Multidimensional-loading and unloading multiphase porous media strong-coupling damage and porous flow experimental system and method

Abstract

The invention discloses a multidimensional-loading and unloading multiphase porous media strong-coupling damage and porous flow experimental system and a method. The system comprises an axial loading and unloading subsystem, a lateral loading and unloading subsystem, a confining pressure loading and unloading subsystem, a crack damage breaking monitoring subsystem, a central sealed cavity, an inflation subsystem and the like, and the experimental requirements of gas-solid-liquid porosity media mechanical deformation damage characteristic experiment, adsorption swelling deformation breaking porous flow experiment, loaded and unloaded gas-solid-liquid coupling porous flow experiment and gas / water pressure cracking experiment and the like can be met at the same time; the determination on porous flow spatial and temporary variability of the spatial and temporary variability media in X, Y and Z three-dimension direction can be realized, and the synchronous real-time monitoring to the crack expansion and damage during experiment can be performed.

Description

technical field [0001] The invention belongs to the technical field of coal and rock damage seepage testing, and in particular relates to a multi-dimensional loading and unloading multi-phase porous medium strong coupling damage seepage test system and method. Background technique [0002] Defects such as joints and fissures in fractured coal and rock mass seriously affect the strength characteristics and permeability characteristics of coal and rock mass. The study of seepage characteristics of coal and rock mass occupies an important position in various geological engineering applications, such as water conservancy and hydropower engineering, mining and petroleum engineering, and nuclear waste storage engineering. The Malpasset arch dam in France (1959) collapsed during its initial impoundment, and the Vayon slope instability in Italy (1963) and other accidents caused people to attach great importance to the seepage problem of fractured rock mass. [0003] The seepage fie...

AI Technical Summary

Problems solved by technology

The seepage characteristics under one-dimensional loading cannot meet the real stress environment of underground mining; the three-dimensional loading pressure chamber has complex structure, single function, complicated operation, and it is difficult to fully guarantee the air tightness of the system; none of the existing rock seepage test systems can meet the requirements for crack damage. The study of evolution cannot realize the coupling of stress, seepage, and damage; as the mining of coal resources enters the deep stage, the problems of high stress and low permeability become more and more serious. In order to increase the permeability of coal seams, hydraulic measures are taken to increase permeability and increase Fractures and porosity require not only gas-solid coupled seepage, but also solid-liquid coupled seepage. The existing rock seepage test system cannot meet this multi-functional requirement.

Images