Engineering mechanics behavior and surrounding rock control of mine loose coal and rock roadway with high pressure gas

in order to solv the high deformation and control problens of the surounding rocks along the mine high pressure gas,loose and unstable coal and rockroadway under the condition of the complicated geology.a study was conducted with the site investigaton,theoretical anal ysis numercal alcu ation and engineering practices. Based on the acual deformation condition ,t sthowed tat the surounding rock deformation features of the mine roadwvay were obvious the deformation was harcto be controlld and the fll c.oss sectional onvergence was serious. The rock mechanics and other mechanics pricile were appied to the thecretcal analys. The paper held that the crack expansion ofthe coal and ock masses could inrease the permeatiliy of th coal and rock masses and thus the surounding ock strength wotld be continuously weakened.The numerical simulation means were applied to the analysi on the stress unloading and deformation features of the surounding ock aong the mine roadway with the gas pressure orwith no gas prssure. The higher gas pressure the higher deformation of the mine roadway would be. Fmally a design and optimized calculation were conducted on the orthogonal numercal an of the anchorage suppor. A人dep analysis was conducted on the clculatonresuitsBased othe relevance support principles,based on the pre- stress russ and anchor in the sidevall as the key support techmnodogythe tite aplitcaion resuts shover tha the fehnology would have an important role to improve the stabilty of the mine roadway surrounding rock.