Because the burial depth of Yi'an coal mine westside developing roadway is large and of which cen-trally affected by fault,the floor heave issues is outstanding,it seriously affects the roadway driving speed.In order to control the stability of surrounding rock,deeply analyzes the reason of floor heave aiming at the surrounding rock me-chanics environment and geological conditions around the westside alleys.According to the mechanism and cause of floor heave,formulates the secondary long ring support rigid supporting on the basis of first supporting of full -time anchor net cables.Through the industrial test of the program,the stress distribution of westside roadway obviously im-proves,effectively controls the heaving floor in the region,the subsidence quantity of roadway roof is 50 mm,and the displacement of roadway two sides is less than 15 mm.%义安矿西翼开拓大巷埋深大，同时受断层的集中影响，巷道底鼓问题突出，严重影响巷道的掘进速度，为控制其稳定性，针对西翼大巷周围的围岩力学环境及地质条件对底鼓原因进行深入分析，依据该区域底鼓机理及成因，在全锚网索一次支护的基础上，制定二次长环形支架刚性支护。通过该方案的工业性试验，西翼大巷应力分布状况明显改善，有效控制了该区域的底鼓问题，煤巷顶板下沉量为50 mm，而巷道两帮的移近量＜15 mm．
展开▼
