Large-scale multifunctional frozen soil-composition contact surface cycle direct shear apparatus and test operation method

A multi-functional, contact surface technology, applied in the direction of applying stable shear force to test the strength of materials, etc., to achieve the effect of precise stress application and displacement control

Active Publication Date: 2012-11-28
NANJING FORESTRY UNIV
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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

Method used

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  • Large-scale multifunctional frozen soil-composition contact surface cycle direct shear apparatus and test operation method
  • Large-scale multifunctional frozen soil-composition contact surface cycle direct shear apparatus and test operation method

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Experimental program
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Embodiment

[0023] 1) Overall dimensions of the instrument: Bracket dimensions: length 2000×height 700×width 800mm, instrument dimensions: length 1500×height 900×width 500mm.

[0024] 2) Horizontal reciprocating shearing is completed by servo motor 3, worm gear reducer 4, tension pressure sensor 7, dowel 6, horizontal displacement sensor 23 and elevator 8. The power of the horizontal reciprocating shearing source is realized by a servo motor (power 1.1kW). In order to ensure the shearing speed set in the test, a reducer (reduction ratio of 1:15) is installed between the servo motor and the connecting rod of the soil box. A tension and pressure sensor is set between the connecting rod and the reducer to realize real-time monitoring of the horizontal shear load, and the elevator (with a driving speed ratio of 1:24) is installed at the bottom of the servo motor to realize the precise position of the servo motor in the vertical direction For control, the horizontal displacement sensor is inst...

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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...

Claims

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Application Information

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IPC IPC(8): G01N3/24
Inventor 杨平赵联桢王海波何文龙张婷
Owner NANJING FORESTRY UNIV
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