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| Study on zonal fracture characteristics and support parameter optimization of surrounding rock for deep soft rock roadway |
| Chang Chunfeng |
| Wuyang Mine, Shanxi Lu 'an Environmental Energy Development Co., Ltd., Changzhi 046102, China |
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Abstract To reveal the severe deformation and instability mechanism of surrounding rock in deep soft rock roadways and propose corresponding support schemes, the severely fractured zone of the No.8002 floor drainage roadway in the deep mining area of Wuyang Mine was taken as the research background. The FDEM numerical simulation method was adopted to analyze the tensile-shear fracture characteristics of roadway surrounding rock, as well as the stress distribution and displacement evolution laws of surrounding rock under different support conditions. The results indicated that the surrounding rock at two roadway sides was mainly fractured via tensile dilation and shear slip, and the roof and floor were dominated by large-deflection deformation. Tensile-shear cracks initiated from corner points were still observed when bolt (cable) supports were applied to the roadway surrounding rock. After grouting treatment was conducted on the surrounding rock, the overall bearing capacity of the roadway surrounding rock was significantly improved. Stress was concentrated at the four corners of surrounding rock, and tensile-shear fractures were effectively controlled.
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