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以非饱和土土水特征曲线为依据,建立了可同时考虑基质吸力与体积含水率影响的非饱和土强度公式,进而以非饱和土广义黏聚力和饱和土的内摩擦角为强度参数,将强度折减有限元理论推广到了非饱和土边坡的稳定性分析中。在短时地震荷载作用时间段内不考虑非饱和土含水率(或饱和度)与基质吸力变化的前提下,采用黏弹性人工边界模拟地基辐射阻尼的影响,建立了基于静动力有限元的非饱和土边坡地震稳定性简化分析方法,并以有限元数值计算、关键点相对位移时程曲线是否收敛和塑性区分布分别探讨了非饱和土边坡的地震稳定性。分析结果显示基质吸力虽然对非饱和土边坡的静力稳定性影响显著,但地震作用力仍然在边坡的地震稳定性分析中起主导作用。
Based on the unsaturated soil-water characteristic curve, the formula of unsaturated soil strength which can consider both the matrix suction and the volumetric water content is established. Based on the generalized cohesion of unsaturated soil and the internal friction angle of saturated soil, The finite element theory of strength reduction is generalized to the stability analysis of unsaturated soil slopes. Under the premise of non-saturated soil moisture content (or saturation) and substrate suction change within a short period of time, the viscoelastic artificial boundary is used to simulate the influence of radiative damping on the foundation, and a static and dynamic finite element method based on static and dynamic finite element method A simplified analytical method for the seismic stability of saturated soils slopes is presented. The seismic stability of unsaturated soils slopes are discussed by means of finite element numerical calculation, whether the key points are relative displacement time-history curves convergent and the plastic zone distributions respectively. The results show that while the matrix suction has a significant influence on the stability of unsaturated soil slopes, the seismic forces still play a leading role in the analysis of the seismic stability of slopes.