基于FLAC^(3D)进行堆载作用下边坡稳定分析

Stability Analysis of Slope under Preloading based on FLAC^(3D)

调查分析保腾高速公路五合立交区边坡工程地质条件,通过ANSYS、FLAC3D建立边坡复杂三维地质模型。运用FLAC3D模拟分析边坡在堆载作用下三维位移场、应力场分布规律,研究边坡岩土体力学响应特性及可能的内在变形破坏机理。由强度折减法计算其安全系数,结果与极限平衡法计算结果一致。综合分析评定立交区边坡整体处于稳定,后缘局部可能崩塌滑移,为工程开展提供依据。同时探讨了边坡不同位置的堆载作用对其稳定性的影响,得知此类坡体在坡脚及中部堆载对边坡稳定有利,中部尤为明显,坡顶堆载对其稳定极为不利。

On the basis of investigation of engineering geological conditions of slope in Wuhe interchange zone of PaulTeng expressway, this paper established a complex threedimensional geological model of slope using ANSYS and FLAC3D software. Also through FLAG3D , this paper simulated and analyzed threedimensional dis placement field and stress distribution law under preloading, then studied the mechanical response characteris tics and the most likely deformation failure mechanism of slope rock mass. Using the strength reduction method to calculate the safety factors, the calculation results were consistent with those of limit equilibrium method. Through analysis and assessment, the author believed that the landslide was in a stable state as a whole, but the parts on the trailing edge may collapse and slip, which provided the basis for further development of the project. This article also discussed the slope stability because of slope different locations＇ preloading. The re suits are obtained that such preloading at the foot and central heap of slope would be stability and favorable, and be more obvious at central, but preloading in the top of slope would be adverse extremely to its stability.