Device and method for testing fluid migration rule in creep deformation of ice-containing soft rock sample

Abstract

The invention discloses a device and a method for testing a fluid migration rule in creep deformation of an ice-containing soft rock sample. The device comprises a multi-connected sample tank, an XYZ true triaxial pressure system, a temperature control system, a CT scanner, a plurality of parameter sensors and a data collector. A plate pressurizing device is arranged in the sample tank, the plate pressurizing device is used for applying local pressure or global pressure to a sample in any one of the X direction, the Y direction and the Z direction, the plate pressurizing device comprises a pressurizing controller and a pressurizing plate, and the pressurizing plate comprises an upper-end pressurizing plate, a buffer plug and a lower-end pressurizing plate which are connected in sequence. The device and the method provided by the invention not only can really simulate graded loading creep, unloading creep, dynamic load creep and cooling-ice pressing melting creep tests of a moraine-containing layer, frozen soil or hydrate layer, but also can carry out a mechanical parameter analysis test. And rock mechanical structure deformation and damage characteristics can be detected and analyzed through a plurality of test parameters such as permeability, CT detection, acoustic emission, conductivity analysis and the like.

Description

technical field [0001] The invention relates to the technical fields of tunnel engineering technology and mine safety mining, in particular to a device and method for testing the law of fluid migration in the creep of ice-soft rock samples. Background technique [0002] During the construction of alpine mountainous areas in western my country and submarine underground projects, loose permafrost, moraine layers and hydrate weak strata are often traversed. Due to the strong low-temperature creep characteristics of ice-bearing soft rock, it is prone to large deformation, water gushing, sand gushing, and gas release, which brings a series of difficulties to the site construction, seriously restricting safe construction and efficient mining of mineral resources. Studies have shown that in complex geological environments such as excavation disturbances, unloading, temperature changes, and multiphase seepage, the creep process of soft ice-bearing rocks will be accompanied by phase ...

AI Technical Summary

Problems solved by technology

Among them, the consolidation instrument is generally used for soil research, and cannot change the size of the confining pressure; the uniaxial instrument is used for soil or rock research, and can only achieve axial loading, and cannot apply confining pressure and pore pressure; the triaxial instrument can be used for soil body or rock research, but the sample size used by the existing triaxial instrument is small, and the boundary effect is obvious; in addition, it is difficult to simulate the real occurrence state of ice-bearing soft rock with pseudo-triaxial loading, and there is a lack of microscopic observation means

Moreover, the existing rock-soil creep test equipment generally has low efficiency. The experiment for each sample takes a few days at least, and it takes a month at most. It often takes several months to complete the test of several samples, which cannot meet the needs of the project.

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