基于有限元极限平衡法的斜坡式护岸稳定性分析

运用静力极限平衡法和有限元极限平衡法,对典型斜坡式护岸设计断面的安全系数进行计算和对比,研究浸润面计算方法、水位差和坡顶荷载对边坡稳定安全系数的影响。计算结果表明:有限元极限平衡法计算出的有效剪应力场可以直观反映滑动圆弧的存在区域,计算结果相对保守;浸润面的计算方法对于复杂土体而言影响有限;由于孔隙水压力的影响,水位差因素对于静力极限平衡法和有限元极限平衡法计算结果的影响呈现相反趋势;随着坡顶载荷增加,静力极限平衡法和有限元极限平衡法的计算结果趋势相同,但简化的Fellenius法的计算结果和有限元结果更加接近。

Stability analysis of sloping revetment structure based on finite element limit equilibrium method

Using the static limit equilibrium method and finite element(FE)limit equilibrium method,we compute and compare the safety factors of the typical slope revetment design section,and research the influence factors on safety coefficient of slope stability,including the infiltration surface calculation method,water level difference and the load on top of the slope.The results show that the effective shear stress field calculated by the FE limit equilibrium method can intuitively reflect the existing area of the sliding arc,and the calculation result is relatively conservative;and the calculation of infiltration surface has a limited impact on the results of complex soils;due to the influence of pore water pressure,the calculation results of the static limit equilibrium method and the FE limit equilibrium method shows the opposite trend as the water level increases;with the increase of the load at the top of the slope,the results of the static limit equilibrium method and the FE limit equilibrium method have the same trend,while the results of the simplified Fellenius method are closer to the FE results.