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System and method for testing shear strength of expansive soil under dry-wet cycle action

A shear strength, dry-wet cycle technology, applied in the direction of using a stable shear force to test material strength, strength characteristics, measuring devices, etc., can solve the problems of missing important indicators and inability to measure the shear strength of expansive soils. To achieve the effect of convenient operation process, solving the inability to measure shear strength, and simple principle and method

Active Publication Date: 2021-06-11
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method and equipment cannot measure the shear strength of expansive soil during the dry-wet cycle process, so an important index reflecting the shear strength of expansive soil during the dry-wet cycle process is missing

Method used

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  • System and method for testing shear strength of expansive soil under dry-wet cycle action
  • System and method for testing shear strength of expansive soil under dry-wet cycle action
  • System and method for testing shear strength of expansive soil under dry-wet cycle action

Examples

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Embodiment 1

[0033] This embodiment provides a system for testing the shear strength of expansive soil under the action of dry-wet cycles, such as figure 1 with figure 2 As shown, it includes a pressure plate instrument for measuring the soil-water characteristic curve and a detachable shear strength measuring device, wherein the pressure plate instrument can realize the dry-wet cycle of the flat cylinder test with the matrix suction within 1500kPa, which includes the pressure solid The pressure regulating device, the water volume measuring device, and the data acquisition module are respectively connected to the pressure consolidation device; after the soil sample completes the dry-wet cycle, dismantle the pressure solid The loading part and cover plate in the junction device are replaced with the shear strength measuring device.

[0034] Further, the pressure consolidation device includes a support frame 1, a sample chamber 2, a booster cylinder 3, a first loading shaft 5, and a second...

Embodiment 2

[0050] This embodiment provides a method for testing the shear strength of expansive soil under the action of dry-wet cycles, using the system described in Example 1, including the dry-wet cycle process and the process of testing the shear strength, specifically:

[0051] Wet and dry cycle process:

[0052] Prepare saturated samples by using "Soil Engineering Test Method Standard GBT50123-1999", and start pre-consolidation through the pressure consolidation device; after pre-consolidation, readjust the water level in the measuring cylinder, gas collecting bottle and horizontal measuring tube to the marked scale , record the reading of the burette.

[0053] Turn the pressure regulating valve to adjust the air pressure to the required matrix suction value. The added air pressure value is directly displayed on the air pressure digital display. It is necessary to keep the vertical stress in the pre-consolidation process unchanged. Record and adjust the readings and parameters of t...

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Abstract

The invention discloses a system and method for testing the shear strength of expansive soil under dry-wet cycle action. According to the technical scheme, the system comprises a pressure consolidation device, a pressure regulating device and a water volume measuring device, and the pressure regulating device and the water volume measuring device are respectively connected with the pressure consolidation device; wherein the pressure consolidation device comprises a sample chamber, a cover plate mounted at the top of the sample chamber and a loading part arranged in the sample chamber, after a dry-wet cycle is completed in the sample chamber, the loading part and the cover plate are replaced by a shear strength measuring device, and a shear strength test is performed through the shear strength measuring device. According to the invention, the pressure consolidation device can be replaced by the shear strength measuring device, so that the constant suction shear strength of a soil sample under the dry-wet cycle action is measured, the shear strength of a soil body under the dry-wet cycle action is accurately measured, and important strength indexes of expansive soil are supplemented.

Description

technical field [0001] The invention relates to the technical field of indoor geotechnical tests, in particular to a system and method for testing the shear strength of expansive soil under the action of dry-wet cycles. Background technique [0002] In expansive soil, the water absorption volume expands significantly, and dehydration produces obvious volume shrinkage. Under the action of repeated dry-wet cycles, the cracks in expansive soil will further increase, the integrity will be destroyed, and then the soil will be severely fragmented and its strength will decrease sharply. Many expansive soil embankment collapses and slope instability in the project are caused by the dry-wet cycle. The study of the change of the shear strength of the expansive soil under the action of the dry-wet cycle is related to the damage of the expansive soil to the structure and the safety of people's life and property. Therefore, we urgently need a method and device that can measure the shear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/24G01N3/04
CPCG01N3/24G01N3/04G01N2203/0025G01N2203/04
Inventor 李凯宗睿孙可明王朔赵新波孔亮张树翠张兆军
Owner QINGDAO TECHNOLOGICAL UNIVERSITY