Clarifying the pressure relief space effect of protective layer mining is crucial for optimizing the layout of mine development.Taking Hulusu Coal Mine as the engineering background,the distributed fiber optic sensing technology was adopted for monitoring the deformation of coal and rock mass.According to the spatial position relationship of working face mining and the change state of light sensing data,the dynamic change characteristics of the strain distribution of underlying coal and rock mass were analyzed,and the dynamic change process of stress increase,stress decrease,and stress recovery experienced by the underlying coal and rock mass during the mining of the upper protective layer was obtained.The significant differences in the scale of strain increase and decrease in coal and rock masses under different depth conditions were revealed,and the parameters of the relief protection range for upper protective layer mining were obtained as follows.The relief angles of dip and strike were 63.6° and 58.7°,respectively,and the relief lag distance and the maximum depth were 14.2 m and 28.4 m,respectively.The research results can provide an important reference for the promotion and application of distributed fiber optic sensing technology in monitoring the pressure relief effect during the mining of protective layer.
关键词
分布式光纤传感技术/上保护层开采/卸压效应/工业试验
Key words
Distributed fiber optic sensing technology/Mining of upper protective layer/Effect of pressure relief/Industrial test
维普
万方数据