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Suction force controllable unsaturated soil static triaxial apparatus based on internal body variable precision measurement

A soil static triaxial instrument and controllable technology, which is applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of low test accuracy and unreasonable test principle, and achieve high test accuracy and shorten the test time. Maintenance cycle, technically feasible effect

Active Publication Date: 2015-07-01
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Under the condition of not using the traditional clay plate, the accurate measurement of the volume change of unsaturated soil is realized, especially the method of internal volume change is used for volume variable measurement and suction control, which solves the problem of unsaturated triaxial soil in the past. The problem of unreasonable instrument test principle and low test accuracy

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  • Suction force controllable unsaturated soil static triaxial apparatus based on internal body variable precision measurement
  • Suction force controllable unsaturated soil static triaxial apparatus based on internal body variable precision measurement
  • Suction force controllable unsaturated soil static triaxial apparatus based on internal body variable precision measurement

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Embodiment Construction

[0027] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] Figure 1 to Figure 4 A schematic diagram of the overall structure of the present invention and a sectional view of each important component are given. The suction controllable unsaturated soil static triaxial instrument based on the precision measurement of the inner body variable mainly consists of the following parts: the host part, the water circulation and thrust water source part, and the data acquisition and processing part.

[0029] Refer to attached figure 1 And attached figure 2, the host part mainly consists of: the reaction force support 2 stands on the outer edge of the base 1, the axial adjustment piston 3 stands on the middle of the base 1; the confining pressure chamber with the axial loading rod 9 placed on the top is placed on the axial adjustment piston 3, The confining pressure chamber is composed of the con...

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Abstract

The invention discloses a suction force controllable unsaturated soil static triaxial apparatus based on internal body variable precision measurement. The static triaxial apparatus comprises a main machine part, a water circulating and pressure-stabilizing thrusting water source part and a data acquisition and processing part, wherein the water circulating and pressure-stabilizing thrusting water source part is mainly composed of two independent waterway parts formed by two thrusting pressure-stabilizing water sources, and the two independent waterway parts comprise a confining pressure control waterway for providing stable pressure for a confining pressure chamber and a monitoring waterway for precision measurement of internal body variables and suction force. The static triaxial apparatus still adopts the axis-translation technology without adopting a ceramic plate used by the traditional unsaturated instrument necessarily, and can realize precision measurement of the unsaturated soil body variables and control of the suction force in a testing process, therefore, a process that the ceramic plate is saturated is removed, the lagging problem of water drainage of the ceramic plate is solved, and the suction force in the unsaturated soil can be accurately controlled; according to the suction controllable unsaturated soil static triaxial apparatus, automatic control and measurement can be realized in the whole process, the requirements for reasonable experiment principle, high measurement precision and technical feasibility can be met, and the testing efficiency can be greatly improved.

Description

technical field [0001] The invention relates to an indoor geotechnical experiment testing device, in particular to a static triaxial instrument for studying unsaturated soil, and belongs to the category of geotechnical engineering testing and unsaturated soil mechanics experiment equipment. Background technique [0002] The soil of "civil engineering" is divided into saturated soil and unsaturated soil, and 90% of land soil belongs to the category of unsaturated soil. The higher it is, the indoor geotechnical experiment conditions are required to be consistent with the actual engineering conditions, and the indoor experimental research on the mechanical properties of unsaturated soil is the general trend. Before the 1990s, equipment development technology could not realize unsaturated mechanical testing, but since the 21st century, the international development and promotion of unsaturated soil mechanical properties experimental equipment has begun. [0003] Today, the expe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/12
Inventor 崔凯张继勋黄邦文郭国庆
Owner SOUTHWEST JIAOTONG UNIV
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