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The occurrence mechanism and influencing factors of fault-slip rockburst
Kangyu Wang,Guangjian Liu,Zonglong Mu,Zhicheng Wang,Hao Zhou 한국지질과학협의회 2023 Geosciences Journal Vol.27 No.5
No method can simulate the stress wave generated by fault slip in the previous numerical simulation of fault-slip rockburst. As a result, the radiation characteristics cannot be simulated realistically, which causes the unclear mechanism of fault-slip rockburst. Therefore, the mechanical-parameter steepest descent method and static-dynamic analysis method were proposed. Taking the 7301 working faces of Zhaolou Coal Mine as the engineering background, the work analyzed the radiation characteristics of slip stress waves and the evolution characteristics of stress, cracks, and energy in the surrounding rocks of roadway in the process of rockburst. Besides, the influence law of fault geometric properties on rockburst was studied. (1) The mechanical-parameter steepest descent method based on the Mohr-Coulomb criterion could realistically simulate the stress waves generated by fault slip. (2) The fault-slip stress waves had the radiation characteristics of the P and S waves. The vibration velocity around the source was anisotropic, and the velocities of the P and S waves were 1,449 and 833 m/s, respectively. The simulation results were similar to real data. (3) The whole process of rockburst induced by fault slip was simulated. The process of fault-slip rockburst existed at the stable stage, initial rockburst stage, and full-scale rockburst stage. The number of tension cracks during the calm period was used as precursor information for rockburst. (4) The geometric characteristics of faults determined the radiation intensity and radiation area of the fault-slip stress waves, which significantly affected rockburst. The rockburst risk was higher in the roadway in the main radiation area of the S wave. Mechanical-parameter steepest descent, a numerical simulation method, provides a reference for simulating stress waves generated by fault slip. The results provide a basis for understanding the occurrence mechanism of fault slip rockburst and predicting the fault slip rockburst in real engineering.
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Yuan Jing,Chunwei Zhang,Su Zhang,Guangyi Lin,Huidong Cao,Jiahui Wen,Zonglong Wang,Yuanyuan Niu,Zetao Lin 한국고분자학회 2023 폴리머 Vol.47 No.6
The application of vegetable oil-based softeners canola oil and cottonseed oil in Solution polymerized styrene-butadiene rubber (SSBR) system composites was investigated. The results showed that when the aromatic oil was replaced by 5 parts of vegetable oil-based softeners in equal amounts in the base formulation of SSBR system, the work-ing performance of the rubber was better, the tear strength and elongation at break were improved and the tensile strength was reduced; the vulcanization time of the rubber prepared with vegetable oil-based softeners was significantly reduced compared with that of aromatic oil; the glass transition temperature of the rubber was significantly reduced and the cold resistance and snow performance of the rubber were improved.
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