Study on surrounding rock failure mechanism and rational coal pillar width of the gob‐side coal roadway under influence of intense dynamic pressure

A reasonable width of the coal pillar is very important to surrounding rock control gob-side roadway. An unreasonable will make roadway be located within range strong mining influence, leading severe deformation Severe subsidence at side roof and serious are problems caused by dynamic pressure due in This paper studies instability mechanism rational under influence intense pressure. The results show that: (1) Under condition large height, overburden a hinged structure, an makes below main fracture line. rotary movement key block reason for deformation. (2) According evolution law stress field, displacement field plastic zone different widths during driving were studied, it concluded that 6-m-width most reasonable. (3) Based on distribution plasticizing narrow roadway, combined support scheme “anchor cable + grouting single prop” proposed applied engineering practice. practice well controlled, safe working face realized.