Safety Analysis and Evaluation of Upper Roadway Tunneling through Faults in Confined Aquifers
In order to ensure the safe passage of the roadway through the fault,taking the 43lower mining area transportation downhill passing through the F43 Yun-1 fault of Qiwu Coal Mine as the research background,drilling and geophysical exploration methods are used to further accurately grasp the occurrence elements of the F43 Yun-1 fault and the water rich situation in front of the 43lower mining area transportation downhill roadway.Based on theoretical calculation and numerical simulation methods,the stability of the roadway surrounding rock and the safety of the roadway passing through the fault are analyzed and evaluated.The results show that the F43 Yun-1 fault has a drop of 21.0 m,and the overall water richness of the rock layer within a range of 100 m in front of the 43lower mining area transportation downhill roadway is relatively weak.After the excavation of the 43lower mining area transportation downhill,the rock mass in a certain range around the roadway shows a certain degree of pressure relief status.The pressure relief range of the surrounding rock is about the width of the roadway,and the stress concentration phenomenon is mainly located at the front end of the roadway.The fault has a relatively significant degree of impact on the stability of the roadway surrounding rock.The presence of the fault leads to obvious roof subsidence and heaving floor phenomena,and the failure depth of the roadway surrounding rock shows an increasing trend compared to normal strata.During the excavation process of the 43lower mining area transportation downhill,the thickness of the safe waterproof layer under the influence of three ash and Ordovician ash is significantly smaller than the actual waterproof layer thickness.Under the premise of monitoring,supervisory control,drainage,and emergency measures during the excavation process of the 43lower mining area transportation downhill,normal excavation can be achieved.
mining engineeringfault explorationsurrounding rock stabilitysafety evaluation
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