群桩条件下刚性桩加固斜坡软弱地基路堤稳定性分析  

Stability of embankment on sloped weak ground reinforced by rigid group piles

作　　者：孙永恒 马露[1,2,3] SUN Yongheng;MA Lu(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University,Nanjing 210098,China;Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University,Nanjing 210098, China;Anhui Science and Technology University, Bengbu, Anhui 233100, China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]河海大学江苏省岩土工程技术工程研究中心,江苏南京210098 [3]安徽科技学院建筑学院,安徽蚌埠233100

出　　处：《河北工程大学学报（自然科学版）》2018年第4期44-50,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(41772311);浙江省自然科学基金资助项目(LY17E080016);安徽省高等教育振兴计划项目(2015ZYTZ044)

摘　　要：针对刚性群桩加固斜坡软弱地基路堤的应用还不充分问题。通过有限元软件ABAQUS建立刚性群桩加固斜坡软弱地基路堤的三维数值分析模型,对比分析了刚性桩桩距、桩身弹性模量等设计参数对桩内力、变形的影响及其对路堤加固效果的影响。研究表明:经刚性群桩加固后,斜坡软弱地基的整体稳定性得到显著提高;与无桩加固相比,路堤最大沉降值减小约1.5～1.93倍,地基的侧向变形值减小约1.46～2倍;随着刚性桩弹性模量、嵌固深度增加,刚性桩的受力状态影响不大,刚性桩最大竖向应力和最大桩身土压力的变化幅度均小于10%;桩距对刚性桩的受力状态、水平位移影响较为显著;对比分析桩距和桩弹性模量对路堤沉降值的影响,研究发现桩距是影响路堤沉降的主要因素。因此综合考虑路堤稳定性、桩身受力以及工程的经济性,本工程刚性群桩桩距选择为2 m,弹性模量选择为10 GPa。Anti-slide pile has been used widely in constructing embankments on sloped weak ground,but the application of rigid group piles to strengthen embankments on sloped weak ground is still insufficient.Based on the numerical simulation,a comprehensive investigation on the sloped weak ground reinforced by rigid piles was conducted by using software ABAQUS.The paper studies the influence of piles design parameters such as pile spacing,elastic modulus on its internal forces and deformation.Compared with the reinforcement without piles,the maximum settlement value of the embankment decreased by1.5-1.93times,and the lateral deformation value of the foundation decreased by1.46-2times.With the increase of the elastic modulus of rigid piles and embedded depth,the stress state of rigid piles does not significantly increase.The impact of pile spacing on rigid piles is significant.With the increase of elastic modulus and pile spacing,the reinforcement effect is improved in some extent.It is found the pile spacing is more effective to reduce the pavement settlement value of the embankment compared with the elastic modulus.Under the consideration of the factors such as the stability of embankment,force,economy etc,the pile group spacing of rigid pile group is2m,and the elastic modulus is10GPa in this project.

关 键 词：道路工程 斜坡软弱地基 路堤 刚性群桩 ABAQUS 

分 类 号：TU751.4[建筑科学—建筑技术科学]