基于FLAC^(3D)的土质边坡稳定性分析

Analysis of soil slope stability based on FLAC^(3D)

采用FLAC^(3D)模拟三维土体、岩体或其他材料力学特性,尤其是达到屈服极限时的塑性流变特性,在边坡稳定性分析中具有重要的应用。FLAC^(3D)已经在土质边坡稳定系数和边坡变形特征研究中被广泛应用。以兰州市某土质边坡为例,基于FLAC^(3D)方法,选取边坡中部两个典型剖面进行计算,分析其天然工况下塑性、剪应力变化、稳定性及变形趋势,并结合实际调查结果,验证计算参数选取的合理性。研究结果可知:在不考虑人为及其它因素影响的情况下,土质边坡在自然工况下基本稳定,但从实际模拟过程来看,模拟计算结果一般偏大。故综合认为,为使土质边坡在自然条件下稳定,边坡坡度应<45°。

FLAC^(3D) is used to simulate the mechanical properties of rock mass or other materials,especially the plastic flow changes properties when the yield limit is reached,which has an important application in slope stability analysis.FLAC^(3D) in soil slope stability coefficient and characteristics of slope deformation are widely used in the study a soil slope in Lanzhou city as an example,based onFLAC^(3D) method,selection of the slope in the middle of two typical section to calculate,analyze its natural conditions and plastic shear stress changes,the trend of deformation and stability and connecting with the actual survey results,verify the rationality of the calculation parameters selection research result:without considering the effects of man-made and other factors,the soil slope under natural conditions basically stable,but from the point of actual simulation,simulation results generally larger.Therefore,it is concluded that in order to make the soil slope stable under natural conditions,the slope gradient should be Less than 45.