降雨入渗条件下锚固边坡稳定性数值分析.doc

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降雨入渗条件下锚固边坡稳定性数值分析#
言志信,高刚*
(兰州大学土木工程与力学学院,西部灾害与环境力学教育部重点实验室,兰州 730000)
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摘要:采用有限差分软件 FLAC2D 建立某一公路边坡的数值模型,分析了不同的降雨雨型
对锚固前后边坡稳定性的影响。结果表明:雨强增加的情况下第一级边坡的饱和区最大,其
次为雨强不变以及雨强减小的情况。锚固前相同高程处,雨强减小的情况下,坡面监测点的
位移最大,雨强不变及雨强增加条件下位移依次减小。锚固后坡面监测点的位移明显减小,
边坡的安全系数变大。降雨作用后锚杆的轴力和剪力均增大,不同降雨条件下,锚杆相同部
位的轴力和剪力均相近。
关键词:降雨入渗;边坡稳定;锚杆支护;数值分析
中图分类号:TU432
Numerical Analysis on the Stability of Anchoring Slope
under Rainfall Infiltration
YAN Zhixin, GAO Gang
(Key Laboratory of Mechanics on Disaster and Environment in Western China, Ministry of
Education, School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, 730000)
Abstract: A numerical simulation model of a highway slop was established by applying finite
difference software FLAC2D. Analysised the stability of the slope whether supported with bolts or not
under rainfall infiltration with different rainfall patterns. The results showed that the saturation region
of the slope was the largest when the rainfall intensity increased of the rainfall pattern, following with
the uniform rainfall intensity and rainfall intensity decreased. The displacement of the slope was the
largest when the rainfall intensity decreased of the rainfall pattern at the same elevation before the
slope supported with bolts, following with the uniform rainfall intensity and rainfall intensity increased.
There was