CN210862622U - A Model Test Soil Internal Strain Measurement Device - Google Patents

Abstract

The utility model discloses an inside strain measurement device of model test soil body, including model test case, data acquisition instrument, horizontal strainometer and vertical strainometer, fill experimental soil in the model test case, a plurality of horizontal strainometer sets up in the experimental soil that model test case was filled according to experimental demand level, and the vertical strainometer of a plurality of passes through the data line and is connected with the outer data acquisition instrument of model test case according to the vertical setting of experimental demand in the experimental soil that model test case was filled. The device is through setting up horizontal strainometer and vertical strainometer in the proof box, and the strainometer passes through the data line and is connected with the data acquisition instrument, can accurately obtain the displacement of meeting an emergency of each position of the soil body in the proof box, and automatic acquisition data, data accuracy is high, and the acquisition speed is fast.

Description

A Model Test Soil Internal Strain Measurement Device

technical field

The utility model relates to the technical field of soil internal strain measurement, in particular to a model test soil internal strain measurement device.

Background technique

Soil model test is a very important method in the application and research of geotechnical engineering. An important part of the rock and soil model test is the data collection inside the rock and soil mass. However, it is very difficult to collect the internal information of the rock and soil mass, especially the accurate acquisition of the strain and displacement data inside the rock and soil mass, and there has been a lack of simple and accurate means.

The existing methods for measuring the internal strain of soil in the model test are generally only able to measure single point or vertical displacement in the soil, or use the transparent soil + camera graphic recognition technology. Good method. There are also some measuring devices that can only measure the vertical displacement of a certain depth range in the soil, and manual reading is used, so the data collection efficiency is low.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the prior art, and to provide a model test soil internal strain measuring device, which has a simple structure and can measure the horizontal and vertical strain displacement, as well as the strain and strain of different parts of the soil. Displacement; automatic data collection, high data accuracy and fast collection speed.

The technical scheme that realizes the purpose of the present utility model is:

A model test soil internal strain measurement device, including a model test box, a data acquisition instrument, a horizontal strain gauge and a vertical strain gauge, the model test box is filled with test soil, and several horizontal strain gauges are set horizontally in the model test according to the test requirements. In the test soil filled by the box, several vertical strain gauges are vertically installed in the test soil filled in the model test box according to the test requirements. instrument connection.

The several horizontal strain gauges are arranged evenly and horizontally in the test soil filled in the model test box.

The several vertical strain gauges are vertically arranged in the test soil filled in the model test box at uniform intervals.

The model test box is a square box, the length is greater than 30cm, the width is greater than 30cm, and the height is greater than 20cm.

The model test soil is fine-grained soil to ensure that there is no gap between the soil and the strain gauge, including clay or sandy soil.

The strain gauge adopts an embedded high-precision strain gauge, which can produce cooperative deformation with the soil.

The said acquisition instrument adopts a multi-channel acquisition instrument to be matched with a strain gauge, and can simultaneously read the information output by a plurality of strain gauges and automatically record and store it.

The data cable adopts the data cable with good waterproofness and screen defect, and the shielding coverage rate of the outer layer of tin foil is 100%.

The utility model provides a device for measuring the internal strain of a model test soil. The device is provided with a horizontal strain gauge and a vertical strain gauge in a test box, and the strain gauge is connected with a data acquisition instrument through a data line, so that the inside of the test box can be accurately obtained. The strain displacement of each position of the soil body can automatically collect data, with high data accuracy and fast collection speed.

Description of drawings

1 is a schematic structural diagram of a device for measuring internal strain in a model test soil according to an embodiment;

In the picture: 1. Model test box 2. Test soil in the model 3. Horizontal strain gauge 4. Vertical strain gauge 5. Data line 6. Data acquisition instrument.

Detailed ways

The content of the present utility model will be further described below in conjunction with the accompanying drawings and embodiments, but it is not intended to limit the present utility model.

