基于FLAC/Slope模拟分析输电线路塔位边坡的开挖稳定性

摘要

塔位边坡的稳定性是输电线路基础设计考虑的一项重要内容.基于强度折减理论采用FLAC/Slope软件建立了输电线路典型塔位边坡的有限元分析模型,数值模拟了塔位边坡分步开挖施工过程,对各施工阶段的稳定性进行了评价分析,特别考虑了边坡稳定系数随边坡开挖步的变化规律.结果表明塔位边坡的坡脚或坡体分层处存在较大应力集中,且施工开挖步是影响边坡稳定系数变化的重要因素.%Stability analysis of the tower foundation slope is an important part in desiging the underlying base of the transmission tower Based on the theory of soil strength reduction this paper builds the FEA models for typical tower-base-slopes of transmission lines with the excavation progress of the slope simulated and the stability analyzed. and with special consideration given to the changing the slope stability factor with each excavation step.