斜坡堆填土引起桩侧负摩阻力特性分析  

Characteristic Analysis of Negative Friction Resistance of Pile Shaft Caused by Slope Fill

作　　者：代先尧 王国斌 叶钟文 鲁杰 DAI Xianyao;WANG Guobin;YE Zhongwen;LU Jie(Hubei Provincial Communications and Design Institute Co.Ltd.,Wuhan 430051;CCCC Central South Engineering Bureau Co.Ltd.,Changsha 410000)

机构地区：[1]湖北省交通规划设计院股份有限公司,武汉430051 [2]中交中南工程局有限公司,长沙410000

出　　处：《土工基础》2025年第1期93-96,共4页Soil Engineering and Foundation

基　　金：湖北省交通运输厅科技项目(2018-422-1-18)。

摘　　要：为了研究斜坡堆填土地区桩基受力变形特征,采用数值模拟方法研究了填土界面坡度对桩侧负摩阻力、中性点深度、填土表面沉降以及桩体水平位移的影响。研究表明,随着填土界面坡度增大,负摩阻力减小、中性点深度基本不变、桩前填土表面沉降呈减小的趋势,桩后填土表面沉降呈增大的趋势;桩基设计时需考虑填土界面坡度对桩基轴力和水平变形的影响。研发了一种侧根复合受荷桩,倒锥形塑料膜可以有效减小甚至消除负摩阻力的影响,设置的侧根可以减少欠固结土的下沉,同时也可提高桩基抵抗水平变形的能力。研究成果可为相似工程设计、施工提供理论支撑和技术参考。To study the mechanical deformation characteristics of pile foundations in slope filled areas,a numerical simulation method was used to study the effects of fill interface slope on negative frictional resistance,neutral point depth,fill surface set-tlement,and horizontal displacement of piles.The results show that as the slope of the fill interface increases,the negative fric-tional resistance decreases,the neutral point depth remains basically unchanged,and the surface settlement of the fill before the pile decreases,while the surface settlement of the fill after the pile increases;Therefore,when designing pile foundations,it is necessary to consider the impact of the slope of the fill interface on the axial force and horizontal deformation of the pile founda-tion.A composite loaded pile with side roots has been developed.The inverted conical plastic film can effectively reduce or even eliminate the impact of negative frictional resistance.The installation of side roots can reduce the settlement of underconsolidat-ed soil,while also improving the ability of the pile foundation to resist horizontal deformation.The research results can provide theoretical support and technical reference for similar engineering design and construction.

关 键 词：土木建筑工程 斜坡堆填土 负摩阻力 水平变形 承载力 

分 类 号：TU473[建筑科学—结构工程]