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| Creep characteristics and creep model of siltstone under triaxial#br#
compression and graded unloading |
| ZHOU Ruihe1，CHENG Hua1，2，CAI Haibing1，WANG Xiaojian1，GUO Longhui1 |
(1. School of Civil Engineering and Architecture，Anhui University of Science and Technology，Huainan，Anhui 232001，China；
2. School of Resources and Environmental Engineering，Anhui University，Hefei，Anhui 230022，China) |
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Abstract Aiming at the creep characteristics of surrounding rock during excavation of deep mine roadways and taking the siltstone in the ingate roadway of the west ventilation shaft in Yuandian No. 2 coal mine as the research object，triaxial compression and graded unloading creep test was carried out by setting the loading mode according to the actual adjustment path of stress in the process of roadway surrounding rock excavation，and the creep characteristics of siltstone under different confining pressures were systematically analyzed. An unloading creep model of siltstone was established by introducing viscoplastic creep starting element based on fractional derivative and verified by the experiment results. The results show that when the stress level is lower than the quasi-failure stress of siltstone，siltstone only presents two creep stages such as attenuation and steady states. When the stress level is higher than the quasi-failure stress of siltstone，siltstone enters the stage of nonlinear accelerated creep until failure occurs. Under different initial confining pressures，the total time of creep failure and the start-up time of nonlinear accelerated creep failure of siltstone are obviously different. The axial creep deformation of siltstone samples is positively correlated with the initial confining pressure. The proposed creep model has the advantages of relatively few parameters and easy introduction in numerical analysis software. The research has certain application value for analyzing the stability of surrounding rock after unloading in siltstone roadway construction in the future.
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2022, Vol. 41 
