裂隙岩体动态损伤演化与体积扩容方程

doi:10.13722/j.cnki.jrme.2013.1708

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Abstract Time-dependent dilation of rocks is directly related to the tensile expansion of numerous inner micro-cracks. Based on the fracture mechanics，the process of initiation and propagation of micro-fractures driven by localized tensile stresses in the region near the stress concentration was discussed in the paper. Further，the dispersion damage mechanics was used to describe the behavior of the crack system. Thus the connection between the micro-fracture and the macro dilation was established. Experimental analysis proved that the equation proposed in the paper described perfectly the dilation process of rocks during loading-unloading. This dilation equation together with the deformation equation existed formed a complete constitutive model.

Key words： rock mechanics crack rock mass damage evolution dilation constitutive model

Received: 11 November 2013

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2013.1708 OR http://www.rockmech.org/EN/Y2015/V34/I08/1532

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