Indoor test system and test method for seepage characteristics of jointed rock mass

Abstract

The invention discloses an indoor test system and a test method for seepage characteristics of jointed rock mass. Through carrying out seepage, deformation and stress coupling tests of seepage performance for a large scale jointed rock mass test piece under high pressure water to a given jointed rock mass, the test pressure, flow and displacement can be simultaneously displayed and collected in real time, and the test data can be stored. The test method comprises the following steps: a test rock piece with a fissure surface is placed into a mould, the mould is placed into water, and the fissure surface inclination of the rock is adjusted; a water filling pipe is installed on the fissure surface of the rock, the water filling pipe is connected with a high pressure pump, and pressure cells are installed on an upper plate and a lower plate of the fissure surface of the rock; anchorage points are arranged on the upper side and the lower side of the fissure surface, and the anchorage points are connected with a displacement meter; high flow and high pressure hydraulic test is carried out by the high pressure pump to the fissure surface through the water filling pipe, the collected data is transferred to a collector by a pressure sensor on the water filling pipe, a flow sensor, the press cells and the displacement meter respectively and then accesses to a computer, and the real-time pressure, flow, relative displacement of the fissure and coupling relationship are continuously recorded and displayed.

Description

technical field [0001] The invention belongs to the technical field of rock mechanics tests, and relates to the hydraulic characteristics of cracked rock mass and the mechanism research of multi-field coupling under the condition of deep high stress. and displacement test methods, indoor test system and method for seepage characteristics of fractured rock mass. Background technique [0002] The main parameters of rock hydraulics are the hydraulic characteristics of a single fracture and the equivalent hydraulic characteristics of rock mass, and the two are closely related. The permeability characteristics of cracks and rock blocks between cracks are the basic parameters that constitute the rock mass permeability tensor. The fracture permeability or hydraulic conductivity depends on the geometric characteristics of the fracture surface, such as undulation, roughness, gap width, etc. The latter can only be measured accurately in the laboratory, and its influence on the hydrau...

AI Technical Summary

Problems solved by technology

[0003] In the existing rock hydraulics research, the seepage parameters are all tested from small-scale rock mass specimens. Due to the limitation of the sample size and the disturbance in the sample preparation process, the performance of the fracture cannot be fully reflected, and the coupling test is also measured in the normal direction. Seepage-stress tests under stress conditions are mostly, but for fractured rock mass, there is a lack of seepage-stress coupling test of fractured rock mass under high stress

On the other hand, the on-site Lu Rong test or the three-stage pressure water test proposed by C.Louis mainly uses geological drilling to test the permeability of rock mass under lower pressure, and generally lacks a detailed description of the fracture network of rock mass

The three-dimensional water pressure test can consider the anisotropy of the seepage tensor of rock mass fractures, but there is still a lack of water pressure tests to study the coupling of seepage-deformation-stress

Images