Soil shock subsidence on-site test instrument and use method thereof

Abstract

The invention discloses a soil shock subsidence field test instrument and a use method thereof, the soil shock subsidence field test instrument comprises an openable base, the openable base is provided with an air bag, the air bag is provided with an openable top seat, and the air bag is provided with a through hole 1; the test instrument is mounted in the openable top seat and comprises an axial pressure controller, an actuator and a displacement meter; the axial pressure controller, the actuator and the displacement meter are all located in the top seat capable of being opened and closed. The control system is arranged on the top base and provided with a control panel, and the axial pressure controller, the actuator and the displacement meter are all electrically connected with the control system. According to the invention, the complex measurement process is reduced, the disturbance to undisturbed soil is reduced, and the measurement personnel can more conveniently and accurately complete the measurement of the soil seismic subsidence.

Description

Technical Field

[0001] The present invention relates to the technical field of geotechnical engineering, and particularly to an on-site testing instrument for soil seismic subsidence and its using method. Background Art

[0002] Seismic subsidence refers to the sudden excessive and uneven additional settlement that occurs in a site under the action of a strong seismic load, which is most common in soft clay, saturated sand, and silt. This effect is an important cause of building damage during earthquakes. Therefore, when carrying out construction, it is necessary to use appropriate methods to measure the seismic subsidence amount of the site, which is an essential process to reduce the impact of seismic subsidence disasters during the design process.

[0003] Problems of existing measurement methods:

[0004] Regarding the measurement methods of site seismic subsidence, researchers in related fields have conducted certain research and achieved some results. However, there is currently a lack of a direct on-site measurement method for site seismic subsidence. For example, a method that can measure the wave velocity on-site and convert it through the statistical law between the soil wave velocity and soil seismic subsidence has the problem that its measurement accuracy is based on the statistical relationship between the wave velocity and subsidence amount of a specific soil, rather than a direct measurement of the soil seismic subsidence amount. Other measurement methods usually need to combine indoor tests or numerical simulation means to finally determine the residual strain value of the target site. Since it is an indoor test, complex steps are required to take soil samples and prepare the soil samples for measurement. The soil samples are easily disturbed during the sampling and preparation processes, and the required parameters need to be determined through a large number of tests. There is a lack of a simple and effective on-site measurement method, which is restricted to a certain extent in practical engineering applications.

[0005] Therefore, an on-site testing instrument for soil seismic subsidence and its using method are proposed to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to provide an on-site testing instrument for soil seismic subsidence and its testing method to solve the problems existing in the above-mentioned prior art, make up for the deficiency that most of the existing measurements of site seismic subsidence require the combination of indoor tests and complex testing processes, reduce the workload of measuring soil seismic subsidence, and enable relevant personnel to conveniently and quickly conduct relevant test operations on-site to test the seismic subsidence of the soil at the site.

[0007] To achieve the above purpose, the present invention provides the following solution: The present invention provides an on-site testing instrument for soil seismic subsidence, including:

[0008] An openable base, an airbag is installed on the openable base, an openable top seat is installed on the airbag, and the airbag has a through hole 1;

[0009] A testing instrument, which is installed in an openable and closable top seat. The testing instrument includes an axial compression controller, an actuator, and a displacement gauge.

[0010] A control system, which is arranged on the openable and closable top seat. The control system has a control panel. The axial compression controller, the actuator, and the displacement gauge are all electrically connected to the control system.

[0011] Preferably, the openable and closable top seat includes a first seat body and an ellipsoidal outer shell. The first seat body and the ellipsoidal outer shell are detachably connected. An openable and closable first plug board is installed on the first seat body. The axial compression controller, the actuator, and the displacement gauge are installed on the first seat body. The length of the airbag is 20 cm.

[0012] Preferably, the openable and closable base includes a second seat body, which has a second through hole. An openable and closable second plug board is installed on the second seat body.

[0013] A method for using a field testing instrument for soil seismic subsidence includes the following steps:

[0014] Step 1: Open the openable and closable second plug board in the openable and closable base so that the inside of the airbag communicates with the second seat body.

[0015] Step 2: Insert the airbag and the openable and closable base into the soil to be tested. When inserting, the soil to be tested will enter the second through hole of the openable and closable base and also enter the first through hole of the airbag, and press down the instrument to the depth to be tested.

