砂层地基中预制管桩桩长对基桩沉降量的影响分析  

Analysis of the Influence of the Length of Prefabricated Pipe Piles on the Settlement of Foundation Piles in Sand Ground

作　　者：刘文龙 LIU Wenlong(No.2 Engineering Co.,Ltd.of China Railway 10th Group Co.,Ltd.Zhengzhou 450008,China;Henan Anluo Expressway Co.,Ltd.Zhengzhou 450003,China)

机构地区：[1]中铁十局集团第二工程有限公司,河南郑州450008 [2]河南安罗高速公路有限公司,河南郑州450003

出　　处：《河南科技》2022年第3期95-98,共4页Henan Science and Technology

摘　　要：根据竖向荷载作用下的桩-土相互作用原理,并考虑土体应力应变的非线性特征,建立了桩基沉降简化模型。笔者以某高速公路为工程实例,探讨了预制管桩桩长和回弹率在砂层地基中对基桩沉降的影响。研究结果表明:当桩径不变时,基桩沉降随桩顶竖向荷载的增加呈现非线性增大的趋势,随桩长的增大呈非线性减小趋势;增大桩径一定程度上能够减小桩基竖向受荷沉降,但是对于桩径800 mm的基桩,桩长增大到12 m时,桩长已经不再是控制桩径沉降的关键参数;基桩试验样本的回弹率在小范围内波动,对基桩沉降基本无影响,以期为基桩工程的设计提供参考。According to the principle of pile-soil interaction under vertical load, and considering the nonlinear characteristics of soil stress and strain, a simplified pile settlement model is established. The author takes the foundation piles of the viaduct from Shangcai to Luoshan on the Anyang-Luoshan Expressway as an engineering example to discuss the influence of the length and resilience of precast pipe piles on the settlement of foundation piles in sand foundations. The research results show that when the pile diameter is constant, the settlement of the foundation pile decreases with the increase of the pile length in a non-linear trend, and with the increase of the vertical load on the top of the pile, it shows a non-linear increase trend. Increasing the pile diameter can reduce the vertical load settlement of the pile foundation to a certain extent, but when the pile length increases to about 12 m with pile diameter of 800 mm, the pile length is no longer a key parameter to control the pile diameter settlement. The rebound rate of the foundation pile test samples fluctuates in a small range, and has basically no effect on the settlement of the foundation pile, which is expected to provide a reference for the design of foundation pile engineering.

关 键 词：预制管桩 沉降 桩基 回弹率 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]