疏排桩支护结构内力与变形有限元数值分析  

Finite Element Analysis for Internal Forces and Displacement of Scattered Row of Piles Support

作　　者：李骏 古海东 

机构地区：[1]浙江沪杭甬高速公路股份有限公司,浙江杭州310007 [2]浙江省交通规划设计研究院,浙江杭州310006

出　　处：《现代交通技术》2015年第3期25-29,共5页Modern Transportation Technology

摘　　要：针对离心模型试验建立了三维有限元数值模型,通过与试验的比较验证了模型的可靠性,并与规范法中的m法进行了比较分析,最后结合悬臂排桩支护结构实例分析了桩身截面尺寸、桩间距和土体强度参数对桩身内力和变形的影响规律。研究结果表明：采用m法进行排桩支护结构设计偏于保守,与m法相比三维有限元法计算结果与离心机试验结果更为接近;桩身弯矩和桩顶水平位移随桩间净距的增加近似呈线性增加,随着土体黏聚力和内摩擦角的增加近似呈指数形式衰减。A three-dimensional FEM model was established according to the centrifuge and the reliability of this model was validated by centrifuge test. Then, this method was compared with m-method of the current specification. The effecting factors of the maximum bending moment and the head horizontal displacement of pile in combination with an assumed case of cantilever row piles are analyzed. The results show that the design of row pile retaining structure by m-method is conservative, threedimensional FEM method is more consistent with the centrifuge test results comparing with m-method. The bending moment and the horizontal displacement of pile linearly increasing with increase of pile spacing and decreasing with the increase of cohesion and internal friction angle of soil in index form.

关 键 词：排桩支护 离心模型试验 有限元法 桩身弯矩 桩顶水平位移 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]