横坡段桩柱式桥梁双桩基础结构的力学行为研究  

Mechanics behavior of double-pile foundation structure for pile-column bridge in cross slopes

作　　者：杨果林[1] 邓志宏 罗桂军 段君义 肖洪波 庞圣涛 YANG Guolin;DENG Zhihong;LUO Guijun;DUAN Junyi;XIAO Hongbo;PANG Shengtao(School of Civil Engineering,Central South University,Changsha 410075,China;Civil Engineering Co.,Ltd.,China Construction Fifth Engineering Bureau,Changsha 410004,China;School of Infrastructure Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中建五局土木工程有限公司,湖南长沙410004 [3]南昌大学工程建设学院,江西南昌330031

出　　处：《铁道科学与工程学报》2023年第3期920-930,共11页Journal of Railway Science and Engineering

基　　金：国家重点研发计划项目(2019YFC1509800);国家自然科学基金资助项目(52208348,51778641);江西省自然科学基金资助项目(20224BAB214064);中建五局技术开发项目(020116D0003009);中铁九局技术开发项目(XKGT-07-GGB2022-037)。

摘　　要：桩柱式桥梁双桩基础结构在公路/铁路横坡段桥梁工程中应用广泛,其兼具承重桩和抗滑桩的特点,并形成了复杂的桩土及桩梁相互作用体系。为研究复杂受荷条件下桩柱式桥梁双桩基础结构的力学行为,提出基于向量式有限元的计算方法,并利用Python语言编写计算程序。通过与其他数值计算方法的计算结果进行对比,验证该方法的可靠性。最后,结合工程实例,研究桩径、横系梁高度、边坡坡度和地基抗力系数对横坡段桩柱式桥梁双桩基础结构的力学行为的影响。研究结果表明:前、后桩桩身位移随桩径和地基抗力系数的增大而明显减小,随边坡坡度的增大而增大;由于桩周土对前、后桩的约束程度不同以及横系梁的内力调节作用,导致前、后桩桩身内力随边坡坡度的改变呈现出不同的变化规律;横系梁高度对前、后桩桩身内力及变形的影响较小,但横系梁的存在能调整前、后桩的受力状况,改善前、后桩荷载分担比例,使基桩性能充分发挥,在实际工程中应合理利用桩梁相互作用调整并优化双桩基础结构的力学行为。The pile-column bridge double-pile foundation structure is widely used in bridge engineering of highway/railway cross-slope section,which has the characteristics of both load-bearing piles and anti-slip piles,and forms a complex pile-soil and pile-beam interaction system.In order to study the mechanical behaviors of pile-column bridge double-pile foundation structure under complex loading conditions,a calculation method based on vector form intrinsic finite element was proposed.The calculation program was prepared by using Python programming language.The reliability of the proposed calculation method was verified by comparing the calculation results with other numerical calculation methods.Finally,the effects of pile diameter,cross tie beam height,slope angle and foundation resistance coefficient on the mechanics behaviors of pile-column bridge double pile foundation structure in cross slopes were studied with respect to a practical case.The results show that the displacement of front pile and back pile decreases significantly with the increase of pile diameter and foundation resistance coefficient,while it increases with the increase of slope angle.Due to the different constraint of the soil around the piles on front and back piles and the internal force regulation effect of the cross tie beam,the internal forces of the front and back piles show different variation laws with the change of the slope angle.Cross tie beam height has less influence on the internal force and deformation of the front and back piles.However,cross tie beam can adjust the stress conditions of the front and back piles and improve the load sharing ratio of the piles.The performance of the piles can be fully utilized.The pile-beam interaction should be used reasonably to adjust and optimize the mechanical behaviors of double-pile foundation structure in practical engineering.

关 键 词：横坡段 桥梁工程 双桩基础 向量式有限元 力学行为 

分 类 号：U443.15[建筑科学—桥梁与隧道工程]