Application and optimization of support technology in deep large section soft rock chamber

in order to solve the problem of deformation and instaility of deep large secion soft ock chanmber:taking the drive head chamber of west wing 11 coaltansportation roadway in Zhuixi Cal Mine as a studly object.the damage depth ofplstic zone and displacement of surounding were anal zed underfour dfferent suport plans and supor stouctures( bolt suppor,bot-shotcreting suppor.bot+-anchor suppor,bolt+anchorshotcreting support) by the means ofthoretical analysis and numeical simulation.The third couplig suppot was the best afer compaiscon four suppor plans. Thefed appication showed that the optimized scheme thee could effectively improve the whole loading abilties of support structure and self cading atilties of surrounding ock.The convergence vale of rib to rb of dive head chamiberwas 25.8 mn,the deformation value of roo tofoor was 43.45 m which control eff ctively b g deformation of deep surounding rock and ensure the stability of roadway in long term.