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A soil direct shear test device and method for simulating immersion-air-drying cycle

A test device and cyclic action technology, which is applied in the direction of using a stable shear force to test the strength of materials, soil material testing, measuring devices, etc., can solve the problems of low test accuracy, cumbersome process, long time consumption, etc., to speed up the test process. , the effect of avoiding cumbersome and control errors

Active Publication Date: 2019-02-22
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process cannot truly simulate the soaking and air-drying cycle process of the soil in the water-fluctuating zone of the bank slope. During the test process, manual operations are required for each link. The process is cumbersome, time-consuming, and the test accuracy is low.

Method used

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  • A soil direct shear test device and method for simulating immersion-air-drying cycle
  • A soil direct shear test device and method for simulating immersion-air-drying cycle
  • A soil direct shear test device and method for simulating immersion-air-drying cycle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] see Figure 1-9 , a soil direct shear test device simulating soaking-air-drying cycle, it comprises test bench 26, air-water exchanger 21 and support 24, and air-water exchanger 21 communicates with the water storage tank 8 of test bench 26, and support 24 is installed on the bottom of the test bench 26, the test bench 26 is provided with a shearing device, the shearing device includes a normal displacement sensor 5, and the normal displacement sensor 5 is fixed on the pressure transmission rod of the vertical loading device 27 Above, the sealing cover 15 of the porous pressure transmission plate 6 is sealed and connected to the water storage tank 8 through the sealing rubber ring 17 and the fixing bolt 14, and the water inlet channel 16 is set at the bottom of the water storage tank 8, and the water inlet channel 16 will drain the water in the water storage tank 8 The water is transported to the soil sample 28 through the permeable stone 7, and then the soil sample 28 ...

Embodiment 2

[0050] Adopt above-mentioned test device to carry out immersion-air-dry cycle test method, it is characterized in that, it comprises the following steps,

[0051] Step 1: The experimenter first aligns the upper shear box 4 and the lower shear box 3, inserts the bolts to fix them, then puts the permeable stone 7 and filter paper into the lower shear box 3 in sequence, and then places the prepared soil sample 28 Put it into the shear box, and finally place filter paper and permeable stone 7 on the soil sample, cover the porous pressure transmission plate 6, and install the normal displacement sensor 5;

[0052] Step 2: First, place a sealing rubber ring 17 between the water storage tank 8 and the sealing cover 15 on the periphery of the porous pressure transmission plate 6, and then connect the two with fixing bolts 14 to ensure that the water storage tank 8 and the periphery of the porous pressure transmission plate 6 are The inner space formed by the sealing cover 15 has good ...

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Abstract

The invention provides an apparatus and method capable of simulating action of a soaking-air drying cycle and used for direct shear test of soil. The apparatus comprises a testing stand, an air-water exchanger and a support, wherein the air-water exchanger is connected with a water storage tank through a pipeline, the water storage tank is communicated with a water storage groove pm the testing stand via a water inlet pipe, and the testing stand is installed on the support. In a shearing device on the testing stand, the two interior side surfaces, located at a non-shear displacement direction, of the water storage groove are provided with heating plates; the heating temperature and time of a temperature sensing and controlling instrument are set to control the process of heating and drying of a soil sample by the heating plates; and the air-water exchanger communicated with the water storage tank realizes monitoring and measurement of water pressure in the water tank by converting air pressure into hydraulic pressure. The apparatus can directly carry out drying-wetting cycle operation and related direct shear test on a soil sample in a shearing box, avoids tedious manual operation, improves testing efficiency and reduces errors brought by manual operation.

Description

technical field [0001] The invention relates to a soil test device, in particular to a soil direct shear test device and method for simulating soaking-air-drying cycles. Background technique [0002] In recent years, some progress has been made in the research on the influence of dry-wet cycle on the soil strength of expansive soil in specific areas, but there are still few studies on the dry-wet cycle of the soil in the hydrofluctuation zone of the relevant reservoir slope. After the completion of the typical Three Gorges Project, the reservoir water level in the Three Gorges Reservoir area has been greatly increased and cyclically changed between 145 and 175m, and the hydrogeological environment of the reservoir area has also undergone tremendous changes, which will inevitably affect the stability of the bank slope. After impoundment in the Three Gorges Reservoir area, the rock and soil mass in the drawdown zone of the bank slope of the reservoir is in an alternating state...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24G01N33/24
CPCG01N3/24G01N33/24G01N2203/0025
Inventor 邓华锋肖瑶方景成李建林张恒宾王晨玺杰王哲张小景胡玉
Owner CHINA THREE GORGES UNIV
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