Pressure stabilizing and pressure difference controlling system for rock joint whole-shear seepage coupling test

Abstract

The invention relates to a pressure stabilizing and pressure difference controlling system for a rock joint whole-shear seepage coupling test. The system comprises a water tank, an incoming water pressure adjusting unit for adjusting incoming water pressure, a to-be-tested joint sample shear seepage box, an outgoing water pressure adjusting unit for adjusting water pressure at an outlet of the joint sample shear seepage box and a flow meter and further comprises a control unit, wherein both the incoming water pressure adjusting unit and the outgoing water pressure adjusting unit are connectedwith the control unit. During testing, the incoming water pressure adjusting unit and the outgoing water pressure adjusting unit are controlled through the control unit, so that incoming water pressure, outgoing water pressure and pressure difference of a joint sample shear seepage box can be regulated accurately. Compared with the prior art, the system has the advantages that a high-pressure plunger pump is adopted at a water inlet, so that high permeation pressure can be provided for the rock joint shear seepage test; a water inlet pressure stabilizing system is utilized to solve the problemof unstable inlet pressure caused by pulse wave of inlet pressure of the high-pressure plunger pump, and equipment running efficiency is improved greatly.

Description

technical field [0001] The invention relates to rock mass engineering test equipment, in particular to a pressure stabilization and differential pressure control system for full shear seepage coupling test of rock joints. Background technique [0002] The coupling characteristics of seepage and stress in deep rock mass joints has become a key scientific problem that needs to be solved urgently in the stability analysis of large deep underground engineering. The full shear seepage coupling test of rock joints is the most effective and direct method to study the hydraulic characteristics of rock joints. "Regulation and measurement of high permeable water pressure" as a key technical difficulty in the development of the basic test platform "Rock Joint Full Shear-Seepage Coupling Test System" needs to be resolved urgently. Since the pore width of the rock joints will change continuously during the shearing process, this will bring problems to the seepage pressure control during...

AI Technical Summary

Problems solved by technology

Since the pore width of the rock joints will change continuously during the shearing process, this brings problems in the control of the seepage pressure during the shearing process of the rock joints, especially under the high seepage pressure. The author cannot provide a stable water pressure.

In previous studies, the seepage water pressure of the rock joint shear seepage test system relies on the head difference between the upper and lower reaches of the water tank to provide stable water flow, and seepage tests can only be performed under low seepage water pressure conditions.

Then the seepage system uses high-pressure nitrogen to apply water pressure, which can only reach 1.5MPa

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