基于球孔扩张理论的静压桩桩端阻力解析解  

Analytical solution of tip resistance for jacked pile based on spherical cavity expansion theory

作　　者：李雨浓[1,2] 曹锦楼 王立伟[1,2] 曹海莹 LI Yu-nong;CAO Jin-lou;WANG Li-wei;CAO Hai-ying(Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province,Yanshan University,Qinhuangdao 066004,China;School of Civil Engineering and Mechanics,Yanshan University,Qinhuangdao 066004,China)

机构地区：[1]燕山大学河北省土木工程绿色建造与智能运维重点实验室,河北秦皇岛066004 [2]燕山大学建筑工程与力学学院,河北秦皇岛066004

出　　处：《沈阳工业大学学报》2022年第2期221-226,共6页Journal of Shenyang University of Technology

基　　金：国家自然科学基金青年科学基金项目(51408527);河北省自然科学基金青年基金项目(E2015203195).

摘　　要：为了研究静压桩在饱和黏土中的沉桩端阻力,利用球孔扩张理论推导出极限桩端阻力的计算公式,并通过室内模型试验测量出不同深度桩端阻力的数值.结果表明,静压沉桩过程中桩端阻力随着压桩深度先是呈快速增长,之后渐渐变缓且趋于平稳.极限桩端阻力的理论值是随着桩体半径呈二次曲线增长的,随着土体粘聚力的增大而增大,也随着内摩擦角的增大而变大.经对比分析可知,对于长桩采用本文理论方法所求得的极限端阻力计算值更贴近沉桩终止时的实测值.In order to study the tip resistance of jacked pile in saturated soil,the calculation formula of ultimate pile tip resistance was derived by the spherical cavity expansion theory,and the numerical values of pile tip resistance at different depths were measured by model test.The results show that the pile tip resistance increases rapidly with the pile depth in the sinking process of jacked pile,and then the resistance growth becomes slower and tends to be stable.The theoretical calculation of pile tip ultimate resistance increases with the pile radius in the form of quadratic curve,and becomes larger when the cohesion and internal friction angle of soil increases.Through comparative analysis,it can be seen that the calculated value of pile tip ultimate resistance for long pile using the theoretical method in this paper is closer to the measured value in the end of pile sinking.

关 键 词：静压桩 沉桩阻力 球孔扩张理论 拓展莱特邓肯屈服准则 极限扩孔压力 桩端阻力 桩端承载力 模型试验 

分 类 号：TU473[建筑科学—结构工程]