Experimental device for researching shear slip mechanical properties of frozen soil between freezing pipe roofs

Abstract

The invention discloses an experimental device for researching shear slip mechanical properties of frozen soil between freezing pipe roofs. The experimental device comprises a counter-force frame assembly, a sliding assembly, a drive loading unit, a shear working unit, a measurement and acquisition system, a control system and a low-temperature circulating cold bath system, wherein the sliding assembly and the drive loading unit are installed on the counter-force frame assembly, the shearing working unit is installed on the sliding assembly, and the measurement and acquisition system is in communication connection with the control system; and the measurement and acquisition system collects sliding mechanical properties of the frozen soil in the shearing working unit and transmits collecteddata to the control system. According to the experimental device , a bidirectional loading unit is arranged, through dynamic feedback of the bidirectional load sensor and the displacement sensor, frozen soil shearing loading of deformation control or force control is achieved, and the development evolution of shearing slippage under the inter-pipe frozen soil plane strain state can be accuratelyreproduced.

Description

technical field [0001] The invention relates to the technical field of shear test equipment for frozen soil between frozen pipe curtain pipes. Specifically, it is an experimental device used for the study of the mechanical characteristics of shear slip of frozen soil between frozen pipe curtains. Background technique [0002] In the traditional freezing technology, the function of the freezing wall is to seal water and bear the load, while in the pipe curtain freezing technology, the main body of the load is the pipe curtain (large-diameter steel pipes arranged at small intervals). The main function of the freezing wall is to seal the water, and its bearing function is weakened and Transfer, the purpose of pipe curtain freezing is to reduce the volume of frozen soil and reduce the adverse impact of soil freezing and thawing on the environment. Frozen soil has strong rheological properties. The frozen wall in the pipe curtain freezing project is relatively thin. After excava...

AI Technical Summary

Problems solved by technology

Frozen soil has strong rheological properties. The frozen wall in the pipe curtain freezing project is relatively thin. After excavation, the frozen soil between the pipes is significantly affected by the ambient temperature. Under the action of the formation load, the frozen soil between the pipes will appear along the pipe wall. A certain degree of slip deformation, the slip surface is a space surface, and the slip path is complex

The shear plane of the traditional permafrost direct shear instrument is a plane, which cannot meet the research needs of such problems

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