基于三维精细模型的水利工程高边坡稳定分析

Analysis of High Slope Stability of Water Project Based on 3D Refined Modeling

水利工程高边坡的稳定分析对于边坡支护措施的设计具有重要意义,二维边坡稳定分析无法考虑坡面和岩层的空间变化,不能满足高边坡稳定分析的精度要求。充分考虑边坡体地形、地质的空间形态变化,通过建立基于地形、地质精细模型的三维边坡开挖模型,采用基于强度折减法的三维有限元软件,实现对水利工程高边坡三维开挖的稳定分析。以西藏某水利工程为例,分别通过二维边坡分析和三维边坡分析计算在不同工况下的稳定系数和滑动带,结果表明,与二维分析相比,三维边坡稳定分析得到的结果更加符合工程实际。

High slope stability analysis of water project is very important for the design of slope supporting.Because spatial variation of surface and strata cannot be considered,2D slope stability analysis cannot meet the accuracy requirements.In this paper,the spatial variation of ter?rain and geology of slope was fully considered.By establishing a 3D slope excavation model based on topographic and geological fine models and using the 3D finite element software based on strength reduction method,the 3D high slope stability analysis of water project was real?ized.Taking a water project in Tibet as an example,the safety factor and sliding zone under different conditions of 2D and 3D slopes were calculated respectively.The results show that comparing with 2D analysis,the analysis of 3D is more consistent with engineering practice.