应用点安全系数分析基坑边坡三维稳定性

发布时间：2018-05-27 21:31

本文选题：基坑 + 边坡　；参考：《岩土力学》2014年06期

【摘要】：复杂基坑边坡具有明显的三维效应,目前计算方法尚不便准确计算其三维稳定性,不便于确定其空间失稳范围。在三维数值计算结果的基础上,选用Bezier双三次曲面对通过节点的位移等值面进行拟合,以位移等值面作为基坑边坡局部破坏面,据此计算出垂直破坏面的正应力和滑动方向的剪应力,提出新的点安全系数定义为该点抗剪强度与滑动方向上剪应力的比值,整体安全系数为等值面上点安全系数对面积的加权平均值。分析了某师范大学基坑边坡的稳定性,结果表明,点安全系数在剖面分布上呈中部小,内、外高的分布特征,小于1.06的区域从坡脚延伸至坡顶,揭示了滑动面的位置,最危险滑动面为15 mm的位移等值面。通过与刚体极限平衡法比较,验证了特定剖面上二者计算结果的一致性。
[Abstract]:The slope of complex foundation pit has obvious three-dimensional effect. At present, it is not convenient to accurately calculate the three-dimensional stability of complex foundation pit slope and to determine its spatial instability range. On the basis of the results of 3D numerical calculation, Bezier bicubic curved face is selected to fit through the displacement isosurface of the node, and the displacement iso-surface is used as the local failure surface of the slope of foundation pit. Based on this, the normal stress of the vertical failure surface and the shear stress in the sliding direction are calculated, and the new point safety factor is defined as the ratio of the shear strength of the point to the shear stress in the sliding direction. The overall safety factor is the weighted average of the area of the point safety factor on the isosurface. The stability of foundation pit slope of a normal university is analyzed. The results show that the distribution of the point safety factor is small in the middle, high in the inside and outside, and the area less than 1.06 extends from the foot of the slope to the top of the slope, revealing the position of the sliding surface. The most dangerous slip surface is 15 mm displacement isosurface. By comparing with the rigid body limit equilibrium method, the consistency of the two results is verified.
【作者单位】：西南交通大学土木工程学院;重庆交通科研设计院;
【基金】：国家自然科学基金(No.51178402) 交通运输部科技项目(No.2011 318 740 240) 中央高校基本科研业务费专项资金资助
【分类号】：TU47

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