Example:

As shown in Figure 1, a model test soil internal strain measurement device includes a model test box 1, a data acquisition instrument 6, 6 horizontal strain gauges 3 and 3 vertical strain gauges 4. The model test box is a square box. The length is greater than 30cm, the width is greater than 30cm, and the height is greater than 20cm. The model test box 1 is filled with test soil 2, and the model test soil adopts fine-grained soil such as clay or sand to ensure that there is no gap between the soil and the strain gauge. In the test soil 2 filled by the test box, three vertical strain gauges 4 are vertically arranged in the test soil 2 filled with the model test box at uniform intervals according to the test requirements. The horizontal strain gauge 3 and the vertical strain gauge 4 are embedded. High-precision strain gages can produce cooperative deformation with the soil; each horizontal strain gage 3 and vertical strain gage 4 pass through the data line 5 with good waterproof and shielding properties, and the outer tin foil shielding coverage rate 5 It is connected to the data acquisition instrument 6 outside the model test box 1, and a multi-channel acquisition instrument is used to match the strain gauge, which can read the output information of multiple strain gauges at the same time and automatically record and store it.

The method of using the device is:

1) Lay a layer of test soil at the bottom of the model test box. After the soil is leveled and compacted, 6 horizontal strain gauges are evenly spaced on the test soil. The distance between the strain gauge and the bottom or side wall of the model test box should be greater than 5cm; Then, the test soil is laid on the horizontal strain gauge and compacted to ensure that there is no gap between the strain gauge and the soil; at the same time, each horizontal strain gauge uses a separate data cable to lead out the outside of the model test box and connect to the data acquisition instrument;

2) Before the model test box is filled with soil, place a vertical circular tube at the position of the pre-embedded vertical strain gauge, and put the strain gauge in the circular tube. The inner diameter of the circular tube is 2-5mm larger than the outer diameter of the strain gauge; After the soil reaches a certain height, the circular tube is slowly lifted out in sections, the strain gauges in the exposed circular tube are in direct contact with the soil, and then the filling is compacted; the subsequent filling follows this method until all the vertical strain gauges are buried in the soil. The strain gauge is led out by a data cable and connected with the data acquisition instrument;

3) After the soil in the model test box is completely filled, external loads, light or rainfall are applied to the surface of the soil. These external factors cause certain strain and displacement inside the soil, and the strain gauge and the surrounding soil deform synchronously , and transmit the strain and displacement information to the external acquisition instrument for display or storage.

Claims (8)

1. A model test soil internal strain measuring device is characterized in that, comprising a model test box, a data acquisition instrument, a horizontal strain gauge and a vertical strain gauge, the test soil is filled in the model test box, and several horizontal strain gauges are tested according to the test soil. The required level is set in the test soil filled in the model test box, and several vertical strain gauges are vertically set in the test soil filled in the model test box according to the test requirements. Data acquisition instrument connection outside the test box. 2 . The device for measuring the internal strain of a model test soil body according to claim 1 , wherein the several horizontal strain gauges are arranged horizontally and evenly in the test soil filled in the model test box. 3 . 3 . The device for measuring the internal strain of a model test soil body according to claim 1 , wherein the several vertical strain gauges are vertically arranged in the test soil filled in the model test box at uniform intervals. 4 . 4 . The device for measuring the internal strain of soil for a model test according to claim 1 , wherein the model test box is a square box with a length greater than 30cm, a width greater than 30cm, and a height greater than 20cm. 5 . 5 . The device for measuring the internal strain of a model test soil body according to claim 1 , wherein the model test soil is fine-grained soil to ensure that there is no gap between the soil body and the strain gauge. 6 . 6 . The device for measuring the internal strain of soil in a model test according to claim 1 , wherein the strain gauge adopts an embedded high-precision strain gauge. 7 . 7 . The device for measuring the internal strain of soil in a model test according to claim 1 , wherein the acquisition instrument adopts a multi-channel acquisition instrument to be matched with a strain gauge, and simultaneously reads the information output by a plurality of strain gauges. 8 . And automatically record storage. 8. The device for measuring the internal strain of soil in a model test according to claim 1, characterized in that, the data line is made of a device with waterproof and shielding properties, and an outer tin foil shielding coverage rate of 100%. data line.

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