初始应力场对土坡稳定性分析结果的影响

摘要

In order to study the impact of initial stress field (considered as gravity field)on the result of slope stability analysis under different slope height,slope angle and unit weight of soil,18 slope examples were analyzed by using finite element method with shearing strength reduction. The result indicates that initial stress has large impact on displacement of slope base,displacement values when initial stress is not considered are larger than initial stress is considered. Initial stress also has large impact on shearing stress,but this impact is smaller than impact on displacement of slope base,values of shearing stress in slope base when initial stress is not considered are larger than initial stress is considered. It has very small impact on slope stability safe factor.%为研究不同坡高、坡角和土体容重条件下初始应力场（按重力场考虑）对边坡稳定性分析结果的影响，应用有限元抗剪强度折减法对18个边坡进行了分析。结果表明：初始应力场对边坡坡脚产生的位移影响较大，不考虑初应力时的位移值大于考虑初应力时的位移值；初始应力场对坡脚剪应力的影响也较大，但这种影响弱于对坡脚位移的影响，不考虑初应力时的坡脚剪应力大于考虑初应力时的坡脚剪应力；初应力对边坡稳定安全系数的影响很小。