降雨条件下抗滑桩边坡稳定性影响的数值分析  

Numerical analysis on stability of anti-slide pile slope under rainfall condition

作　　者：李宁[1,2] 赫建勇 许建聪[2] 张利伟[3] LI Ning;HE Jianyong;XU Jiancong;ZHANG Liwei(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 610081,Sichuan,China)

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]同济大学地下建筑与工程系,上海200092 [3]四川省城乡规划设计研究院,四川成都610081

出　　处：《水利水电技术》2020年第4期1-9,共9页Water Resources and Hydropower Engineering

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)。

摘　　要：针对降雨状态下的抗滑桩边坡的稳定性问题,为了将有限元强度折减法更加准确、有效地应用于降雨滑坡计算,基于Geostudio软件,运用迭代算法处理降雨入渗边界,获得边坡各时刻的水压分布,将场变量的有限元强度折减法与ABAQUS中提供的接触算法相结合,提出了降雨作用下抗滑桩边坡稳定性分析的有限元强度折减法。利用该方法分析了降雨条件下抗滑桩间距、桩位、桩长对抗滑桩边坡稳定性的影响,并与未考虑降雨时的影响规律进行对比。结果表明:桩间距越小,无雨情况下抗滑桩作用越好;而在降雨条件下,间距过小易形成桩间积水,不利于积水排泄,抗滑效果降低。当桩位于边坡中部时,无雨条件下抗滑桩作用最佳;而在降雨条件下,因坡脚具有较高的水力梯度,将抗滑桩置于坡脚时能够更好的起到抗滑效果。无论是否下雨,增加桩长长度,均能提高抗滑桩的抗滑效果。Aiming at the stability problem of anti-slide pile slope under rainfall condition,the rainfall infiltration boundary is processed with iterative algorithm based on the software of Geostudio,from which the water pressure distributions of the slope at all the moments are obtained,so as to apply the finite element strength reduction method more accurately and effectively to the calculation of rainfall-landslide,and then a finite element strength reduction method for analyzing the stability of anti-slide pile slope under rainfall condition is proposed through combining the finite element strength reduction method of field variables with the contact algorithm provided in ABAQUS.With this method,the influences from the spacing,position and length of anti-slide pile under rainfall condition are analyzed,which are compared with the influence law without considering rainfall.The result shows that the smaller the pile spacing is,the better the effect of the anti-slide pile is to be under the condition without rainfall,while under the condition of rainfall,if the spacing is too small,the water logging among the piles is prone to be formed,which is not favorable for the drainage of the waterlogging and the anti-sliding effect is to be decreased as well.When the pile is located in the mid-part of the slope,the effect of the anti-slide pile is the best under the condition without rainfall,while under rainfall condition,a better role of anti-sliding effect of the pile can be played if it is arranged at the toe of the slope due to the higher hydraulic gradient of slope toe.Whether rains or not,increasing the length of the pile can improve the anti-sliding effect of the anti-slide pile。

关 键 词：降雨滑坡 ABAQUS 抗滑桩 强度折减法 

分 类 号：U213.1[交通运输工程—道路与铁道工程]