Unsaturated soil variable structure suction testing device

A technology of structural suction and testing equipment, which is applied in the direction of applying stable tension/pressure to test the strength of materials, and can solve the problem that the magnitude of variable structural suction is not directly measured

Inactive Publication Date: 2015-06-17
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the complexity of variable structural suction, there are currently only indirect test methods. For example, Tang Liansheng (2003) used the shear strength of undisturbed soil and remolded soil at different saturations to indirectly test the shear strength corresponding to variable structural suction. , but the magnitude of the variable structure suction has not been directly measured

Method used

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  • Unsaturated soil variable structure suction testing device
  • Unsaturated soil variable structure suction testing device
  • Unsaturated soil variable structure suction testing device

Examples

Experimental program
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Embodiment Construction

[0012] (1) Apply vaseline to the inside of the mold, and then fix the mold with three jacket clamps.

[0013] (2) Insert the mold into the target soil. After it is full, twist the bolts of the jacket fixture to loosen the fixture, and then carefully remove the jacket fixture and the mold outside the glass.

[0014] (3) Put a section of short plastic tube with a diameter slightly larger than the soil sample at both ends of the soil sample, then hold the plastic tube with your hands, and stick the soil sample and the short plastic tube to the force transmission plate with glue.

[0015] (4) After the glue is fixed, put it on the test device, open the valve of the thin plastic water pipe, and slowly pour tap water into the plastic water container.

[0016] (5) When the sample is just broken, stop water injection, and weigh the total weight G of the broken upper part of the soil, the upper force transmission plate and the tap water in the plastic water container.

[0017] (6) The...

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Abstract

The invention relates to an unsaturated soil variable structure suction testing device, in particular to an unsaturated soil variable structure suction direct testing device, and belongs to an innovative technology in the field of unsaturated soil variable structure suction testing devices. The unsaturated soil variable structure suction testing device comprises two parts, namely a sample preparation device and a testing device, wherein the sample preparation device is composed of two semi-cylindrical molds, the degree of tightness of the molds is controlled through three outer clamps outside, and a micro soil sample can be manufactured. After the soil sample is manufactured, short plastic pipes with slightly larger diameters sleeve two ends of the soil sample, are adhered to a force transferring plate together with the soil sample, and then are placed in the testing device as shown in accompanying diagrams. Load application is carried out by slowly adding water, the total weight of the upper half part of a broken soil body, the force transferring plate on the top and water in a water container is tested after the soil sample is broken. According to the unsaturated soil variable structure suction testing device disclosed by the invention, the variable structure suction under different degrees of saturation can be directly tested, and the difficulty that the variable structure suction is tested by an indirect testing manner only at present is avoided.

Description

Technical field: [0001] The invention relates to a variable structure suction test device for unsaturated soil, in particular to a direct test device for variable structure suction of unsaturated soil, which belongs to the innovative technology in the field of variable structure suction test device for unsaturated soil. Background technique: [0002] Structural suction is the sum of internal tensile stresses related to structural properties in unsaturated soil, including cementation force, electrostatic force, magnetic force, occlusal force, etc. Depending on whether it is affected by changes in water content, structural suction can be divided into intrinsic structural suction and variable structural suction. Among them, the intrinsic structural suction is the true cohesion between soil particles, which does not change with the change of water content, corresponds to a certain original structural state of the soil, and is the structural suction that can still be maintained b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/14
Inventor 汤连生桑海涛孙银磊罗珍贵陈浩昆张龙舰
Owner SUN YAT SEN UNIV
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