A device for measuring stress change of soil mass after grouting

Abstract

The present application relates to the technical field of soil measurement, and discloses a device for measuring stress change of soil after grouting. The device comprises a cylinder assembly for containing soil to be measured, a load applying assembly for applying load to the soil to be measured, a plurality of grouting assemblies for grouting the soil to be measured at different positions, and a plurality of soil monitoring assemblies for measuring stress change of the soil to be measured at different positions after grouting. The cylinder assembly comprises a base and a cylinder, and the bottom end of the cylinder is sealingly installed on the base. The load applying assembly is arranged at the top end of the cylinder and can apply load to the soil to be measured along the axial direction of the cylinder. One end of the grouting assembly is arranged inside the cylinder, and the other end is arranged outside the cylinder. The device can measure various data of the soil under different grouting forms by monitoring the soil after grouting and load applying.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of soil measurement, and particularly relates to a device for measuring stress change of soil after grouting. BACKGROUND

[0002] With the increasing application of grouting technology in the lifting and repair of buildings and structures, the stress change of the soil inside the soil during the lifting process after grouting needs to be accurately measured.

[0003] In the simulation experiment process, the soil of single-hole grouting is often measured, and no load is applied to the soil. However, in actual engineering, the soil is subjected to multi-hole grouting, and the soil is necessarily subjected to load. Therefore, it is necessary to measure the stress change of the soil under the condition of multi-hole grouting and load application.

[0004] In addition, the existing device cannot monitor the stress change of the internal soil during the lifting process of the soil, which makes the measured data too single and the cognition of the grouting lifting not deep enough. SUMMARY

[0005] The purpose of the present application is to provide a device for measuring stress change of soil after grouting, so as to provide measurement results of various data of soil under different grouting forms.

[0006] To achieve this purpose, the present application adopts the following technical scheme:

[0007] A device for measuring stress change of soil after grouting, comprising a cylinder assembly, a grouting assembly, a load application assembly and a soil monitoring assembly. The cylinder assembly is used to contain the soil to be measured, and the cylinder assembly comprises a base and a cylinder, and the cylinder is sealingly mounted on the base. The grouting assembly is used to grout the soil to be measured, and the grouting assembly is provided with a plurality of grouting assemblies, and the plurality of grouting assemblies are arranged at different positions of the cylinder. The load application assembly is arranged at the top end of the cylinder, and the load application assembly applies load to the soil to be measured along the axial direction of the cylinder. The soil monitoring assembly is used to monitor the stress change of the soil to be measured, and the soil monitoring assembly is provided with a plurality of soil monitoring assemblies, and the plurality of soil monitoring assemblies are arranged at different positions in the cylinder.

[0008] Among them, the grouting assembly comprises an air bag and a grouting hose, one end of the grouting hose is arranged in the cylinder, and the end of the grouting hose is connected to the air bag.

[0009] Further, the grouting hose is sealingly connected with the side wall of the cylinder.

[0010] Preferably, the bottom end and the top end of the cylinder are both provided with a water permeable plate, and the outer diameter of the water permeable plate is the same as the inner diameter of the cylinder.

[0011] Further, a plurality of water-permeable holes are arranged on the water-permeable plate, and a protrusion is arranged on the side of the water-permeable plate away from the soil body to be measured.

[0012] Preferably, the load applying assembly comprises a pressure transmission plate, a pressure transmission shaft and a displacement sensor, the pressure transmission plate is installed at the top end of the cylinder body, the pressure transmission shaft is arranged on the pressure transmission plate and used for applying a load to the pressure transmission plate, and the displacement sensor is installed on the pressure transmission shaft and used for measuring the relative displacement of the pressure transmission shaft after the soil body to be measured is grouted.

[0013] Preferably, the soil body monitoring assembly comprises a stress sensor, and the stress sensor is communicatively connected to a receiver arranged outside the cylinder body through a connecting line.

[0014] Preferably, a plurality of water outlet holes are arranged on the base, and a drainage monitoring assembly is connected to the water outlet holes, and the drainage monitoring assembly is used for measuring the drainage amount and pore water pressure of the soil body to be measured.

[0015] Further, the drainage monitoring assembly comprises a pore water pressure sensor, which is used for monitoring the pore water pressure at the water outlet holes.

[0016] Further, the drainage monitoring assembly comprises a water storage unit, which is in communication with the water outlet holes, and a differential pressure sensor for measuring the liquid level is arranged on the water storage unit.

[0017] Advantages of the present application:

[0018] The plurality of grouting assemblies and the load applying assembly can complete the grouting and load applying operations on the soil body to be measured contained in the cylinder body assembly, and the soil body monitoring assembly can realize the measurement of the soil body stress of the soil body to be measured at different positions under different grouting forms, so that the measurement of various data of the soil body under different grouting forms is completed, and the test results are closer to the data of actual engineering applications. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the device for measuring the stress change of the soil body after grouting provided by the embodiment of the present application;

[0020] Figure 2 is a structural schematic diagram of the water-permeable plate provided by the embodiment of the present application.

