Surrounding rock control technology combining internal support and external pressure relief in gob-side entry retaining
To control the serious surrounding rock deformation induced by mining in gob-side entry retaining,we take Shanxi Jincheng Coal Mine as the engineering background,to analyze the overlying rock movement law in different stages in gob-side entry retaining,clarified the focus of the surrounding rock control,determined to the synergistic control way of internal support and external pressure relief,and finally,used theoretical analysis,on-site application and monitoring to design,analyze and validate the flexible formwork concrete road-side support and the advance roof pre-splitting pressure relief blasting.The results show that,the gob-side entry deformed quickly within 100 m lagging behind the working face,and the pressure change of the flexible formwork wall was large and maximized within 200 m lagging behind the working face,so these should be the key point of maintenance;the optimized road-side support body met the bearing capacity of the roadway sidewall;the roadway support of the flexible formwork concrete wall and the advance roof pre-splitting pressure relief blasting worked synergistically to reduce the impact of mining stress,improve the stress environment and the support strength of the retained entry,which effectively improved the surrounding rock stability of the retained entry.
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