[0016] Step 3: Install the openable and closable top seat on the airbag and open the openable and closable first plug board in the openable and closable top seat so that the openable and closable top seat communicates with the internal space of the airbag, and make the testing instrument, including the axial compression controller, the actuator, and the displacement gauge, fit with the soil to be tested.

[0017] Step 4: Through the control panel, close the openable and closable second plug board in the openable and closable base so that the soil inside the field testing instrument for soil seismic subsidence is separated from the external soil, and make the test only occur in the internal soil to be tested.

[0018] Step 5: Through the control system, input preset information and complete the test steps through its program.

[0019] Preferably,

[0020] The control system inputs preset data through the control panel;

[0021] After the control system receives a preset data input control signal from the control panel, it controls the openable and closable first plug board and the openable second plug board to pop out and close, closing the internal test soil body;

[0022] After receiving the preset data input control signal from the control panel, the control system controls the airbag to set the confining pressure applied to the soil according to the set confining pressure;

[0023] After receiving the preset data input control signal from the control panel, the control system controls the axial pressure controller to apply the axial pressure to the soil according to the set axial pressure;

[0024] After receiving the preset data input control signal from the control panel, the control system controls the actuator to apply vibration to the soil according to the input vibration time history;

[0025] After receiving the control signal from the control panel, the control system controls the displacement gauge to measure the residual strain generated;

[0026] After receiving the measured output data signal from the displacement gauge, the control system transmits the data signal to the control panel;

[0027] For the control system, the control panel performs arithmetic processing on the measured output signal and the input information, and displays it for people to read.

[0028] The present invention discloses the following technical effects: The present invention can realize direct and on-site measurement of the seismic subsidence of the soil to be measured, without relying on the indirect conversion method of statistical laws, reducing the measurement error; nor relying on the complex steps of indoor tests, reducing the complex measurement process, reducing the disturbance to the undisturbed soil, and enabling the measurement personnel to more conveniently and accurately complete the measurement of soil seismic subsidence. Brief Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 It is a schematic structural diagram of the on-site test instrument for soil seismic subsidence of the present invention;

[0031] Figure 2 It is a schematic structural diagram of the second openable plugboard of the present invention;

[0032] Figure 3 It is a flowchart of the usage method of the on-site test instrument for soil seismic subsidence of the present invention;

[0033] Figure 4 It is a flowchart of the operation of the control system of the on-site test instrument for soil seismic subsidence of the present invention;

[0034] Among them, 1. Seat body one; 101. Ellipsoidal outer shell; 2. Seat body two; 3. Airbag; 401. Openable and closable plug board two; 501. Axial pressure controller; 502. Actuator; 503. Displacement gauge; 601. Control panel. Specific implementation manner

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0037] Refer to Figures 1-4 , the present invention provides a field test instrument for soil seismic subsidence, including:

[0038] An openable and closable base, an airbag 3 is installed on the openable and closable base, an openable and closable top seat is installed on the airbag 3, and the airbag 3 has a through hole one;

[0039] A test instrument, the test instrument is installed in the openable and closable top seat, and the test instrument includes an axial pressure controller 501, an actuator 502, and a displacement gauge 503;

[0040] A control system, the control system is arranged on the openable and closable top seat, the control system has a control panel 601, and the axial pressure controller 501, the actuator 502, and the displacement gauge 503 are all electrically connected to the control system 6.

[0041] In this device, the openable top seat is located at the top of the airbag 3, and the openable base is located at the bottom of the airbag 3. During use, the openable base is connected to the lower part of the side of the airbag 3, and the openable top seat is connected to the upper part of the side of the airbag 3. The airbag 3 is in the shape of a circular cylinder, and its inner diameter should ensure that it fits with the upper openable top seat and the lower openable base. During the test, the confining pressure of the soil to be measured can be controlled through it. The whole device is installed in the soil at the measured depth. The axial pressure controller 501 is used to apply axial pressure to the soil, the actuator 502 applies vibration to the soil, and the displacement gauge 503 measures the residual strain generated.

