Microcomputer-controlled electro-hydraulic servo rock triaxial dynamic shear-seepage coupling test method

Abstract

A microcomputer-controlled electro-hydraulic servo rock tri-axial dynamic shear-seepage coupling multifunctional test method belongs to the technical fields of rock mechanics and engineering technology and is characterized in that a test apparatus is composed of a loading system, a sealing system, a multiphase fluid injection system, an acoustic emission monitoring system, a deformation monitoringsystem and a data collection system. The test method not only solves technical problems that a tri-axial pressure chamber cannot be used for performing large displacement shear-seepage coupling of rocks under high confining pressure and high seepage pressure, and also can achieve various extended functions on the basis of the technology. The apparatus can achieve servo control loading of force, displacement and strain rate in shear direction and injection seepage of a multiphase fluid during dynamic shear. In addition, the apparatus is equipped with a temperature control system for performingconstant temperature control to the tri-axial pressure chamber at 0-200 DEG C; therefore, a series of extended experiments of dynamic shear-seepage coupling features of rocks under effect of temperature can be carried out.

Description

technical field [0001] The microcomputer-controlled electro-hydraulic servo rock triaxial dynamic shear-seepage coupling test method of the present invention belongs to the field of rock mechanics and engineering technology, and is mainly used for dynamic shear-seepage coupling of complete or single-crack rocks under different temperature effects and different fluid injections Experimental study of characteristics. Background technique [0002] In underground geotechnical engineering, the interaction between rock mass and groundwater often determines the stability of rock mass engineering, and the shear-slip instability of rock mass under hydraulic coupling usually leads to major geological disasters. Therefore, In-depth study of the shear-seepage coupling characteristics of rock mass and the resulting instability rules is of vital importance to solve the stability of underground rock mass engineering. [0003] At present, there are not many studies on the shear-seepage cou...

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Problems solved by technology

However, these existing joint shear test equipment have the following problems: 1. The sealing operation of the test equipment is cumbersome and the sealing effect is difficult to meet the requirements of the test; 2. Most of these test techniques are based on the transformation of the rock direct shear test machine However, it is difficult to ensure the constant shearing direction of the upper and lower boxes of the direct shear box during the shear slip process, which makes it difficult to achieve lateral sealing, especially difficult to achieve High seepage pressure sealing; 3. The traditional direct shear box only considers the normal force of the rock mass, but ignores the lateral force pressure, which makes the stress state of the rock mass and the actual state of occurrence serious. Inconsistent; 4. The traditional direct shear box has not seen gas as the permeation medium, which makes the test function single

5. The shear displacement of the rock is not very large, mainly because the larger the shear displacement, the worse the sealing performance of the cracked rock; 6. There is no reliable monitoring equipment to monitor the rock shear seepage process, and only rely on It is neither scientific nor accurate to infer the shear-seepage characteristics based on the variation of deformation and flow

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