水平成层土坡破坏机理及稳定性分析

发布时间：2019-05-24 03:19

【摘要】：采用室内模型试验及极限分析上限法对水平成层土坡破坏机理与稳定性进行研究。首先,构建室内模型分别模拟不同边坡高度与不同分层厚度条件下的水平成层土质边坡,分析在坡顶条形荷载作用下坡顶与坡面位移-荷载变化规律、极限承载力及破坏面形态和位置。基于极限分析上限法基本原理,针对水平成层土质边坡圆弧+直线的破坏模式建立机动容许速度场,推导该类边坡在坡顶条形荷载作用下极限承载力的求解公式,并将室内试验结果与数值分析结果进行对比分析。研究结果表明:水平成层土质边坡在坡顶条形荷载作用下的破坏模式为圆弧+直线组合式,其滑动面由凹向边坡体内部的圆弧曲面和平面2部分组成,圆弧曲面上端位于加载梁后缘处,下端处于填土分层处,平面为填土分层交界面;上限法在求解水平成层土质边坡稳定性问题上具有一定的合理性。
[Abstract]:The failure mechanism and stability of horizontal layered soil slope were studied by indoor model test and limit analysis upper limit method. Firstly, the indoor model is constructed to simulate the horizontal layered soil slope under different slope height and different layered thickness, and the displacement-load variation law of slope top and slope surface under strip load of slope top is analyzed. Ultimate bearing capacity and failure surface shape and position. Based on the basic principle of limit analysis upper limit method, the dynamic allowable velocity field is established for the failure mode of circular arc straight line of horizontal layered soil slope, and the formula for solving the ultimate bearing capacity of this kind of slope under strip load at the top of the slope is derived. The results of laboratory test and numerical analysis are compared and analyzed. The results show that the failure mode of horizontal layered soil slope under strip load at the top of the slope is a circular arc straight line combination, and its sliding surface is composed of two parts: circular arc surface and plane inside the concave slope body. The upper end of the circular arc surface is located at the back edge of the loading beam, the lower end is at the filling layer, and the plane is the interface of filling layer. The upper limit method is reasonable in solving the stability of horizontal layered soil slope.
【作者单位】：湖南科技大学土木工程学院;湖南科技大学岩土工程稳定控制与健康监测省重点实验室;
【基金】：国家自然科学基金资助项目(51208523) 湖南省科技厅一般项目(2012TT2039) 贵州省交通厅科技项目(2013-122-005)~~
【分类号】：U416.14

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