Large interface shearing equipment and implementation method thereof

Abstract

The invention discloses large-scale interface shearing equipment and an implementation method thereof. The interface shearing equipment is formed by assembling a normal pressure loading system, a horizontal servo push-pull system, a platform device, an upper shearing box and a lower shearing box. In the testing process, a material with higher strength is put into the lower shear box, a material with lower strength is put into the upper shear box, then the air compressor is started, a valve of the air pressure cylinder is adjusted to control a normal pressure value, and after the normal pressure value is stable, the horizontal servo thrust system is further started to apply a horizontal thrust to the upper shear box so that interface shearing is realized. In the whole shearing process, whole-process data acquisition of horizontal servo thrust, horizontal displacement and normal pressure is achieved through an equipment control system, and an interface shearing characteristic curve between different materials is obtained. The equipment is large in shearing contact area, has a normal pressure stabilizing function and a vertical pressure data real-time acquisition function, can more accurately obtain interface shearing characteristics of different materials, and has important popularization and application values.

Description

Technical field [0001] The present invention relates to a geothermal test apparatus, and more particularly to a large interface shear apparatus and its implementation. Background technique [0002] Straight shear equipment has been widely used in geotechnical tests in geotechnical engineering to determine the shear strength of all kinds of geotechnical materials and determine interface shear characteristics between the materials, simple operation and data accuracy, is for each Main Test Method for Determination of Class Granium Soil Site Strength Index. However, since the currently manufactured small straight shear equipment is too small to eliminate the effect of soil boundary force conditions, and the application of the large straight shear equipment method is applied to the pressure of jacks that cannot be accurately depleted, and in the shear When the test starts, the pressure is seriously resolved, which is difficult to determine the accuracy of the normal stress, resulting ...

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Problems solved by technology

However, due to the small size of the currently manufactured small direct shear equipment, the influence of the force condition of the soil boundary cannot be eliminated, and the application of the normal pressure of the large direct shear equipment using a jack cannot accurately obtain the change of the compressive stress and the shear The serious drop of normal pressure at the beginning of the test cannot be solved, which makes it difficult to accurately measure the normal stress, which leads to the overly conservative design of the application object, resulting in a waste of a lot of human and material resources

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