Test method for researching shear slip mechanical properties of frozen soil between freezing pipe curtain pipes

Abstract

The invention discloses a test method for researching shear slip mechanical properties of frozen soil between freezing pipe curtain pipes. The method comprises the following steps of before a test isstarted, assembling a counter-force frame assembly, a sliding assembly and a driving loading unit in a low-temperature environment test room; hoisting a shearing work unit and fixing to the sliding assembly through a hoisting tool, filling a shearing soil box defined by the shearing work unit with test soil, pushing the ready-to-fill shearing work unit into a shearing work area of a main frame, installing a shearing-resistant beam, and installing and connecting measurement sensing equipment; adjusting and enabling a power output end of a driving loading unit to abut against the corresponding position of the shearing work unit; starting a low-temperature environment testing machine air cooler and a low-temperature circulating cold bath to a set temperature at the beginning of the test, keeping the constant temperature for 36-48 hours, and starting a control system and a driving loading unit; and using the control system to make the driving loading unit apply vertical and transverse loads to the shearing soil box, and transmitting the vertical and transverse loads to the control system through a measuring and collecting system. Through dynamic feedback of a two-way load sensor and adisplacement sensor, frozen soil shearing loading of deformation control or force control is achieved, and development evolution of shearing slippage under an inter-pipe frozen soil plane strain statecan be accurately reproduced.

Description

technical field [0001] The invention relates to the technical field of a method for measuring shear slippage of frozen soil between frozen pipe curtain pipes. Specifically, it is a test method for studying the mechanical properties 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 excavation, t...

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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