拱形双排隔离桩位置对既有隧道的影响分析  

Analysis of influence of position of arch double row isolated pile on existing tunnel

作　　者：徐长节[1,2] 曾晓鑫 戚晓锴 赵秀绍[1] XU Changjie;ZENG Xiaoxin;QI Xiaokai;ZHAO Xiushao(Jiangxi Key Laboratory of Infrastructure Safety Control in Geotechnical Engineering,East China Jiaotong University,Nanchang 330013,China;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University,Hangzhou 310058,China;Hangzhou Chengdong New City Construction Investment Co.,Ltd,Hangzhou 310021,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,江西南昌330013 [2]浙江大学滨海和城市岩土工程研究中心,浙江杭州310058 [3]杭州市城东新城建设投资有限公司,浙江杭州310021

出　　处：《铁道科学与工程学报》2018年第6期1501-1508,共8页Journal of Railway Science and Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2015CB057801);国家自然科学基金资助项目(51278449;51238009;51668018);江西省岩土工程基础设施安全与控制重点实验室资助项目(20161BCD40002)

摘　　要：以杭州市某房建地下室基坑工程为背景,利用ABAQUS有限元软件建立三维模型,研究不同隔离桩位置下隧道的位移和受力以及拱形双排隔离桩受力后的位移。研究结果表明:拱形双排隔离桩设在距基坑约10 m处,并将弧形排桩设在隧道一侧,隧道衬砌位移最小;拱形双排隔离桩设在距基坑12 m处,隔离桩的位移和应力值最小;隧道衬砌各个度数下的应力值均呈现先减小后增大的趋势;弧形排桩桩尾位移小于直线形排桩,弧形排桩桩头位移大于直线形排桩;隔离桩靠近基坑时,拱形排桩位移比直线形排桩大,隔离桩靠近隧道时,反之。Based on an excavation of building basement in Hangzhou, a three-dimensional model was established by using ABAQUS finite element software. The bored pile of foundation pit supporting structure was transformed into underground continuous wall, and linear Drucker-Prager hardening constitutive model was used to analyze. The displacement of the tunnel and arch double row isolated pile under different positions of isolation piles was studied. The results show that, when the double arch isolation pile located at about 10 m of foundation pit and the curved row pile in tunnel, the tunnel lining displacement reaches the minimum. The arch located at 12 m of foundation pit, the displacement and stress value of isolation piles is minimum. The stress values under different degrees of tunnel lining decrease first and then increase. Pile tail arc displacement is smaller than the straight pile, while curved row pile head displacement is greater than the straight pile. When the isolation pile is near the pit, arched row pile displacement is larger than the straight pile. The contrary is the case when the isolation pile is near the tunnel.

关 键 词：隔离桩 基坑开挖 既有隧道 数值分析 Drucker-Prager硬化模型 

分 类 号：TU454[建筑科学—岩土工程]