不同交界面对二元结构边坡破坏影响试验研究

摘要

Double-decked slopes are common in practical engineering ,and their failure modes are greatly affected by the interfaces .In order to study the influence law of different interfaces on the failure modes of double-decked slopes ,the failure mechanism of these slopes were deeply discussed here .Moreover ,failure modes of double-decked slope models with different interfaces under static load were observed ,and the failure process was simulated by numerical simulation tests .The results showed that the motion trajectory of the measurement point and the angle between the slope and the hor-izontal plane increased gradually from the toe to the top of the slope ,while the motion trajectory of the measurement points which were in the same row and the angle between the slope and the horizontal plane increased gradually from the surface to the inside of the slope .The displacements were mainly horizontal around the slope toe ,but vertical at the top of the slope with the largest horizontal displacement located on the interface at the middle section of the slope .The influ-ence of the variations of the interface rotation angle on the displacement of the lower deck of the slope was obtained through the analysis and discussion .%二元结构边坡在工程实际中常见，其破坏形式受交界面影响较大。为了研究不同的交界面对二元结构边坡破坏形式的影响规律，深入探讨二元结构边坡破坏机理。通过开展静载作用下不同交界面的二元结构边坡物理模型试验，直观观察到二元结构边坡的破坏形式，同时利用数值模拟试验手段，再现了二元结构边坡在荷载作用下破坏过程。试验研究表明：坡面处测点的运动轨迹与水平面的夹角从坡脚到坡顶逐渐增大，同一排测点的运动轨迹与水平面的夹角从坡面到边坡内部逐渐增大；坡角附近主要是水平向位移，坡顶主要是垂直向位移，最大水平向位移发生在交界面之上边坡中部位置。分析讨论得到了交界面转角变化对上下层土体位移的不同影响。