公路扩建刚性桩和竖向土工材料加固研究  

Research on reinforcement of vertical geotextile material and rigid pile for expressway widening on soft ground

作　　者：丰土根[1,2] 王路博 宋海洋[1,2] 陈阳[1,2] 胡松[1,2] 

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]河海大学岩土工程研究所,江苏南京210098

出　　处：《河北工程大学学报（自然科学版）》2015年第4期1-5,33,共6页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(51009054);教育部科学技术研究重点项目(109077);江苏省自然科学基金资助项目(BK2010513);中央高校基本科研业务费专项资金资助(2014B04914)

摘　　要：为控制软土地基公路拓宽工程中新旧路堤的差异沉降,提出一种新的软土地基处理方式,即综合应用刚性桩和竖向土工材料进行公路拓宽地基处理。为把握路堤荷载作用下综合应用刚性桩和竖向土工材料加固直接拼接方式的拓宽路堤工作性状,应用FLAC3D建立三维分析模型。通过数值模拟计算,从加固前后路堤的沉降、地基侧向位移和稳定性等方面进行了分析研究。计算结果表明:刚性桩和竖向土工材料的综合应用能够有效控制地基土体侧向位移,从而能够减小新老路基的总体沉降和路堤顶面的差异沉降,加固效果明显。A new foundation treatment method is put forward in this thesis. The widened foundation was handled by the integrated application of rigid piles and vertical geotextile material. For investigating the performance of widened embankment under the embankment loads with the direct connection method on soft ground improved by application of rigid piles and vertical geotextile material, a 3 D elastic-plastic finite difference model was established in FLAC3D. Through using numerical analysis, the settlement of widen embankment, lateral deformation and stability of the foundation were investigated from reinforcing or not. The results show that the comprehensive application of rigid piles and vertical geotextile material can effectively control the lateral deformation of foundation soil, thereby reducing the different settlement between the new and old embankment and surface, the reinforcement effect is obvious.

关 键 词：公路扩建 土工材料 刚性桩 侧向变形 数值分析 

分 类 号：TU43[建筑科学—岩土工程]