Research on Risk Identification and Safety Technical Measures for Excavation Working Face Continuous Passing Through Faults
Aiming at the continuous short distance exposure of faults F3107-3 and F3 in the excavation of the 13upper09 material roadway,with a drop of 2.5 m and 5.1 m respectively,the faults has a relatively large drop and is relatively close in distance,resulting in a significant coupling impact.Combined with the safety risk identification and safety technical measures research of the on-site carried out excavation working face continuous passing through faults in short distance.The research conclusion:When the excavation working face passes through faults continuously,there are significant risks,mainly including roof subsidence,collapse,fragmentation,local gas exceeding limits,gas accumulation,refusal to explode,and residual explosions;within a range of 5 m in front of and behind the fault,the tunnel is constructed according to a trapezoidal cross-section,with anchor mesh and cable shed injection support.When the cyclic footage is 0.8 m for permanent support and the maximum distance from the head to the empty roof is 1.2 m for composite support,an I-beam shed is erected within a range of 5 m in front of and behind the fault to strengthen support.The shed beam and legs are made of 11# mining I-beam,and for temporary support,3 metal front probing beams or light single hydraulic pillars are used.
excavation working facepass through faultrisk analysissafety technical measure
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