[0042] In a further optimized solution, the openable top seat includes a seat body one 1 and an ellipsoidal outer shell 101. The seat body one 1 and the ellipsoidal outer shell 101 are detachably connected. An openable and closable plug board one is installed on the seat body one 1. The axial pressure controller 501, the actuator 502, and the displacement gauge 503 are installed on the seat body one 1, and the length of the airbag 3 is 20 cm.

[0043] An openable top seat, the upper part of which is an ellipsoidal outer shell 101, and the lower part of the ellipsoidal outer shell 101 is an openable insertion plate one, which serves as a partition between the openable top seat and the side airbag 3. After the openable base and the airbag 3 are installed in the soil at the measured depth, the openable top seat can be connected to the airbag 3.

[0044] In a further optimized solution, the openable base includes a seat body two 2, the seat body two 2 is provided with a through hole two, and an openable insertion plate two 401 is installed on the seat body two 2.

[0045] The seat body two 2 is circular in shape and fits with the upper side airbag 3, separating the internal space surrounded by the side airbag 3 from the external space of the device. During the test, when it is pressed to the appropriate depth, the openable insertion plate two 401 can be popped out and closed to enclose the soil to be measured inside the airbag 3.

[0046] A method for using a field test instrument for soil seismic subsidence includes the following steps:

[0047] Step 1: Open the openable insertion plate two 4 in the openable base so that the inside of the airbag 3 communicates with the seat body two 2;

[0048] Step 2: Place the airbag 3 and the openable base into the soil to be measured. During insertion, the soil to be measured will enter the through hole two of the openable base and also enter the through hole one of the airbag 3, and the instrument will be pressed down to the measured depth;

[0049] Step 3: Install the openable top seat on the airbag 3 and open the openable insertion plate one in the openable top seat so that the openable top seat communicates with the internal space of the airbag 3,

[0050] Make the test instrument, including the axial pressure controller 501, the actuator 502 and the displacement gauge 503, fit with the soil to be measured;

[0051] Step 4: Through the control panel 601, close the openable insertion plate two 401 located in the openable base so that the soil inside the field test instrument for soil seismic subsidence is separated from the external soil, and the test only occurs in the internal soil to be tested;

[0052] Step 5: Through the control system 6, input the preset information and complete the test steps through its program.

[0053] In a further optimized solution,

[0054] The control system 6 inputs the preset data through the control panel 601;

[0055] After the control system 6 receives the preset data input control signal from the control panel 601, it controls the openable insertion plate one and the openable insertion plate two to pop out and close to enclose the internal test soil;

[0056] After receiving the preset data input control signal from the control panel 601, the control system 6 controls the airbag 3 to set the confining pressure applied to the soil according to the set confining pressure;

[0057] After receiving the preset data input control signal from the control panel 601, the control system 6 controls the axial pressure controller 501 to apply the axial pressure to the soil according to the set axial pressure;

[0058] After receiving the preset data input control signal from the control panel 601, the control system 6 controls the actuator 502 to apply the vibration to the soil according to the input vibration time history;

[0059] After receiving the control signal from the control panel 601, the control system 6 controls the displacement gauge 503 to measure the residual strain generated;

[0060] After receiving the measured output data signal from the displacement gauge 503, the control system 6 transmits the data signal to the control panel 601;

[0061] The control system 6, the control panel 601 will perform arithmetic processing on the measured output signal and the input information, and display it for people to read.

[0062] The present invention is an experimental instrument for on-site measurement of the collapsibility of collapsible soil by combining the existing measurement and calculation methods of collapsibility, and uses the method of generating and measuring the residual strain of the soil on-site to measure the collapsibility amount and then calculate the collapsibility coefficient. The existing measurement and calculation methods of collapsibility require complex indoor tests or simulation calculations to determine the empirical formula coefficients and then calculate the total collapsibility amount. The present invention can avoid the complex indoor test process, measure the collapsibility amount of the site in a on-site and direct measurement method, simplify the measurement process of the collapsibility coefficient, and facilitate the operation of the measurement personnel.