[0021] In the drawings:

[0022] 1, base; 2, pore water pressure sensor; 3, differential pressure sensor; 4, water-permeable plate; 41, protrusion; 42, water-permeable hole; 5, cylinder body; 6, connecting line; 7, stress sensor; 8, water outlet hole; 9, air bag; 10, pressure ring; 11, grouting hose; 12, pressure transmission plate; 13, displacement sensor; 14, pressure transmission shaft. DETAILED DESCRIPTION

[0023] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0024] In the description of the present application, unless explicitly defined and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrated; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the present application, unless explicitly defined and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0026] The technical solutions of the present application will be further described below with reference to the drawings and through specific embodiments.

[0027] As Figure 1 and Figure 2As shown, the device for measuring stress change of soil after grouting provided by the embodiment comprises a cylinder assembly, a grouting assembly, a load applying assembly and a soil monitoring assembly. The cylinder assembly is used for containing the soil to be measured, and comprises a base 1 and a cylinder 5, wherein the cylinder 5 is sealingly installed on the base 1. The grouting assembly is used for grouting the soil to be measured, and a plurality of grouting assemblies are arranged at different positions of the cylinder 5. The load applying assembly is arranged at the top end of the cylinder 5, and the load applying assembly applies load to the soil to be measured along the axial direction of the cylinder 5. The soil monitoring assembly is used for monitoring the stress change of the soil to be measured, and a plurality of soil monitoring assemblies are arranged at different positions in the cylinder 5. The plurality of grouting assemblies and the load applying assembly can complete the grouting and load applying operations at multiple positions of the soil to be measured contained in the cylinder assembly. Then, the soil monitoring assembly can realize the measurement of the soil stress of the soil to be measured at different positions under different grouting forms, complete the measurement of various data of the soil under different grouting forms, and make the test results closer to the data of actual engineering application.

[0028] In the embodiment, the grouting assembly comprises an air bag 9 and a grouting hose 11, one end of the grouting hose 11 is arranged in the cylinder 5, and the end of the grouting hose 11 is connected with the air bag 9. The arrangement of the grouting hose 11 enables the operator to complete the grouting operation on the air bag 9 arranged at any position in the cylinder 5 outside the cylinder 5. In the embodiment, a plurality of grouting ports are arranged at different positions of the side wall of the cylinder 5, and the grouting hose 11 is arranged at each grouting port to simulate different grouting forms.

[0029] Further, the grouting hose 11 is sealingly connected with the side wall of the cylinder 5, so that the soil to be measured cannot leak out from the connection between the side wall of the cylinder 5 and the grouting hose 11, thereby avoiding the inaccurate measurement results.

[0030] In the embodiment, the load applying assembly comprises a pressure transmission plate 12, a pressure transmission shaft 14 and a displacement sensor 13, the pressure transmission plate 12 is installed at the top end of the cylinder 5, the pressure transmission shaft 14 is arranged on the pressure transmission plate 12 and used for applying load to the pressure transmission plate 12, and the displacement sensor 13 is installed on the pressure transmission shaft 14 and used for measuring the relative displacement of the pressure transmission shaft 14 after the soil to be measured is grouted. The load applying assembly always applies load to the soil to be measured, thereby ensuring the accuracy of the data of the soil to be measured when the device measures the bearing load. The side of the pressure transmission plate 12 in contact with the pressure transmission shaft 14 is provided with an annular structure, the pressure transmission shaft 14 is inserted into the annular structure, the surface of the pressure transmission plate 12 outside the cylinder 5 is provided with inclined triangular supports in the circumferential direction, the inclined triangular supports extend from the annular structure to the edge of the pressure transmission plate 12, and the arrangement of the inclined triangular supports can make the load applied by the pressure transmission shaft 14 uniformly distributed on the soil to be measured. The relative displacement of the pressure transmission shaft 14 after the soil is grouted, which is measured by the displacement sensor 13, is the soil uplift of the soil to be measured.

[0031] In the embodiment, the cylinder 5 is externally sleeved with a plurality of compression rings 10 installed at different positions. The compression rings 10 are arranged so that the cylinder 5 is not easy to deform when subjected to the pressure of the soil to be measured, thereby protecting the device and ensuring the accuracy of the measurement results.

[0032] The soil monitoring assembly includes a stress sensor 7 which is in communication connection with a receiver arranged outside the cylinder 5 through a connecting line 6. In the embodiment, three soil monitoring assemblies are arranged in the cylinder 5 from top to bottom, so that the soil monitoring assemblies are distributed at any position in the cylinder 5, facilitating the measurement of the stress changes at different positions of the soil.

