Large-scale multifunctional frozen soil-structure contact surface cyclic direct shearing instrument and its test operation method

Abstract

The invention is a large multifunctional frozen soil-structure interface cyclic direct shear apparatus and a test operation method. The structure of the apparatus comprises a horizontal and vertical loading system, a horizontal and vertical displacement and a load sensor, a temperature control and refrigeration system, a temperature sensor, a data collecting and self-stabilizing system, a guide rail system, and a soil sample box and supports. The test operation method comprises the steps of: 1. Installing the interface steel of required roughness; 2. Applying normal boundary conditions to a soil sample; 3. Cooling the soil sample; and 4. When the temperature cools to a target temperature, performing a shearing to the frozen soil interface in a selected shearing speed, at the same time the date collecting system beginning to record the stress-strain relation of the frozen soil interface. The apparatus and the method are the advantageous in that: 1) accurate control of the interface temperature in the temperature range between 0 DEG C and -20 DGE C can be achieved; 2) three normal boundary conditions of constant stiffness, constant displacement and constant stress can be accurately applied; 3) interfaces of various roughness can be simulated; 4) two shear modes of cyclic shear and monotonic shear can be realized; and 5) the stress applying and displacement control are accurate.

Description

technical field [0001] The invention is a large-scale multifunctional frozen soil-structure contact surface circular direct shear instrument used in the study of the mechanical behavior of the frozen soil-structure contact surface and its test operation method, which belongs to the low-temperature contact surface shear in the indoor model test of geotechnical engineering. cutter equipment. Background technique [0002] The current shearing equipment is mostly developed and used for various mechanical properties of normal temperature soil, but there is no report on the large-scale multifunctional low-temperature cycle direct shear instrument for studying the mechanical behavior of the interface between frozen soil and structures. Contents of the invention [0003] The present invention proposes a frozen soil-structure direct shear instrument and its test operation method, the purpose of which is to further study the mechanical properties and influencing factors of the froze...

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Problems solved by technology

[0002] Most of the current shearing equipment is developed and used for various mechanical properties of soil at normal temperature, but there is no report on the large-scale multi-functional low-temperature cycle direct shear instrument for studying the mechanical behavior of the interface between frozen soil and structures

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