Study and practice of misaligned stress transfer technology for mining roadway
In the process of longwall mining in coal mine,in order to reduce the impact of mining on the roadway of adjacent unmined sections,it is necessary to leave coal pillars of more than 20 meters width,which greatly reduces the coal recovery rate.Stress transfer technology is an effective measure to reduce the stress and deformation of the surrounding rock of the roadway,it can not only reduce the stress of the roadway of adjacent unmined sections,but also improve the coal recovery rate.Taking the Zhenchengdi Mine of Shanxi Xishan Coal and Electricity Co.,Ltd.as the research background,the misaligned stress transfer technology for the mining roadway was studied through theoretical analysis,numerical simulation and on-site measurement methods.The main conclusions were drawn as follows:after the misplacement of the adjacent mining roadway,the stress of the gob-side entry driving of the subsequent working face was transferred to the deep coal;the gangue cushion layer had stress and energy dissipation effects,avoiding the influence of dynamic loads on gob-side entry driving,and easing the phenomenon of mine pressure behaviors by the gentle slope section;the top-level roadway in the misaligned stress transfer system for the misplacement gob-side entry driving was equivalent to a pressure-relief roadway,which had a good stress transfer effect.Compared with conventional methods,it did not require additional excavation of roadways,additional pressure relief holes,or additional blasting or hydraulic fracturing measures,while it could reduce costs.
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