[0033] In the embodiment, the bottom end and the top end of the cylinder 5 are both provided with a water-permeable plate 4, and the outer diameter of the water-permeable plate 4 is the same as the inner diameter of the cylinder 5. Specifically, the water-permeable plate 4 at the top end of the cylinder 5 is arranged below and in abutment with the pressure transmission plate 12, and the water-permeable plate 4 at the bottom end of the cylinder 5 is arranged above and spaced apart from the base 1. The arrangement of the water-permeable plate 4 separates the water discharged from the soil to be measured from the soil, facilitating further research and analysis of the water discharged from the soil.

[0034] Further, the water-permeable plate 4 is provided with a plurality of water-permeable holes 42, and the side of the water-permeable plate 4 away from the soil to be measured is provided with a protrusion 41. The protrusion 41 leaves a gap between the water-permeable plate 4 and the base 1, and the water discharged from the soil to be measured flows into the gap between the water-permeable plate 4 and the base 1 through the water-permeable holes 42, facilitating the collection of the water discharged from the soil to be measured.

[0035] In the embodiment, the base 1 is provided with a plurality of water outlets 8, and the water outlets 8 are connected with a drainage monitoring assembly for measuring the drainage amount and the pore water pressure of the soil to be measured. The arrangement of the drainage monitoring assembly enriches the types of measurement data of the device, facilitating in-depth research and analysis of the experimental results.

[0036] Preferably, the drainage monitoring assembly includes a pore water pressure sensor 2 for monitoring the pore water pressure at the water outlet 8. The drainage monitoring assembly includes a water storage unit which is in communication with the water outlet 8, and the water storage unit is provided with a differential pressure sensor 3 for measuring the liquid level. The water on the base 1 flows into the water storage unit through the water outlet 8, and the differential pressure sensor 3 is used to measure the drainage amount in the water storage unit, i.e., the soil drainage amount of the soil to be measured during the experiment.

[0037] Obviously, the above embodiments of the present application are merely example for clearly explaining the present application, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A device for measuring stress changes in soil after grouting, characterized in that, include: A cylindrical assembly for holding the soil to be tested, the cylindrical assembly includes a base (1) and a cylindrical body (5), the cylindrical body (5) being sealed and installed on the base (1); Grouting assembly for grouting the soil to be tested, wherein multiple grouting assemblies are provided and the multiple grouting assemblies are arranged at different positions of the cylinder (5); A load application component is disposed at the top of the cylinder (5), and the load application component applies a load to the soil to be tested along the axial direction of the cylinder (5); A soil monitoring component is used to monitor the stress change of the soil to be tested. Multiple soil monitoring components are provided, and the multiple soil monitoring components are set at different positions inside the cylinder (5). The load application assembly includes a pressure plate (12), a pressure shaft (14), and a displacement sensor (13). The pressure plate (12) is installed on the top of the cylinder (5). The pressure shaft (14) is disposed on the pressure plate (12) and is used to apply a load to the pressure plate (12). The displacement sensor (13) is installed on the pressure shaft (14) and is used to measure the relative displacement of the pressure shaft (14) after grouting of the soil to be tested. The bottom and top of the cylinder (5) are both equipped with permeable plates (4), the outer diameter of the permeable plates (4) is the same as the inner diameter of the cylinder (5); the permeable plates (4) are provided with multiple permeable holes (42), and the permeable plates (4) are provided with protrusions (41) on the side away from the soil to be tested. The base (1) is provided with multiple water outlets (8), and the water outlets (8) are connected to a drainage monitoring component. The drainage monitoring component is used to measure the drainage volume and pore water pressure of the soil to be tested. The drainage monitoring component includes a water storage unit, which is connected to the water outlets (8). The water storage unit is provided with a differential pressure sensor (3) for measuring the liquid level.

2. The device for measuring soil stress changes after grouting according to claim 1, characterized in that, The grouting assembly includes an airbag (9) and a grouting hose (11). One end of the grouting hose (11) passes through the cylinder (5) and is placed inside the cylinder (5), and the end of the grouting hose (11) is connected to the airbag (9).

3. The device for measuring soil stress changes after grouting according to claim 2, characterized in that, The grouting hose (11) is sealed to the side wall of the cylinder (5).

4. The device for measuring soil stress changes after grouting according to claim 1, characterized in that, The soil monitoring component includes a stress sensor (7), which is communicatively connected to a receiver located outside the cylinder (5) via a connecting line (6).

5. The device for measuring soil stress changes after grouting according to claim 1, characterized in that, The drainage monitoring component includes a pore water pressure sensor (2) for monitoring the pore water pressure at the outlet (8).

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