provide a test device for testing the grouting condensation performance of water glass materials under different stresses and dynamic water flow rates, aiming to achieve the water glass condensation performance test under different stresses and dynamic water velocity conditions by changing the head height and the pressure loading device.

[0006] The object of the present invention is achieved in this way: a test device that can realize the water glass grouting performance test under different stress states and dynamic water conditions, mainly comprising: a dynamic water simulation system composed of a water pump, a guide pipe, a water storage tank, a height adjustment device, a valve, and a flow meter, a loading control system composed of a reaction frame, a flange oil cylinder, and a loading plate, a main structure composed of a tempered glass plate, a steel bottom plate, a water outlet orifice plate, and an earth pressure gauge, a grouting system composed of a grouting pump, a valve, a pressure regulating device, a grouting pressure gauge, and a grouting pipe, and a waste liquid collection box; the guide pipe in the dynamic water simulation system is connected to the tempered glass plate in the main structure, the loading control system is placed on the main structure, and the grouting pipe in the grouting system is connected to the tempered glass plate in the main structure.

[0007] Furthermore, the dynamic water simulation system consists of a water pump, a guide pipe, a water tank, a height adjustment device, a valve, and a flow meter, and the connection relationship is: the water pump is connected to the water tank through the guide pipe, the guide pipe coming out of the water tank is provided with a valve and a flow meter, and the height adjustment device is a triangular telescopic frame placed under the water tank.

[0008] Furthermore, the loading control system is composed of multiple reaction frames, multiple flange cylinders and loading plates, and the connection relationship is: the flange cylinder is placed under the reaction frame, there are two flange cylinders placed under the reaction frame, and multiple reaction frames are placed above the loading plate.

[0009] Furthermore, the main structure is composed of a tempered glass plate, a steel bottom plate, a water outlet plate, and an earth pressure gauge, and the connection relationship is: the tempered glass plate is a block connected with the water outlet plate to form the side wall of the pool-like structure, which is combined with the steel bottom plate to form a pool-like structure.

[0010] Furthermore, the grouting system consists of a grouting pump, a valve, a pressure regulating device, a grouting pressure gauge, and a grouting pipe, and the connection relationship is: the grouting pump is connected to the pool side of the main structure through the grouting pipe, and the valve, pressure regulating device and grouting pressure gauge are high-mounted on the grouting pipe.

[0011] Beneficial effects of the present invention: 1. The test device of the present invention is implemented by a dynamic water simulation system, a loading control system, a main structure and a grouting system for the performance of water glass grouting under different stress and dynamic water conditions. In the test, the dynamic water flow rate is changed by a height adjustment device, and the displacement loading is controlled by the flange cylinder above the main structure to form a stress field inside the rock and soil. The grouting performance of water glass is evaluated by observing and recording the coagulation state and water blocking time of water glass grouting under different dynamic water flow rates.

[0012] 2. This test device can adjust the flow rate of dynamic water by changing the water head height of the water tank; different stress environments can be achieved through the loading device on the top.

[0013] 3. The side walls of the main structure of this test device are made of transparent tempered glass plates to visualize the water glass grouting condensation process.

[0014] 4. Through multiple tests, the corresponding relationship between the setting time of water glass and the dynamic water velocity can be obtained, which can be used as a parameter to evaluate the performance of water glass grouting.

[0015] In general, the test device of the present invention is simple to operate, the results are intuitive, the effect is good, and it has certain innovation and practicality for evaluating the water glass grouting performance in a dynamic water environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the test device of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the stress loading device of the present invention.

