Orthogonal stress state controllable direct shear test device and test method

Abstract

The invention belongs to the technical field of civil engineering, water conservancy and hydropower engineering and new energy engineering, and particularly relates to an orthogonal stress state controllable direct shear test device and test method. The device is formed by organically combining a circular sliding mechanism, a horizontal loading device, a fixing device, a vertical loading assembly,a confining pressure control device and a permeable mechanism, wherein the sliding mechanism is provided with an upper shearing box and a lower shearing box and is connected to the lower part of thelower shearing box. According to the actual stress state of the rock-soil body, the normal pressure and the lateral confining pressure bidirectional stress of the test sample are regulated and controlled, so that the test sample is subjected to drainage consolidation in an original occurrence stress state. The problem that confining pressure regulation cannot be considered in a traditional directshear test device and method is solved, and the real stress state of the sample is restored as much as possible. According to the method, the lateral confining pressure of the sample can be dynamically regulated and controlled, the shear strength parameter of the rock-soil body can be obtained more truly, and more detailed and accurate basis is provided for engineering safety and stability analysis.

Description

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AI Technical Summary

Benefits of technology

This patented technology helps prevent problems when testing rocks or earth samples with high stresses by controlling their normal pressures while also allowing them to recover from damage caused by other forces such as sidewall tension. It allows researchers to study how these damaged materials behave differently compared to non-damaging ones. Additionally, this technology enables dynamic changes on both sides of the material being tested based upon its own unique properties like elasticity and compressibility. Overall, this new technique improves understanding of important factors affecting mechanical behavior (stress), design security measures, and environmental impacts.

Problems solved by technology

This patents describes how strong rocks can break down under very heavy loads due to their own weight. To measure this resistance accurately requires accurate measurements over time without sacrificially affecting any other factors that might have affected it. Current methods for measuring these forces require destructive testing techniques such as drilling holes into them beforehand. These conventional tests also result in wasted material resources caused by excessively excavating materials around areas where they were being tested.

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