动载荷下边坡的失稳分析

Unstable Analysis of Slope under Dynamic Loading Condition

根据公路和铁路承载结构以及载荷性质的不同,利用LUSAS有限元分别对两种动载的属性进行了分析,得出了两种载荷的位移、应力的时程曲线和应力变化轮廓,以及两种不同结构体的本征值与振动频率的关系,利用这些结果得出了两种动载荷的“有害频率”和“有害动载时间”,根据动载属性分析,结合实际事例,利用FLAC分别对这两种不同载荷对边坡的扰动情况进行了比较系统的数值分析.

According to the difference of bearing structures between railway and highway under the dynamics key properties of the dynamic loading were analyzed by LUSAS FEM. The curves of displacement on the vertical direction and stress versus dynamic time as well as the relationship between eigenvalues and dynamics frequency about the railway and highway were obtained. The hurtful frequency and hurtful dynamic time of dynamic loading were acquired from analytic results. Combined with a in-situ engineering case of a soil-masses slope, located in Shandong province on No.205 national highway, a numerical model under the two dynamic loading was built by using FLAG. Four different loading conditions worked on the unstable mechanism of soil slope were discussed respectively.