降雨强度对川藏公路102滑坡群2~#滑坡体影响

Effect of Rainfall Intensity on the 2#Landslide of Sichuan-Tibet Highway 102 Landslide Groups

为了研究降雨强度对102滑坡群2~#滑坡体塑性应变与位移影响,在渗流~应力耦合机理的基础上,利用ABAQUS有限元数值软件建立滑坡体简化模型,模拟不同降雨强度条件下,相同降雨时间后滑坡体的塑性应变与位移变化。数值分析结果表明:在降雨历时相同的前提下,随着降雨强度的增大,塑性应变与位移均增加,降雨强度为12 mm·d^(-1)、24 mm·d^(-1)、36 mm·d^(-1)时,滑坡体塑性应变与位移变形较小,边坡处于稳定状态,降雨强度为48mm·d^(-1)时,6 d以后边坡塑性应变迅速增大,形成塑性贯通区域,滑坡体失稳从而发生滑坡。

In order to study the effect of the rainfall intensity on the 2#Landslide body of Sichuan-Tibet Highway Route 102 landslide groups on plastic strain and displacement,this paper presents a simplified numerical landslide model established by using ABAQUAS finite element software.In the numerical analysis,the seepage-stress coupling method was used to simulate the plastic strain and displacement in landslide body different rainfall intensity but the same duration conditions.Numerical analysis results show that,under the same rainfall duration,with the increase in rainfall intensity,the plastic strain and displacement increase.Under the rainfall intensity of 12 mm/day,24 mm/day,36 mm/day,respectively,the plastic strain and displacement in the landslide body are small.When the slope is under a steady state with the rain intensity of 48 mm/day,and the plastic strain is rapidly increased after 6 days.A continuous plastic strain zone was formed in the potential landslide body and the slope instability was occurred.