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基于非饱和土强度理论与简单条分法,分析了渗流作用下土坡稳定性降低的机理;运用GTS软件通过接触单元考虑结构面,建立应力渗流耦合作用下含结构面土坡稳定分析模型;采用强度折减法与极限平衡法进行渗流边坡稳定分析。结果表明:运用单纯塑性贯通区来判定土坡失稳存在不足之处;数值计算安全系数采用强度折减法与极限平衡法计算结果非常接近,可运用极限平衡法进行安全系数求解;结构面与土中水渗流对边坡的变形、应力和稳定性影响显著,边坡稳定分析要充分考虑结构面和渗流的影响。
Based on the unsaturated soil strength theory and simple bar method, the mechanism of soil slope stability under seepage is analyzed. The stability analysis model of soil-soil slope with structural surface under the coupling of stress and seepage is established by GTS software. Stability analysis of seepage slope with strength reduction method and limit equilibrium method. The results show that the simple plastic penetrating zone is used to judge the instability of soil slope. The numerical calculation of the safety factor using the method of strength reduction and the limit equilibrium method is very close, and the safety factor can be calculated by using the limit equilibrium method. Water infiltration on the slope deformation, stress and stability significantly affected the slope stability analysis to take full account of the impact of the structural surface and seepage.