Design And Research On Parameters Of Deep-covered Rock Entry Supported By Bolting And Shotcrete

All sorts of underground engineerings(such as railway tnnels,road tunnels,mine workings ,hydraulic tunnels,defence engineering and civil defenses,municipal passages,city subway and commecial buildingsunderground,etc) have been widely used both in civil and abroad for a long time The ordinary theories and methods that come from the bove-ground engineering can't be used to solve the problems of underground engineering ,for there are differences in surroundings and conditions between underground engineerings and above-ground ones. Maily according to the stability of the country rock and the technical paremeters of bolt and shotcrete lining ,some deep research has been done.Wulunshan allotment lies at Nayong county in Bijie area of Guizhou province ,lies among the villages of Shuangguang,Baixing,Zhongling,etc. In the field it is mostly covered by sedimentaryrock except eruptive rock (basalt of Emei Moutain)and there are mainly conbanate rocks which have good compression resistance ,so it usually won't cause engineering geology problem .The roof and floor of the main payable coal seams are silt mudstone ,mudstone,limestone ,fine sandstone,siltstone and argillaceous siltstone , etc. The lithological characters ,thickness and combinated relation are complexed and variable .The mechanical strength is different and stability is complexed and variable even for the rock with a same lithological character.The main inclient shaft excavated in those strata is 1316 meters in length and 13...