深基坑开挖中双排桩支护的数值模拟及性状  

Numerical simulation and characteristic of a double-row piles retaining structure for deep excavation

作　　者：王星华[1] 谢李钊[1] 章敏[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2014年第2期596-602,共7页Journal of Central South University:Science and Technology

基　　金：铁道部科技研究开发计划项目(2007G034)

摘　　要：为研究深基坑开挖中双排桩支护结构的内力和变形规律，结合实际工程，建立双排桩、预应力锚杆联合支护体系的数值计算模型，对不同开挖过程中桩一土相互作用机理、支护结构内力、变形和土压力分布特征进行研究，讨论排距、桩长和冠梁刚度等参数对基坑稳定性的影响。研究结果表明：锚杆作用部位桩身将产生较大的反向弯矩，基坑监测时应重点关注；当排距为（3-4）战其中d为桩的直径），桩长约为开挖深度的1．7倍时，双排桩结构将发挥较好的支护效果；适当增加冠梁刚度将有效地协调前后排桩，减小土体侧向位移。To study the excavation behavior supported by double row piles retaining structure, the interaction mechanism of pile-soil was established. By taking a practical engineering as the research object, a numerical model of double row piles and prestressed anchor combined support system were established, and the internal force and deformation of supporting structure, the distribution characteristics of earth pressure were studied. The influences of row spacing, pile length and crown beam rigidity on the stability of excavation were discussed. The results show that the bigger reverse bending moments appear on the site of action of anchor pile; a good supporting effect of double-row piles structure can be achieved when the row spacing is （3-4）d and the pile length is about 1.7 times of the depth of excavation. The before-and-after piles can effectively form a unified whole supporting structure, and the lateral displacement of soil can reduce and appropriately increase the stiffness of the crown beam.

关 键 词：双排桩支护结构 深基坑 数值模拟 影响因素 

分 类 号：TV551.42[水利工程—水利水电工程]