摘要
目前对抗滑桩边坡稳定性的研究多集中于无雨状态下,而降雨是触发滑坡的主要诱因,因此有必要对降雨条件下抗滑桩边坡的稳定性进行研究。本文以ABAQUS软件为平台,采用Python语言及内置接口程序对其进行二次开发,基于迭代算法确定降雨边界,并考虑桩土之间的接触效应,采用饱和-非饱和渗流结合有限元强度折减法对降雨条件下抗滑桩边坡的稳定性进行数值模拟;并与不考虑降雨时得到的抗滑桩边坡稳定性结果进行对比研究。通过研究发现考虑与不考虑降雨所得到的抗滑桩边坡的稳定性变化规律是不同的:当不考虑降雨时,桩间距越小,抗滑桩的抗滑效果越好;而在降雨条件下,桩间距越小,越不利于雨水下泄,过小的桩间距反而起不到很好的抗滑效果。当不考虑降雨时,将抗滑桩置于边坡中部时,具有较好的抗滑效果,这与前人的研究结论是一致的;而在降雨条件下,坡脚处具有较高的水力梯度,此时将抗滑桩置于坡中与坡脚之间的位置能起到较好的抗滑效果。因此,在多雨地区设桩要充分考虑当地的降雨情况而选定桩间距及桩位。研究结论可为在多雨地区进行抗滑桩设计及布设提供参考依据。
Pile stabilized slope stability analysis is commonly conducted without consideration of rainfall;however,rainfall is the main factor that induce landslides,so the research on the stability of a slope reinforced with piles under rainfall conditions has to be further conducted. Secondary development on ABAQUS software using Python and internal program has been done firstly. Here,rainfall boundary condition was identified using iterative algorithms, and pile-soil interaction was considered, then saturated-unsaturated seepage combined with strength reduction method was employed to perform a three dimensional numerical analysis of the stability of a slope reinforced with piles under rainfall conditions. With comparison of the results obtained regardless of rainfall,some new understanding was achieved： with no consideration of rainfall,the smaller pile spacing will result in better anti-sliding effect. However,under rainfall conditions,stabilizing piles will prevent rainwater drainage in the slope; hence smaller pile spacing will have adverse effect on slope stability.Regardless of rainfall,the pile row needs to be installed in the middle of the slope for maximum safety.However,under rainfall conditions,the pile row needs to be installed in the position between toe and middle of the slope for maximum safety. So,in pluvial region,the regional rainfall conditions should be considered for identifying the spacing and position of the stabilizing pile in the slope. The results can provide references for stabilizing pile designing in high-precipitation areas.
作者
李宁
刘冠麟
许建聪
张利伟
李玉成
王晓
LINing;LIU Guanlin;XU Jiancong;ZHANG Liwei;LI Yucheng;WANG Xiao(School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China;Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;Sichuan Institute of Urban Planning and Design, Chengdu , Sichuan 610081 , China)
出处
《中国地质灾害与防治学报》
CSCD
2018年第3期38-46,共9页
The Chinese Journal of Geological Hazard and Control
基金
国家自然科学基金项目(40872179
U1765110)
上海市自然科学基金项目(16ZR1423300)
