A Simple Triaxial Compression Test Apparatus for Rock

Abstract

The invention discloses a simple triaxial compression test instrument for rock. The instrument comprises a triaxial pressure chamber, a triaxial pressure loading device and a loading control and data acquiring system and is characterized in that the triaxial pressure chamber comprises a pressure chamber support, a hydraulic cylinder, upper and lower ejector rods, a piston part and a rubber jacket, wherein the upper ejector rod is connected with an axial displacement sensor through a fixing plate; the triaxial pressure loading device comprises a cabinet operation panel, a pressure sensor, a radial displacement sensor, a piston pump applying axial pressure and a plunger pump applying confining pressure, and electro-hydraulic servo control is adopted in a test; the loading control and data acquiring system can acquire, store and process test data in real time and display multiple test curves, and computer control can partially replace the button function of the operation panel of the loading device. The instrument is small, exquisite and flexible, rock samples are simple to load and unload, the test time is greatly shortened, and the instrument is low in cost and can be applied to a lot of basic test research; an acoustic emission probe is adsorbed on the lower ejector rod, and an acoustic emission test under the triaxial compression condition of the rock can be conducted simultaneously.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics, and in particular relates to a simple rock triaxial compression test instrument. Background technique [0002] The physical and mechanical properties of rock are one of the research focuses in the fields of oil and gas field engineering, tunnel engineering, water conservancy and hydropower engineering, and mining engineering. The triaxial test of rock is an important means to study the physical and mechanical properties of rock. , peak strength, cohesion and internal friction angle and other basic mechanical parameters, and can also use the full stress-strain curve for energy analysis and compressibility analysis. [0003] In the development process of the three-axis testing machine in the past 200 years, there have been two major advances, one is the birth of the rigidity testing machine, and the other is the realization of feedback servo control. From 1935, when Speath performed pressur...

AI Technical Summary

Problems solved by technology

Strain gauge measurement technology requires long test preparation time, high operational technical requirements, and is greatly affected by high temperature and high pressure factors; displacement sensor measurement technology has high precision, but also has high requirements for equipment structure and installation, especially the measurement of radial displacement It is more difficult; the digital image measurement technology realizes the non-contact direct measurement of the deformation process, but limited by the material properties of the side wall of the triaxial pressure chamber, this technology is only suitable for rocks with weak strength such as argillaceous rock

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