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| A damage constitutive model and strength criterion of rock mass considering the dip angle of joints |
| WANG Jie1，2，SONG Weidong1，2，FU Jianxin1，2 |
| (1. School of Civil and Resources Engineering，University of Science and Technology Beijing，Beijing 100083，China；2. State Key Laboratory of High-efficient Mining and Safety of Metal Mines，Ministry of Education，University of Science and Technology Beijing，Beijing 100083，China) |
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Abstract For the single continuous jointed rock mass with different dip angles，the concepts of initial joint damage，load damage and total damage were proposed. Based on the damage mechanics，a damage evolution model and a damage constitutive model were established considering the coupling of structural effect and loading. The method of total differential was employed to establish the strength criterion of jointed rock mass considering the effect of the dip angle of joints. The models were verified and analyzed. The theoretical curves of the models constructed in this paper agree with the experimental result，which verifies the correctness of the models. The initial joint damage shows an inverted U-type distribution that increases first and then decreases with the increase of the dip angle of joints. The ratio of the maximum to minimum values of the initial joint damage reaches 2.13，indicating that the dip angle of joints has a great influence on the initial damage of the jointed rock mass. The total damage curve shows an S-type distribution that rises slowly first，then rises rapidly and finally rises slowly to 1 with the increase of the dip angle of joints. The total damage rate curve shows a normal distribution that increases first and then decreases with the increase of the strain and a U-type distribution that decreases first and then increases with the increase of the dip angle of joints. The total damage and total damage rate decrease with the increase of confining pressure，indicating that the confining pressure has an inhibitory effect on the damage evolution.
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2018, Vol. 37 
