泥岩砂岩互层高边坡监测与数值模拟对比分析

Contrastive analysis of monitoring and numerical simulation of high slope with interbed of mudstone and sandstone

依托兰永一级公路某边坡治理工程的监测试验,对该类型边坡进行支护结构内力监测及坡体位移监测.对比监测过程中发现的若干问题进行数值模拟对比分析.监测及模拟结果表明,该边坡存在两处潜在的滑移-拉裂破坏面,分别由上部及中下部支护稳定.边坡中下部预应力锚索主要穿透结构面滑移层,对边坡稳定影响显著;该边坡锚索预应力施加完毕,预应力变化形式较以往形式相似,但与以往预应力变化规律相比锚索预应力回弹时间提前较多.锚索预应力变化阶段,坡体位移及支护结构内力呈现一定规律;由监测及模拟结果评价该边坡支护设计较为合理,由此为该类边坡支护设计提出相应建议.

Based on the monitoring experiment on harnessing project of a slope of Lan-Yong first-class highway,the slope displacement and internal force of supporting structure of this kind of slope were monitored and some problems discovered during the monitoring process were simulated numerically and analyzed comparatively.The monitoring and simulation result shows that：there are two potential sliding-tension damaged surfaces,which has to be stabilized with supporting structure at upper and middle-lower part of the slope.The prestressed anchor cable at middle-lower part of slope shall mainly penetrate through the slip layer,which will have a significant influence on the slope stability.When the prestressing of this slope anchor cable finished,the prestress change form will be similar to the previous one,but prestress recoil time is earlier than prestress change rule of the previous one.In the prestress changing period of the cable,the slope position and internal force of supporting structure will exhibit certain regularity.The evaluation of support design of this slope with the result of the monitoring and simulation will be reasonable,offering a relevant propose for support design of this kind of slopes,thereby.