基于桩-土接触面的双排桩边坡支护结构受力性能研究  

Mechanical Performance of Double-Row Pile Supporting Structure Using on Pile-Soil Interface Elements

作　　者：刘成军 王一兆 陈俊生[2,3,4] 张思远 郭康仕 陈仕洪 郭子健 张荣辉 LIU Chengjun;WANG Yizhao;CHEN Junsheng;ZHANG Siyuan;GUO Kangshi;CHEN Shihong;GUO Zijian;ZHANG Ronghui(Guangzhou Metro Design and Research Institute Co.Ltd.,Guangzhou 510010;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640;South China Institute of Geotechnical Engineering,Guangzhou 510640)

机构地区：[1]广州地铁设计研究院股份有限公司,广州510010 [2]华南理工大学土木与交通学院,广州510640 [3]亚热带建筑科学国家重点实验室,广州510640 [4]华南岩土工程研究院,广州510640

出　　处：《土工基础》2023年第1期68-73,共6页Soil Engineering and Foundation

摘　　要：双排桩支护结构以其抗侧移刚度大、场地适用面广以及施工便捷等优势,近年来被广泛应用于边坡支护。针对永久性边坡的双排桩支护结构,借助岩土有限元计算软件Midas GTS NX,以接触面的形式考虑桩-土相互作用,研究永久性双排桩支护结构的位移及内力情况,确定合理的桩排距以及后排桩桩间距,对比工程监测数据,对双排桩支护结构的安全性、可靠性进行验证,为相关工程提供参考。结果表明,通过建立桩-土接触面,可更符合实际地模拟双排桩的变形形态;桩排距取为桩径的3.5倍左右可较好地发挥双排桩的力学性能及空间效应;后排桩桩间距取为前排桩桩间距的2倍左右可在满足工程安全要求的前提下节约造价;对比数值计算结果与现场监测结果,验证了双排桩数值仿真中建立桩-土接触面的必要性及该双排桩支护方案的合理性。The double-row pile system has been extensively used in the excavation support due to its advantages such as large lateral resistance stiffness,strong site applicability and convenience.This paper considers the interaction between piles and soil in the form of contact element to study the displacement and internal force of the double-row pile using MIDAS GTS NX.Combined with the field monitoring information,this paper verifies the safety and reliability of the double-row pile supporting structure,which provides reference for related projects.The result shows that by establishing the pile-soil contact surface,the deformation of the double row piles can be simulated more practically.About 3.5 times of the pile diameter is a reasonable pile row spacing,which can make full use of the mechanical properties and space effect of double row piles.About 2 times of the distance between piles in the front row is a reasonable distance between piles in the back row,which can save the project cost in the case of ensuring safety.Making a comparison between the numerical calculation consequences and the monitoring information,this paper verifies the necessity of establishing the pile-soil contact surface elements in the numerical simulation of the double row piles and the rationality of the support scheme of double row piles.

关 键 词：桩土作用 接触面 双排桩 受力性能 

分 类 号：TU473[建筑科学—结构工程]