Device and method for testing fluid migration law in creep of soft rock samples containing ice

Abstract

The invention discloses a device and a method for testing the law of fluid migration in the creep of soft rock samples containing ice. The device includes: multi-connected sample tank, XYZ true triaxial pressure system, temperature control system, CT scanner, various parameter sensors and data collector; a plate pressurization device is set in the sample tank, and the plate pressurization device Used to apply local pressure or global pressure to the sample in any direction of XYZ, the plate pressurization device includes a pressurization controller and a pressurization plate, and the pressurization plate includes an upper end pressure plate, a buffer plug and a lower end connected in sequence Pressure plate. The device and method provided by the present invention can not only simulate the graded loading creep, unloading creep, dynamic load creep, cooling-pressure ice-thawing creep test of moraine-containing layer, frozen soil or hydrate layer more realistically, but also can Carry out mechanical parameter analysis test. Moreover, it can detect and analyze the deformation and failure characteristics of rock mechanical structures through various test parameters such as permeability, CT detection, acoustic emission, and conductivity analysis.

Description

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

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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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