[0063] The working principle of the present invention:

[0064] First, set the instrument to the depth of the soil to be measured at the site to be measured, so as to test the seismic subsidence of the soil at the required depth. After that, closing the retractable insert plate 4 on the retractable base can enclose the soil inside the instrument, so that the consolidation and seismic subsidence processes of the soil inside the instrument only occur inside the instrument and do not interact with the external soil. Secondly, the airbag 3 can change the confining pressure exerted on the soil by inflating and deflating, so as to set the lateral consolidation pressure exerted on the soil. During the testing process of the enclosed soil sample with the testing instrument, first set the axial consolidation pressure through the axial pressure controller 501. After the consolidation deformation is stable, then apply the dynamic load time history through the actuator 502 to cause the soil to subside. Finally, use the displacement gauge 503 to measure the residual strain generated by the soil to complete the measurement procedure. The control system 6 integrates control, data input and output functions. First, input the preset data through the control panel 601. The preset control program completes the measurement steps. Then, the control system 6 completes the collection, processing and calculation of the measurement data. Finally, it is output through the control panel 601, making the testing process of the instrument simple and easy for the testers to operate.

[0065] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0066] The above-described embodiments are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A field test instrument for soil seismic subsidence, characterized in that, Comprising: An openable base, on which an airbag (3) is installed, and an openable top seat is installed on the airbag (3), and the airbag (3) has a first through hole; A testing instrument, which is installed in the openable top seat, and the testing instrument includes an axial compression controller (501), an actuator (502) and a displacement meter (503); A control system (6), which is arranged on the openable top seat, the control system (6) has a control panel (601), and the axial compression controller (501), the actuator (502) and the displacement meter (503) are all electrically connected to the control system (6).

2. The on-site testing instrument for soil seismic subsidence according to claim 1, characterized in that: The openable top seat includes a first seat body (1) and an ellipsoidal outer shell (101), the first seat body (1) and the ellipsoidal outer shell (101) are detachably connected, a first openable plug board is installed on the first seat body (1), the axial compression controller (501), the actuator (502) and the displacement meter (503) are installed on the first seat body (1), and the length of the airbag (3) is 20 cm.

3. The on-site testing instrument for soil seismic subsidence according to claim 2, characterized in that: The openable base includes a second seat body (2), the second seat body (2) has a second through hole, and a second openable plug board (401) is installed on the second seat body (2).

4. A method for using an on-site testing instrument for soil seismic subsidence, based on the on-site testing instrument for soil seismic subsidence described in claim 3, characterized in that, Including the following steps: Step 1: Open the second openable plug board (401) in the openable base so that the inside of the airbag (3) communicates with the second seat body (2); Step 2: Insert the airbag (3) and the openable base into the soil to be tested. When inserting, the soil to be tested will enter the second through hole of the openable base, and at the same time, it will also enter the first through hole of the airbag (3), and press the instrument down to the depth to be tested; Step 3: Install the openable top seat on the airbag (3), and open the first openable plug board in the openable top seat so that the inside of the openable top seat is connected to the internal space of the airbag (3), so that the testing instrument, including the axial compression controller (501), the actuator (502) and the displacement meter (503), is in contact with the soil to be tested; Step 4: Through the control panel (601), close the second openable plug board (401) located in the openable base so that the soil mass inside the airbag (3) is separated from the external soil mass, so that the test only occurs in the soil mass to be tested inside the airbag (3); Step 5: Through the control system (6), input preset information and complete the test steps through its program.

5. The method for using a field testing instrument for soil seismic subsidence according to claim 4, characterized in that: The control system (6) inputs preset data through the control panel (601); After receiving a preset data input control signal from the control panel (601), the control system (6) controls the first openable plug board and the second openable plug board (401) to pop out and close to enclose the internal soil mass to be tested; After receiving a preset data input control signal from the control panel (601), the control system (6) controls the airbag (3) to set the confining pressure of the soil mass according to the set confining pressure; The control system (6), after receiving a preset data input control signal from the control panel (601), controls the axial pressure controller (501) to apply axial pressure to the soil mass according to the set axial pressure; The control system (6), after receiving a preset data input control signal from the control panel (601), controls the actuator (502) to apply vibration to the soil mass according to the input vibration time history; The control system (6), after receiving a control signal from the control panel (601), controls the displacement meter (503) to measure the residual strain generated; The control system (6), after receiving the measured output data signal from the displacement meter (503), transmits the data signal to the control panel (601); The control system (6), the control panel (601) performs arithmetic processing on the measured output signal and the input information, and displays it for people to read.

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