Analysis of surrounding rock damage law of TBM tunneling roadway in coal mine jointed strata

In order to research surrounding rocks failure characters and behaviors of TBM tunneling roadway in jointed strata, the paper takes methane drainage roadway of 1413A fully mechanized coal face in Zhangji　Coal Mine as engineering case, the surrounding rocks failure characters and behaviors under TBM tunneling condition was studied by establishing UDEC discrete element method numerical model according to the site lithological conditions, joint development characteristics and geo-stress field conditions. The research results show that: joints and fracture distribution characters are main influential elements of roadway surrounding rock failure; damage and failure of rocks are prone to happen on the cross area of joints; in engineering practices, roof support and collapse prevention should be taken as the first priority. In-situ monitoring results are in good agreements with simulation results and the adopted research methodology are able to represent the in-situ conditions.