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Local Weakening Laws and Energy Transformation of Roadway Surrounding Rock with Structural Planes
Arabian Journal of Geosciences Pub Date : 2020-05-18 , DOI: 10.1007/s12517-020-05411-w Shukun Zhang , Nannan Tang
Arabian Journal of Geosciences Pub Date : 2020-05-18 , DOI: 10.1007/s12517-020-05411-w Shukun Zhang , Nannan Tang
Coal resources are major energy resources for consumption in China. As the exploration of coal resources gradually turns to deep mining, the problem of supporting roadways in rock with structural planes under high ground stress is becoming increasingly significant. This research takes a support project of surrounding rock with structural planes in the Bai Yang Ling Coal Mine as the research object. To better support roadways in areas with local structural planes, this study conducts a methodological analysis, laboratory tests and field investigations to comprehensively explore the mechanical properties of areas with structural planes around roadways and to determine the influence of the structural planes on the weakening of local areas of roadway surrounding rock and the energy transformation laws during this surrounding rock weakening. Based on the Mohr-Coulomb failure principle, the influence of structural planes on the overall stability of rock samples is methodologically analysed, and failure criteria are determined. Through a loading test, the impact of areas between structural planes on the weakening of the strength and stiffness and the stress-strain relationship of rock samples is investigated under the influence of both internal and external factors, and the energy transformation process of rock samples weakened by structural planes is analysed. A concept for controlling local weakening of the roadway system is proposed, and measures for controlling the weakening of the structural planes around roadways are verified through field tests. The test results show that the strength, stiffness and stability of rock samples are controlled by areas of local weakening formed by structural planes rather than by traditional single-point failure; the location and shape of the weakening areas change with the change in the internal and external factors acting on the rock samples; the dislocation and failure of samples under the influence of the structural planes directly increase energy dissipation and reduce the elastic energy reserve; the closer the dip angle of the structural plane is to 60°, the more sensitive the strength, stiffness and stability of rock samples in the areas weakened by structural planes, and the worse the stability of the roadway surrounding rock; additionally, for structural plane dip angles ranging from 45° to 60°, increasing confining pressure may be the best way to restrain the weakening of the strength and stiffness of rock.
更新日期：2020-05-18
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