边坡潜在滑移面关键单元岩体裂隙演化特征细观试验与滑移机理研究

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Abstract Tests on red sandstone under shear creep condition were done with both self-developed shear creep microscopic testing device and monitoring software of coal or rock micromechanics properties. Micro-cracks temporal and spatial evolution law of red sandstone under shear creep condition and the relationship between morphological properties of rupture surface and shear creep strength were analyzed. Slope slip mechanism is discussed in this paper，too. The results show that creep deformation and micro-cracks propagation were developed simultaneously under shear creep condition；the propagation direction of micro-cracks has bias in some degree compared with shear stress，and multiple bifurcations occur in the process of crack propagation；most cracks are along grain boundary，and the irregularity of crack propagation path is affected by the distribution of rock grains；micro-cracks are mostly formed by tension and shear together and the differences of stress response and inconsistent deformation between different components of rock and the interaction of micro-cracks promote the initiation and propagation of micro-cracks. Relation curve between roughness of rupture surface and shear creep strength is non-linear increasing，and the curvature increases at first then decreases.

Key words： potential slip surface key unit shear creep micro-cracks temporal and spatial evolution

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http://www.rockmech.org/EN/Y2015/V34/I05/935

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