脆性岩石热–水–力耦合断裂的断口分析

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Abstract Coupled thermo-hydro-mechanical(THM) fracturing tests and scanning electron microscope(SEM) tests were performed to study the macroscopic and microscopic characteristics of coupled THM fracturing of brittle rocks. Finite element method and a new fracture criterion on the ratios of stress intensity factor were applied to predict the fracturing mode under THM coupled condition. The red sandstone specimens are found to have three types of modes of fracturing macroscopically with the corresponding fracturing features microscopically under different THM coupling conditions. Transverse fracturing occurs macroscopically and transgranular shear fractures occur microscopically for the specimens under low temperature，low hydraulic pressure and high confining pressure. Longitudinal fracturing occurs macroscopically and intergranular tensile fractures occur microscopically for the specimens under high temperature，high hydraulic pressure and low confining pressure. Cross directional(transverse and longitudinal) fracturing occurs macroscopically and mixed fractures(transgranular and intergranular) occur in the specimens under medium temperature，medium hydraulic pressure and medium confining pressure. The predicted modes of fracturing under THM coupling with the finite element method and the new fracture criterion of ratios of stress intensity factor are found to be in good agreements with that obtained with the fractographic analysis.

Key words： rock mechanics thermo-hydro-mechanical(THM) coupled fracturing test fracturing modes fractographic analysis fracturing mechanism brittle rock

Received: 23 November 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I6/1179

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