软基堆载对邻近桥桩作用的数值分析

发布时间：2018-08-02 17:18

【摘要】：基于研究软基堆载对邻近桥桩性状的复杂作用以及探讨对应软土地基加固方法的原因,采用有限元分析软件PLAXIS8.2对广深沿江高速公路深圳段海滨大道后施工堆载对邻近沿江高速桥桩性状的影响进行研究。通过对软基土层、堆载位置、堆载大小对邻近桥桩性状的影响,以及对两种软土地基加固方法效果进行比较分析,研究结果显示软基土层的塑性破坏是引起邻近桥桩应力和应变的根本原因,堆载距离相比堆载大小对邻近桥桩的性状影响更为明显。另一方面,对该滨海大道软土地基,采用水泥搅拌桩法(保证桩长、桩径)或强夯块石墩法(穿透亚黏土层)进行加固处理,都能有效减小土体的侧向位移和土体的沉降,减小对邻近桥桩的侧向作用,从而使变形控制在允许范围内以及保障桥桩安全使用。
[Abstract]:Based on the study of the complex effect of soft foundation surcharge on the behavior of adjacent bridge piles and the reasons for the corresponding reinforcement methods of soft soil foundation, By using finite element analysis software PLAXIS8.2, the influence of pile load on pile behavior of adjacent high speed bridge along the Yangtze River is studied by means of the construction load behind the Shenzhen section of Guangzhou-Shenzhen Expressway. The effects of soft soil layer, surcharge location and load size on the behavior of adjacent bridge piles are analyzed, as well as the effects of two methods for strengthening soft soil foundation. The results show that the plastic failure of soft soil layer is the fundamental cause of the stress and strain of adjacent bridge pile, and the influence of surcharge distance on the behavior of adjacent bridge pile is more obvious than the size of surcharge. On the other hand, for the soft soil foundation of Binhai Avenue, cement mixing pile method (ensuring pile length, pile diameter) or dynamic tamping block stone pier method (penetrating subclay layer) can effectively reduce the lateral displacement of soil and the settlement of soil. The lateral effect on the adjacent bridge pile is reduced so that the deformation is controlled within the allowable range and the safe use of the bridge pile is ensured.
【作者单位】：北京科技大学土木与环境工程学院;
【分类号】：U443.15

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