Study by udec simulation of fully-mechanized caving roadway surrounding rock system

The roof and side of fully-mechanized caving roadway are coal and pillar which cause the stability problem extremely prominent. The fully-mechanized caving roadway of Nantun colliery is set as the prototype,its surrounding rock stability problem is analyzed by numerical simulation with distinct element method.The roof subsidence, horizontal displacement of pillar surface, vertical stress in pillar are collected to judge the stability of roadway and determine stable pillar width and way of supports.