劲性复合管桩支护结构水平受力变形特性研究  

Research on the Horizontal Stress and Deformation Characteristics of the Strength Composite Pipe Pile Support Structure

作　　者：余少华 郑小晴 夏良利 方焘[3] 罗如平 付丽 朱晓杰 Yu Shaohua;Zheng Xiaoqing;Xia Liangli;Fang Tao;Luo Ruping;Fu Li;Zhu Xiaojie(Jiangxi Communications Design and Research Institute Co.,Ltd.,Nanchang 330052,China;Jianhua Building Materials(Jiangxi)Co.,Ltd.,Nanchang 330225,China;Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,China;JiangxiWater Resources Institute,Nanchang 330013,China)

机构地区：[1]江西省交通设计研究院有限责任公司,江西南昌330052 [2]建华建材(江西)有限公司,江西南昌330225 [3]华东交通大学江西省岩土工程基础设施安全与重点实验室,江西南昌330013 [4]江西水利职业学院,江西南昌330013

出　　处：《华东交通大学学报》2025年第1期16-25,共10页Journal of East China Jiaotong University

基　　金：江西省交通运输厅科技项目(2022H0023)。

摘　　要：为了研究劲性复合管桩(SCP桩)与传统管桩在基坑支护中的性能差异,运用室内模型试验与有限元模拟的方法,研究SCP桩支护结构在开挖过程中的受力变形特性,并揭示水泥土参数对其支护效果的影响规律。研究结果表明:在实验条件下,水泥土包裹管桩的支护效果提升显著;相较于传统管桩,SCP桩桩顶水平位移下降范围为24.7%~58.3%,外侧土体沉降减小幅度为11.4%~44.9%,桩身弯矩减小幅度为10.9%~24.6%。水泥土可以有效地提高管桩作为支护结构的支护能力,并且提高水泥土的弹性模量以及增加其厚度均能显著增强劲性复合桩的支护效果,不过,相比之下,增加厚度对支护效果的提升作用更为突出。In order to study the performance differences between the strength composite pipe pile(SCP pile)and traditional pipe piles in foundation pit support,using indoor model tests and finite element simulation methods,the stress and deformation characteristics of SCP pile support structure during excavation are studied,and the in-fluence of cement soil parameters on its support effect is revealed.The research results indicate that under experi-mental conditions,the support effect of cement soil wrapped pipe piles is significantly improved;Compared to traditional pipe piles,the horizontal displacement at the top of SCP piles decreases by 24.7%to 58.3%,the settle-ment of the outer soil decreases by 11.4%to 44.9%,and the bending moment of the pile body decreases by 10.9%to 24.6%.Cement soil can effectively improve the support capacity of pipe piles as supporting structures,and increasing the elastic modulus of cement soil and increasing its thickness can significantly enhance the sup-porting effect of reinforced composite piles.However,in contrast,increasing the thickness has a more prominent effect on the supporting effect.

关 键 词：劲性复合管桩 支护结构 室内模型试验 支护结构与土体位移 桩身弯矩 

分 类 号：TU473.1[建筑科学—结构工程] U25[建筑科学—土工工程]