老采空区输电线路地基稳定性评价方法

摘要

Foundation stability of transmission line must be evaluated on mined-out areas. Equilibrium analysis method can be used when transmission tower is on coalfield mined-out areas where buried depth is shallow and geological conditions are simple; on other mined-out areas, additional stress analysis method can be used; for important project,numerical analysis method must be used as an effective complement to other evaluation methods.%输电线路经过煤矿采空区，需进行地基稳定性评价。对于老采空区地段，当采空区为埋深较浅、地质条件简单的小煤窑采空区时，可采用力平衡分析法，计算临界深度用于进行地基稳定评价；其他老采空区地段，可采用附加应力分析法，计算冒落裂隙带发育高度与杆塔荷载影响深度，用于进行地基稳定性评价；对于重要工程和塔位，还应采用数值分析法作为其他评价方法的有效补充。