Lateral confining pressure adjustable rock lateral restraint expansion rate determination device

Abstract

Provided is a lateral confining pressure adjustable rock lateral restraint expansion rate determination device. The device comprises a hydraulic cylinder, a piston is arranged in the hydraulic cylinder, and the hydraulic cylinder is connected with an oil tank, a pressure gauge and a lateral restraint pressure instrument through an oil inlet pipe and an oil outlet pipe respectively; up-and-down movement of the piston is controlled through a lever, oil in the oil tank is delivered into a closed chamber through a pipeline, contraction deformation of a rubber ring in the closed chamber is controlled, and lateral confining pressure is adjusted through a throttle valve; the lateral restraint pressure instrument is connected with a top plate through a supporting column, a telescopic rod is fixed on the top plate, a longitudinal displacement extensometer is arranged on the telescopic rod, access of a computer comprising a data collection system is achieved through a data line, longitudinal deformation of rock sample water swelling is collected in real time, and the rock expansion rate is obtained. According to the lateral confining pressure adjustable rock lateral restraint expansion rate determination device, the defects that for a traditional rock expansion rate experiment device, the lateral confining pressure cannot be controlled accurately, the deformation measurement precision is poor, and deformation and accurate reading are not synchronized are overcome.

Description

technical field [0001] The invention relates to an experimental device for measuring the hydraulic properties of rocks and a method for using the same, in particular to a device for measuring lateral confinement expansion rate of rock with controllable lateral confining pressure and a method for using the same. Background technique [0002] The expansion rate of rock lateral restraint is the ratio of the expansion deformation of rock samples that are not easy to disintegrate after immersion in water to the original size of the specimen under lateral restraint conditions. The traditional rock lateral confinement expansion rate tester uses a metal collar to directly limit the lateral expansion deformation of the rock sample, and cannot precisely restrain the lateral confining pressure of the rock sample. At the same time, the traditional rock lateral restraint expansion rate tester uses the manual reading method of the dial gauge to measure the expansion deformation, which has...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that the lateral confining pressure of the rock sample cannot be accurately controlled, the measurement accuracy of the expansion deformation is poor, and the expansion deformation and the accurate reading are not synchronized, and to provide a high-precision rock lateral confining pressure that can adjust the lateral confining pressure. Constrained Expansion Rate Measuring Device

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