摘要
Abstract
In order to determine the supporting parameters of transportation roadway in the 23 east wing mining area of Qiwu Coal Industry,the specific supporting parameters of the surrounding rock of the roadway were calculated by using loose circle theory and suspension theory,and verified by numerical simulation and field practice.The results show that:Based on the loose circle theory,the height of the roof loose circle is Ls=3.44 m,the loose circle of the two sides is Le=2.69 m,and the length of the anchor rod is 3 200 mm,and the length of the anchor cable is 6300mm,which can effectively pass through the range of the loose circle of the surrounding rock of the roadway.Through numerical simulation,compared with the roadway without any support form,the horizontal surrounding rock displacement of the roadway is reduced by 45.67％,the vertical displacement is reduced by 44.74％,and the failure depth and area of the plastic zone of the surrounding rock of the road-way floor are basically unchanged.Through on-site monitoring,the displacement of the two sides of the roadway＞the dis-placement of the roof＞the floor heave amount,the maximum displacement reaches 143 mm,105 mm and 22 mm,respective-ly,and the deformation of the surrounding rock of the roadway is smaller,thus meeting conditions for production.关键词
松动圈理论/悬吊理论/支护参数/位移量Key words
loose circle theory/suspension theory/support parameters/amount of displacement分类
矿业与冶金
