锚杆静压桩贯入特性影响因素研究  

Study on the influence factors of penetration characteristics of static pressure anchor pile

作　　者：裴东林 高磊[1] 高明军[1] 章晓进 PEI Donglin;GAO Lei;GAO Mingjun;ZHANG Xiaojin(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing 210024,China;Jiangsu Jianhua Construction Co.,Ltd.,Nanjing 210009,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210024 [2]江苏建华建设有限公司,江苏南京210009

出　　处：《甘肃科学学报》2024年第6期19-24,共6页Journal of Gansu Sciences

基　　金：国家自然科学基金(42377184);国家重大科研仪器研制(52027812)。

摘　　要：锚杆静压桩是地下工程领域应用较多的桩型之一。为了研究锚杆静压桩贯入特性影响因素,基于有限元法,建立了锚杆静压桩贯入土体三维有限元模型,利用耦合欧拉-拉格朗日(CEL)方法,考虑了桩土摩擦系数﹑土体黏聚力﹑土体弹性模量对锚杆静压桩压桩力的影响,为对比不同因素的影响程度,开展因素敏感性分析。结果表明,压桩力随桩土摩擦系数增大而增大,贯入深度会影响压桩力增加幅度,摩擦系数为0.3~0.4时与0.2~0.3时相比,压桩力增加幅度较小;压桩力随土体黏聚力增大而增大,压桩力增长幅度在20~30 kPa时大于30~40 kPa时;土体弹性模量对压桩力的影响与桩土摩擦系数规律相似,土体弹性模量为15~25 MPa时与5~15 MPa时相比,压桩力增加幅度较小,桩土摩擦系数对最大沉桩力的影响最大,土体弹性模量次之,土体黏聚力最小。Static pressure anchor pile is one of the most commonly used pile types in the field of underground engineering.In order to study the influence factors of penetration characteristics of static pressure anchor pile,the three-dimensional finite element model of static pressure anchor pile is established.The coupled Euler-Lagrangian(CEL) method is used,the pile-soil friction coefficient,soil cohesion,and soil elastic modulus on the jacking resistance of static pressure anchor pile are considered.In order to compare the influence of different factors,the factor sensitivity analysis is carried out.The result shows that the jacking resistance increases with the increasing of pile-soil friction coefficient,the penetration depth will affect the increasing of the jacking resistance.The jacking resistance for pile-soil friction coefficient with 0.3~0.4 increases slightly than that of the pile-soil friction coefficient with 0.2~0.3.The jacking resistance increases with the increasing of soil cohesion.The increasing of the jacking resistance under 20~30 kPa is greater than that of under 30~40 kPa.The influence of soil elastic modulus on the jacking resistance is similar to the law of pile-soil friction coefficient.The jacking resistance for soil elastic modulus with 15~25 MPa increases slightly than that of with 5~15 MPa.The pile-soil friction coefficient has the greatest influence on the maximum jacking resistance,the elastic modulus of the soil is the middle,the soil cohesion is the smallest.

关 键 词：锚杆静压桩 耦合欧拉-拉格朗日法 压桩力 影响因素 敏感性分析 

分 类 号：TU473.1[建筑科学—结构工程]