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| AN EQUATION FOR DAMAGE DEVELOPMENT AND VOLUMETRIC DILATION OF CRACKED ROCK |
| LI Jie1，2，WANG Mingyang1，2，ZHANG Ning1，MA Linjian1 |
| (1. State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact，PLA University of Science and Technology，Nanjing，Jiangsu 210007，China；2. School of Mechanical Engineering，Nanjing University of Science and Technology，Nanjing，Jiangsu 210094，China) |
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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.
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Received: 11 November 2013
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2015, Vol. 34 
