Large contact surface characteristic direct shear apparatus with cycle loading function

Abstract

The invention relates to a large contact surface characteristic direct shear apparatus with cycle loading function, in particular to a novel large direct shear apparatus for researching the interface frictional characteristics between soils, between geo-synthetic and soil or between geo-synthetics, wherein the apparatus is applied for the equal shear surface test or variable shear surface test between optional two materials, and the direct shear apparatus is particularly applied for performing the interface characteristic test research under the functions of vertical cycle loading and horizontal cycle loading.

Description

technical field [0001] The invention relates to a new type of large-scale direct shear instrument for studying the interface friction characteristics between soil bodies and between geosynthetic materials and soil bodies or between geosynthetic materials. Shear surface test; in particular, the interface characteristic test research under the action of vertical and horizontal cyclic loads can be carried out, which is the key innovation of the present invention. Background technique [0002] In civil engineering, especially geotechnical engineering, reinforced soil structures such as reinforced soil subgrades, reinforced soil retaining wall structures, reinforced slope structures, etc. are usually encountered. Another example is that in a water conservancy dam project, the contact surface between the concrete dam and the soil has a large initial internal shear stress and displacement discontinuity due to the difference between the two materials, so the contact surface is the s...

AI Technical Summary

Problems solved by technology

[0005] Although the above-mentioned direct shear instrument has some improvements compared with the traditional instrument, it still cannot meet the requirements of more realistic simulation of the friction characteristics of the reinforcement-soil interface in engineering practice.

There are some problems: the size of the upper and lower shear boxes is fixed (the same size or different) and relevant comparative tests cannot be carried out; the measurement accuracy of the hydraulic control system cannot meet the scientific research requirements; The research on the friction characteristics of synthetic materials is limited, which reduces the scope of application of the shear instrument; the vertical cyclic load cannot be applied to simulate the shear friction characteristics of the soil under the action of traffic loads; other factors include the low level of automation of the equipment

Images