Optimization of Fully-mechanized Mining Technology of 22309 Working Face of Zuoyun Changchunxing Coal Industry Co.,Ltd.
Collapse column is an important geological structure that restricts the smooth advance of coal mine working face.Taking 22309 working face of Zuoyun Changchunxing Coal Industry Co.,Ltd.as the object of analysis,the technical problems faced by the fully-mechanized mining face in passing through collapse column were analyzed,and the technology of deep hole pre-split blasting was pus forward according to the actual conditions of the working face.At the same time,in order to ensure the safety of the advancing of the working face,the composite roof support measures combining grouting reinforcement and advance pipe shed support were designed.From the field application situation,after deep hole pre-split blasting,the overall work difficulty of the shearer rock breaking decreased significantly,the failure probability of the shearer decreased from 15%to 4%,the maintenance cost of various types of equipment decreased by nearly 5×105 yuan,and the advancing speed of the working face increased to about 7 m/d.From the view of the support of fully-mechanized mining face,the initial support force and working resistance of the support exceeded 95%of the maximum load when the face passed through the collapse column.In the whole process of the working face passing through the collapse column,there was no problem of roof breaking and caving,which effectively ensured the safety of the working face.
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