基于有限差分FLAC~(3D)的边坡稳定分析及工程对策

以鹤岗3052项目cE段边坡工程为背景,结合现场测试数据,运用有限差分法FLAC~(3D)对边坡稳定性进行数值模拟分析,探究坡体发生变形破坏的原因及其影响因素,进而提出相应的工程对策。分析结果表明:边坡局部白浆土夹层遇水软化、抗剪强度大幅降低且形成边坡滑塌破坏潜在滑动面,是坡体发生变形破坏的主要原因;白浆土分布是边坡稳定性的主要控制因素。据此,后续工程建设应对白浆土的分布进行详实准确勘察,结合工程地质条件对白浆土分布集中区域坡体采用削坡减载法处理。

Slope stability analysis and engineering measures based on finite difference method FLAC3D

This paper,drawing on the engineering background typical of CE segment slope collapse in Hegang 3052 project,describes the numerical simulation of slope stability using the FLAC3D finite difference method and combined with field monitoring data,the exploration of the causes and influencing factors triggering the slope deformation destruction,and the consequent application of the corresponding engineering countermeasures.The results suggest that the sharp reduction of shear strength produced by the softening of local soil interlayer in white pulp slope due to water,and the resulting occurrence of potential sliding surface of slope failure are mainly responsible for slope deformation and failure; the distribution of white pulp soil is the main factor controlling the slope stability.It follows that the further construction implies the necessity of achieving an accurate and detailed survey of the distribution of white pulp soil and controlling the slopes found in the areas with concentrated distribution of white pulp soil,by virtue of cutting slope and reducing load,as is dictated by actual engineering geological conditions.