[0019] In the figure: 1-water pump, 2-flow guide pipe, 3-water storage tank, 4-height adjustment device, 5-valve, 6-flow meter, 7-reaction frame, 8-flange cylinder, 9-loading plate, 10-tempered glass plate, 11-steel bottom plate, 12-water outlet plate, 13-earth pressure gauge, 14-grouting pump, 15-valve, 16-pressure regulating device, 17-grouting pressure gauge, 18-grouting pipe, 19-waste liquid collection box. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Example

[0021] like Figure 1-2As shown, a test device for testing the performance of water glass grouting under different stress states and dynamic water conditions mainly comprises: a dynamic water simulation system composed of a water pump 1, a guide pipe 2, a water storage tank 3, a height adjustment device 4, a valve 5, and a flow meter 6, a loading control system composed of a reaction frame 7, a flange cylinder 8, and a loading plate 9, a main structure composed of a tempered glass plate 10, a steel bottom plate 11, a water outlet orifice plate 12, and an earth pressure gauge 13, a grouting system composed of a grouting pump 14, a valve 15, a pressure adjustment device 16, a grouting pressure gauge 17, and a grouting pipe 18, and a waste liquid collection box 19; the guide pipe 2 in the dynamic water simulation system is connected to the tempered glass plate 10 in the main structure, the loading control system is placed on the main structure, the grouting pipe 18 in the grouting system is connected to the tempered glass plate 10 in the main structure, and the liquid in the test device flows into the waste liquid collection box 19 through the water outlet orifice plate 12.

[0022] Preferably, the dynamic water simulation system consists of a water pump 1, a guide pipe 2, a water tank 3, a height adjustment device 4, a valve 5, and a flow meter 6, and the connection relationship is: the water pump 1 is connected to the water tank 3 through the guide pipe 2, the guide pipe 2 coming out of the water tank 3 is provided with a valve 5 and a flow meter 6, and the height adjustment device 4 is a triangular telescopic frame placed under the water tank 3.

[0023] The water storage tank 3 is installed on the top of the supporting structure. The water head height is changed by the height adjustment device 4. After the valve 5 is opened, the dynamic water flow rate can be observed in the flow meter 6 and adjusted in real time. The external water source forms a stable liquid level in the water storage tank 3 through the guide pipe 2 through the water pump 1.

[0024] Preferably, the loading control system is composed of a plurality of reaction frames 7, a plurality of flange oil cylinders 8, and a loading plate 9, and the connection relationship is as follows: the flange oil cylinder 8 is placed below the reaction frame 7, there are two flange oil cylinders 8 placed below the reaction frame 7, and a plurality of reaction frames 7 are placed above the loading plate 9. By using the movable loading plate 9, flange oil cylinder 8, and reaction frame 7, vertical soil pressure can be applied to the formation material.

[0025] Preferably, the main structure is composed of a tempered glass plate 10, a steel bottom plate 11, a water outlet plate 12, and an earth pressure gauge 13, and the connection relationship is as follows: the tempered glass plates 10 are three pieces connected with the water outlet plate 12 to form the side wall of the pool-like structure, which is combined with the steel bottom plate 11 to form the pool-like structure. The earth pressure gauge 13 can monitor the change of stress in real time, and the three sides of the main structure adopt tempered glass plates 10, which is convenient for observing the condensation effect of water glass grouting.

[0026] Preferably, the grouting system is composed of a grouting pump 14, a valve 15, a pressure regulating device 16, a grouting pressure gauge 17, and a grouting pipe 18, and the connection relationship is as follows: the grouting pump 14 is connected to the pool side of the main structure through the grouting pipe 18, and the valve 15, the pressure regulating device 16 and the grouting pressure gauge 17 are placed high on the grouting pipe 18. The grouting pressure of the grouting pump 14 can be adjusted by the pressure regulating device 16, and can be observed in real time on the grouting pressure gauge 17.

[0027] Installation and working principle: (1) First, based on Figure 1 The components of the test device are installed as shown, connecting the guide pipe 2 and the grouting pipe 18, ensuring that the water pump 1 and the grouting pump 14 are in the closed state, and the liquid pipe valves 5 and 15 are tightly closed.

[0028] (2) Add an appropriate amount of test rock and soil into the internal space of the main structures 10 and 11, install the loading plate 9, flange cylinder 8 and reaction frame 7 at the reserved position of the structure, and ensure that the flange cylinder acts vertically on the upper part of the structure. Then control the flange cylinder 8 to load the corresponding stroke, apply a stable stress field to the rock and soil, observe the internal soil pressure gauge 13, and withdraw the loading device after the stress value stabilizes.

