Practice of Broken Surrounding Rock Control Technology in Bottom Pumping Roadways Under the Action of Dense Drilling
In response to the problems of surrounding rock deformation and fragmentation occur during dense drilling and drainage activities in the 3908 transportation bottom pumping roadway of Zhongmacun Mine,an innovative joint support and surrounding rock control technology of"roof full anchor cable support+fixed-point pregrouting+shotcrete"is designed and implemented.The full anchor cable support and fixed-point pregrouting technology are applied to the roof and roadway sides to reduce drainage and drilling disturbance,and the exposed surrounding rock is sealed by adopting shotcrete to reduce weathering and hydration risks.The implementation results show that the deformation amount of the roadway decreases by 86%,significantly improving the safety and stability of the roadway.
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