湿陷性黄土公路边坡抗滑桩加固的安全稳定分析  

Security and Stability Analysis of Collapsible Loess Soil Highway Slope Reinforced with Anti-Slide Piles

作　　者：刘慧萍[1] 张迪 李宝平[1] LIU Huiping;ZHANG Di;LI Baoping(School of Civil Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学建筑工程学院,西安710021

出　　处：《西安工业大学学报》2017年第12期888-893,共6页Journal of Xi’an Technological University

基　　金：陕西省教育厅专项科研计划(16JK13386)

摘　　要：为了提高高速公路边坡抗滑桩加固的安全稳定性,利用ABAQUS有限元分析软件建立了多层土质状况的三维多桩整体空间加固有限元模型,分析了剪胀角和抗滑桩相对位置对加固坡体安全稳定性的影响.结果表明:坡体安全稳定系数随剪胀角的增加而增大,且安全稳定系数的增加幅度趋于平缓;在距桩顶3/4桩长处弯矩达到最大;随着桩体加固位置的逐渐向坡顶移动,桩土接触压力为零的区域逐渐变大且变化趋势趋于平缓;桩前桩土接触压力的峰值随着桩体相对位置的的逐渐增大而呈线性增加;剪胀角为0°且相对位置系数为0.5时,采用抗滑桩加固的坡体相对于未加固的坡体安全稳定系数提高了约14.6%;桩体相对位置对坡体的安全稳定系数的影响近似呈正态分布.In order to improve the safety and stability of anti-slide pile reinforcement on highway slope,the finite element model of three-dimensional integral spatial reinforcement of multi-pile and multi layer soil condition is established by using ABAQUS finite element analysis software.The influence of the dilatancy angle and the relative position of the anti-slide pile on the safety stability of the slope is analyzed.The results show:The slope safety stability coefficient increases with the dilatancy angle increasing,and the increase of the safety stability coefficient is more moderate;Along the pile top downward,at 3/4 of the pile length,the bending moment reaches the maximum;As the position of pile reinforcement gradually moves to the top of the slope,the area with zero contact pressure becomes larger and the trend tends to be gentle;The peak of the soil contact pressure round the pile is increasing linearly with the increasing of the relative distance of piles;While dilatancy angle is 0°and the relative position coefficient is 0.5,the friction pile reinforcement improves the safety stability coefficient of slope about 14.6%,compared with the unreinforced slope;The effect of the relative position of the piles on the safety stability coefficient of the slope is approximately normal distribution.

关 键 词：公路边坡 抗滑桩 剪胀角 安全稳定系数 

分 类 号：U416.14[交通运输工程—道路与铁道工程]