[0029] (3) Turn on the water pump 1 to make the liquid level in the water storage tank 3 exceed the diversion pipe 2. After it stabilizes, open the valve 5 to allow the dynamic water to seep through the cracks in the rock and soil and flow into the waste liquid collection tank 12 through the outlet orifice plate. After observing that the reading of the flow meter 6 is stable, adjust the height adjustment device 4 so that the dynamic water flow rate reaches the predetermined value of the test.

[0030] (4) Open the grouting pump 14 and valve 15, adjust the pressure regulating device 16, observe the grouting pressure gauge 17, and make the grouting pressure reach the predetermined value of the test. The water glass is poured into the rock and soil through the grouting pipe 18 and the grouting port.

[0031] (5) Start timing after grouting begins. Stop timing when no moving water flows out of the outlet orifice plate 12, and the test is completed.

[0032] (6) The test is conducted by adjusting the height of the water storage tank 3 multiple times to change the dynamic water flow rate. The corresponding grouting water blocking time can be used to evaluate the condensation performance of water glass.

[0033] The grouting performance of water glass was evaluated by observing and recording the setting state of water glass grouting and the water blocking time used under different dynamic water flow rates.

Claims

1. A water glass grouting performance test device under different stress states and dynamic water conditions, characterized by: Mainly include: A dynamic water simulation system consisting of a water pump (1), a flow guide pipe (2), a water storage tank (3), a height adjustment device (4), a valve (5), and a flow meter (6); a loading control system consisting of a reaction frame (7), a flange oil cylinder (8), and a loading plate (9); a main structure consisting of a tempered glass plate (10), a steel bottom plate (11), a water outlet orifice plate (12), and an earth pressure gauge (13); a grouting system consisting of a grouting pump (14), a valve (15), a pressure adjustment device (16), a grouting pressure gauge (17), and a grouting pipe (18); and a waste liquid collection box (19); the flow guide pipe (2) in the dynamic water simulation system is connected to the tempered glass plate (10) in the main structure; the loading control system is placed on the main structure; and the grouting pipe (18) in the grouting system is connected to the tempered glass plate (10) in the main structure.

2. The test device for evaluating water glass grouting performance under different stress states and dynamic water conditions according to claim 1, characterized in that: The dynamic water simulation system comprises a water pump 1, a flow guide pipe (2), a water storage tank (3), a height adjustment device (4), a valve (5), and a flow meter (6), and the connection relationship thereof is as follows: the water pump (1) is connected to the water storage tank (3) via the flow guide pipe (2), the flow guide pipe (2) coming out of the water storage tank (3) is provided with a valve (5) and a flow meter (6), and the height adjustment device (4) is a triangular telescopic frame placed below the water storage tank (3).

3. The test device for evaluating water glass grouting performance under different stress states and dynamic water conditions according to claim 1, characterized in that: The loading control system is composed of a plurality of reaction frames (7), a plurality of flange oil cylinders (8), and a loading plate (9), and the connection relationship thereof is as follows: the flange oil cylinder (8) is placed below the reaction frame (7), there are two flange oil cylinders (8) placed below the reaction frame (7), and a plurality of reaction frames (7) are placed above the loading plate (9).

4. The test device for evaluating water glass grouting performance under different stress states and dynamic water conditions according to claim 1, characterized in that: The main structure is composed of a tempered glass plate (10), a steel bottom plate (11), a water outlet plate (12), and an earth pressure gauge (13), and the connection relationship thereof is as follows: the tempered glass plates (10) are three pieces connected with the water outlet plate (12) to form the side wall of the pool-like structure, which is combined with the steel bottom plate (11) to form the pool-like structure.

5. The test device for evaluating water glass grouting performance under different stress states and dynamic water conditions according to claim 1, characterized in that: The grouting system comprises a grouting pump (14), a valve (15), a pressure regulating device (16), a grouting pressure gauge (17), and a grouting pipe (18), and the connection relationship thereof is as follows: the grouting pump (14) is connected to the pool side of the main structure via the grouting pipe (18), and the valve (15), the pressure regulating device (16), and the grouting pressure gauge (17) are placed high on the grouting pipe (18).

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