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Evaporation and dehumidification direct shear instrument for unsaturated soil and its application method

A direct shear instrument and dehumidification technology, which is applied in the field of unsaturated soil evaporative dehumidification direct shear instrument, can solve the problem that it is difficult to truly reflect the suction state of natural unsaturated soil, it is difficult to ensure the natural state of evaporative dehumidification, unsaturated soil Problems such as the determination of shear strength parameters, etc., to achieve the effect of short test period, simple structure and easy to grasp

Active Publication Date: 2021-05-14
YUNNAN AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 2. The airtightness of the pressure chamber of the axial translation technology is difficult to guarantee:
[0007] At present, the commonly used direct shear instrument for unsaturated soil seals the shearing system of the entire direct shear instrument with a sealed pressure chamber in order to add air pressure to the soil sample, which not only makes the structure of the direct shear instrument complicated, but also increases the pressure chamber. The problem of air tightness, it is difficult to truly reflect the suction state of natural unsaturated soil
[0008] 3. It is difficult to ensure that the sample is in the natural state of evaporation and dehumidification during the shearing process:
[0010] 4. Long test period and high cost:
However, using a double pressure chamber unsaturated soil triaxial tester to measure the shear strength of unsaturated soil requires a lot of cost to purchase special instruments, and the test period is very long. For actual engineering projects with tight time or limited economic resources, It is very difficult to determine the shear strength parameters of unsaturated soil

Method used

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  • Evaporation and dehumidification direct shear instrument for unsaturated soil and its application method
  • Evaporation and dehumidification direct shear instrument for unsaturated soil and its application method
  • Evaporation and dehumidification direct shear instrument for unsaturated soil and its application method

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Effect test

Embodiment 1

[0066] refer to Figure 1-16 , the present invention provides the use method of unsaturated soil evaporative dehumidification direct shear instrument, it is characterized in that, the operating steps of described unsaturated soil evaporative dehumidification direct shear instrument are:

[0067] Step 1: Put the heating resistor 21 and the heat-conducting metal plate 22 into the lower shear box 7 in turn, the upper shear box 6 and the lower shear box 7 are stacked and aligned and then connected by pins 26, one side of the lower shear box 7 is connected to the The propeller 11 of the horizontal loading device 3 is connected, and one side of the upper shear box 6 is connected to the end of the measuring ring 12 to provide horizontal loading for the shear box 1;

[0068] Step 2: Prepare the sample 24 to be tested with a ring cutter having the same size as the cavity interface of the shear box 1;

[0069] Step 3: Place the sample 24 to be tested in the ring knife on the inner cavi...

Embodiment 2

[0076] refer to Figure 1-16 , the present invention provides the use method of unsaturated soil evaporative dehumidification direct shear instrument, it is characterized in that, the operating steps of described unsaturated soil evaporative dehumidification direct shear instrument are:

[0077] Step 1: Put the heating resistor 21 and the heat-conducting metal plate 22 into the lower shear box 7 in turn, the upper shear box 6 and the lower shear box 7 are stacked and aligned and then connected by pins 26, one side of the lower shear box 7 is connected to the The propeller 11 of the horizontal loading device 3 is connected, and one side of the upper shear box 6 is connected to the end of the measuring ring 12 to provide horizontal loading for the shear box 1;

[0078] Step 2: Use a ring cutter with the same size as the cavity interface of the shear box 1 to prepare the sample 24 to be tested, and drill a hole for the sample to be tested in the center of the sample 24 to be test...

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Abstract

The invention provides an unsaturated soil evaporative dehumidification direct shear instrument and a use method thereof, comprising: a base, a shear box arranged on the base, a horizontal loading device, a vertical loading device, a matrix suction measuring device, and a device for promoting evaporation and dehumidification; The sample to be tested is placed in the shear box; the matrix suction measuring device is arranged in the sample to be tested; the vertical loading device is arranged above the shear box to provide vertical loading for the shear box; the horizontal loading device and The shear box is connected to provide horizontal loading for the shear box, and the device for promoting evaporation and dehumidification is placed in the shear box. The invention solves the problem that the existing unsaturated soil direct shear instrument cannot simulate the dehumidification state of the natural soil body, and can accurately measure the soil body strength parameters in the dehumidification process of the unsaturated soil body.

Description

technical field [0001] The invention belongs to the technical field of civil engineering instrument testing, and relates to an unsaturated soil evaporation dehumidification direct shear instrument and a use method. Background technique [0002] A series of projects involved in unsaturated soil mechanics, such as the construction and operation of earth dams, natural soil slopes under environmental changes, slope stability for excavated earth, ground uplift caused by expansive soils, and many practical problems in collapsible soils Problems can only be solved by understanding the seepage, volume change and shear strength characteristics of soil. For both saturated and dry soils, the shear strength is proportional to the effective stress in the saturated soil. When the soil is in an unsaturated state, water, air and soil particles coexist in three phases, and its shear strength law will be completely different from that in saturated or dry conditions. Therefore, the study of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0025
Inventor 杨松周明凯黄剑峰
Owner YUNNAN AGRICULTURAL UNIVERSITY