Triaxial experiment instrument pressure chamber for measuring rock specimen volume strain and operation method thereof

Abstract

The invention discloses a triaxial experiment instrument pressure chamber for measuring rock specimen volume strain and an operation method thereof. The triaxial experiment instrument pressure chambercomprises a base and a pressure cabin arranged on the base, wherein the pressure cabin is a confining pressure sealed accommodating cavity; a precise volume pressure controller and a pressure sensorconnected in the pressure cabin jointly act; the pressure in the cabin is enabled to be strictly invariant by regulating the water inlet and outlet quantity, so that the water outlet quantity is the volume strain of a rock specimen; finally, the conversion is performed with vertical strain to obtain Poisson's ratio. The condition that errors caused by subjective influence of operators during the position selection in a traditional strain gage pasting method is avoided; the phenomenon of liquid leakage caused by strain gauge conducting wires is also avoided; meanwhile, all parameters can be obtained through once experiment; the data non-unified errors caused by many time of experiments are avoided; the experiment operation process is greatly simplified; the experiment efficiency is improved; the confining pressure is provided through water injection from water inlet holes. Compared with traditional method using oil pressure, the method has the advantages that the water sources are wide;high economic performance is realized; the control is easy.

Description

technical field [0001] The invention belongs to the field of geotechnical experiments in the discipline of geotechnical engineering, and in particular relates to a pressure chamber of a triaxial experimental instrument for measuring the volumetric strain of a rock sample and an operating method thereof. Background technique [0002] In the field of civil engineering, the constitutive relationship of soil is very important and very complex, which reveals the stress-strain deformation characteristics of soil. The volumetric strain of the rock triaxial experiment is an important parameter of the constitutive relationship, which is mainly calculated by combining Poisson's ratio with axial strain. There are two main methods of obtaining Poisson’s ratio: (1) Firstly, the uniaxial experiment of the rock is carried out, and the lateral strain of the rock block is measured by sticking a resistive strain gauge on the side of the rock sample without confining pressure. ε 2 and the ve...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a triaxial experimental instrument pressure chamber and its operating method for measuring the volumetric strain of rock samples, which solves the inaccurate and strain caused by the use of uniaxial experimental parameters in the prior art for triaxial experiments. The error caused by the selection of the position of the slice, the existing experimental process is not easy to operate

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