基坑开挖下倾斜长短组合桩的受力变形特性  

Mechanical and deformation characteristics of inclined long short composite pile under foundation pit excavation

作　　者：王际凯 石钰锋[1] 刘伟煌 詹刚毅[2] 蒋亚龙 徐长节[1,3] WANG Jikai;SHI Yufeng;LIU Weihuang;ZHAN Gangyi;JIANG Yalong;XU Changjie(Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering, East China Jiaotong University, Nanchang 330013, P. R. China;China Railway Shanghai Design Institute Group Co., Ltd., Shanghai 200070, P. R. China;Research Center of Coastal and Urban Geotechnical Engineering Zhejiang Unirersity, Hangzhou 310058, P. R. China)

机构地区：[1]华东交通大学江西省岩土工程基础设施安全与控制重点实验室,南昌330013 [2]中铁上海设计院集团有限公司,上海200070 [3]浙江大学滨海和城市岩土工程研究中心,杭州310058

出　　处：《土木与环境工程学报（中英文）》2022年第4期35-44,共10页Journal of Civil and Environmental Engineering

基　　金：江西省自然科学基金(20192BAB206043);国家地区科学基金(51768020)。

摘　　要：倾斜长短组合桩兼具变形控制能力良好和造价低的优点。目前,对倾斜长短组合桩的研究较少,尚缺乏对其工作机理的认识。利用模型试验结合数值模拟的方法,研究开挖过程中倾斜长短桩在不同倾角和桩长组合下的变形受力特性,继而探讨其工作机理。结果表明:对于倾斜长短组合桩而言,其支护效果与倾角成正比,与排桩的桩长成反比,且倾角的影响最大,桩长次之;在总桩长一定且短桩满足一定嵌入深度时,倾角存在一个临界值,当倾角小于临界值时,最佳桩长分配受倾角大小的影响,而当倾角大于临界值时,斜桩越长,支护效果越好。The inclined long short composite pile has the advantages of good deformation control ability and low cost.Currently,there are limited studies on this aspect and understanding of its working mechanism is still lacking.In view of this,through the model test and numerical method,the deformation and mechanical characteristics of long and short inclined piles under different inclination and pile length combinations during excavation are studied,and then the working mechanism is discussed.The results show that:For inclined long short composite piles,the supporting effect is directly proportional to the inclination angle and inversely proportional to the pile length of row piles,and the influence of inclination angle is the greatest,followed by the pile length;When the total pile length is fixed and the short pile meets a certain embedded depth,the inclination angle has a critical value.When the inclination angle is less than the critical value,the optimal pile length distribution is affected by the inclination angle.When the inclination angle is greater than the critical value,the longer the inclined pile,the better the supporting effect.

关 键 词：基坑开挖 倾斜长短组合桩 土体与支护结构位移 桩身弯矩 

分 类 号：TU473.1[建筑科学—结构工程]