深厚软土地段桥梁地基系数比例系数试验研究  

Experimental study on proportional coefficient of bridge foundation coefficient in deep soft soil section

作　　者：宋旭明[1] 王天良 唐冕[1] 潘鹏宇 SONG Xuming;WANG Tianliang;TANG Mian;PAN Pengyu(School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《武汉大学学报（工学版）》2023年第9期1081-1087,共7页Engineering Journal of Wuhan University

基　　金：国家自然科学基金面上项目(编号:52078486)。

摘　　要：桥梁桩基地基系数的比例系数m值对桥梁纵横向刚度影响较大,选取合理的m值是高速铁路桥梁设计中的重要问题。规范中给出的m值取值范围较大,为了确定软土地段m值的合理取值,通过水平静载试验,结合规范改进群桩m值的计算方法,获得单桩和群桩水平荷载与桩顶位移之间的关系曲线,进而计算单桩和群桩的m值,并对单桩和群桩m值之间的差异进行了分析。结果表明:m值随地面处水平位移增加呈幂函数衰减趋势;由于群桩效应使得群桩、单桩m值差异较大;试验工点的群桩m值建议取2600 kN/m4,该取值可为土层相似地段地基系数比例系数的取值提供借鉴,计算方法也可为类似工程m值的快速估算提供参考。The proportional coefficient(m value)of bridge pile foundation coefficient has a great influence on the longitudinal and transverse stiffness of the bridge.Selecting a reasonable m value is an important problem in the design of high-speed railway bridges.The value range of m given in the specification is large.In order to determine the reasonable value of m value in soft soil section,this paper improves the calculation method of m value of pile group through horizontal static load test and code,and the relationship curves between horizontal load and pile top displacement of single pile and pile group are obtained.The m values of single pile and pile group are calculated,and the differences of m values of single pile and pile group are analyzed.The calculation results show that the value of m decreases as a power function with the increase of horizontal displacement at the ground surface.Due to the effect of pile group,the m values of pile group and single pile are quite different.The m value of pile group at the test site is recommended to be 2600 kN/m4,which can provide a reference for the value of foundation coefficient proportional coefficient in similar sections of soil layer.The calculation method can also provide a reference for the rapid estimation of m value of similar projects.

关 键 词：深厚软土 高铁桥梁 地基系数比例系数 试验研究 

分 类 号：TU473[建筑科学—结构工程]