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| Modified D-P criterion based on the double-fold reduction method of the true triaxial single-side unloading strength |
| XU Wensong1，2，3，ZHAO Guangming1，2，MENG Xiangrui1，2，CHENG Xiang1，2 |
| (1. The MOE Key Laboratory of Coal mine Safety and High Efficiency Mining，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. School of Energy and Safety Engineering，Anhui University of Science and Technology，Huainan，Anhui 232001，China；3. School of Architecture And Civil Engineering，West Anhui University，Liuan，Anhui 237012，China) |
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Abstract To evaluate the safety of rock around the excavation front of roadway in mine or mountain ridge， tests on griotte under different loadings and unloadings of principal stress were conducted using true triaxial system. The variation of cohesion c，internal friction angle ，and Lode parameter of griotte were discussed in detail according to the Mohr-Coulomb and Drucker-Prager criterions. The maximum attenuation path was obtained and the double attenuation coefficient of the cohesion c and internal friction angle was calculated. The results indicate that the condition for calculating the fracture strength based on M-C and D-P criterion is that the principal stress is loaded symmetrically. Under the condition of single sided unloading in the direction of minimum principal stress，the fracture strength calculated with the criterion is higher. The fracture strength value calculated with the double attenuation coefficient method based on M-C criterion is lower. The calculated fracture strength value using the D-P criterion that is modified by the strength reduction method based on the M-C criterion is closer to the actual situation.
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2018, Vol. 37 
