TEST SYSTEM FOR MEASURING GAS PERMEATION PARAMETERS OF ULTRA-LOW PERMEABILITY MEDIUM IN MULTI-FIELD AND MULTI-PHASE COUPLING CONDITIONS

摘要

A test system for measuring the gas permeation parameters of an ultra-low permeability medium in multi-field and multi-phase coupling conditions, comprising a triaxial permeation chamber (1), a deformation monitoring apparatus (2), a temperature sensing control apparatus (3), a volume/pressure controller (4), a bias stress loading apparatus (5), a gas injection apparatus (6), an outlet buffer container (7), and an ultra-low permeation flow monitoring apparatus (8); the test process comprises: first applying temperature and triaxial stress control to a rock-soil mass sample; using the gas injection apparatus (6) to inject high-pressure gas into the rock-soil mass sample; after permeation, the high-pressure gas enters the outlet buffer container and the ultra-low permeation flow monitoring apparatus (8) to acquire the gas permeation flow; and, in the test process, the deformation monitoring apparatus (2) can measure the local absolute deformation of the rock-soil mass sample. Full-process monitoring of the gas permeation of an ultra-low permeability medium in multi-field and multi-phase coupling conditions is thereby implemented, enabling the acquisition of gas permeation features and macroscopic deformation features.