In view of the serious crushing of the surrounding rock in the over-stress area during the back mining of 15210 working face in Yuxing coal mine,which leads to the collapse of the road gang,the span of the roof plate and the deformation of the monolithic column,as well as the large amount of shrinkage of the return wind tunnel and the difficulty of the end bracket shifting,etc.,it is decided to adopt joint support measures such as"hydraulic retractable steel shed,walking towards the step-type anchor sling,truss anchor"and so on in the over-stress area by means of technological research.Through the technical research,it is decided to adopt"hydraulic retractable steel shed+walking anchor sling+truss anchor cable"and other joint support measures for the over-stress area,and through the practical application effect,the instability of surrounding rock in the stress area is effectively controlled,and significant application results have been achieved.
comprehensive mining working faceoverstress areajoint supportapplication analysis
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