Stress evolution law and sectional control technology of surrounding rock in heading for adjacent advancing working face
In order to grasp the stress evolution law of surrounding rock of heading for adjacent advan-cing roadway,determine reasonable support method and improve support effect of the roadway,taking the adjacent transportation roadway of fully mechanized mining face in a mine as engineering back-ground,the deformation characteristics of surrounding rock in slow deformation stage,influence stage of advanced mining,severe influence stage,structural adjustment stage and deformation stability stage were analyzed by means of theoretical analysis,numerical simulation and industrial test,and the tech-nology of surrounding rock subsection control is put forward.The results show that:The roadway is af-fected by the excavation disturbance more than 50 m before the meeting between mining face and adja-cent excavation face.In the 50～20 m before the two working faces meet,the roadway is gradually af-fected by mining.From 20 m before the two working faces meet to 10 m after the two working faces meet,the roadway is greatly affected by mining,the surrounding rock is deformed violently,so the road-way support should be strengthened in the process of severe stress adjustment;10～50 m after the en-counter,the narrow coal pillar is deformed violently;50～100 m after the meeting,the excavation face is gradually far away from the mining face,and the influence of the roadway is gradually reduced.The 100 m range before and after the meeting of the two working faces is the key area for stable control of the surrounding rock in the roadway,the combined support of high strength bolt and anchor cable is a-dopted,and the control effect of roadway surrounding rock is good.
heading for adjacent advancing working faceroadway driven along next gobstress evolu-tionsectional controlroadway support
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