隔离桩间距对基坑开挖引起地铁隧道的位移影响分析  

Effects of pile spacing on the displacement of subway tunnel during excavation

作　　者：曾晓鑫 丁文湘 彭玲[1] 徐长节[1,3] 

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]浙江省工业设计研究院,杭州310052 [3]浙江大学滨海和城市岩土工程研究中心,杭州310058

出　　处：《中国科技论文》2018年第1期17-22,共6页China Sciencepaper

基　　金：国家重点基础研究发展计划(973计划)资助项目(2015CB057801);国家自然科学基金资助项目(51278449;51238009;51338009);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：基于杭州市某房建地下室深基坑工程采用隔离桩保护邻近既有地铁隧道的工程案例,采用ABAQUS有限元软件进行数值模拟,建立三维模型对不同隔离桩间距下隧道的位移进行分析。结果表明:基坑开挖最终引起隧道下沉约3.1mm,隧道向靠近基坑方向水平位移约1.7mm,数值模拟计算结果与现场实测数据的相关规律吻合;隔离桩间距越小,基坑开挖引起邻近既有地铁隧道位移越小。The unloading effect of surrounding soil will cause deformation of adjacent metro tunnel when deep foundation pit was excavated,which will affect its performance during service.Therefore,the effects of isolated pile spacing on displacement of metro tunnel need to be well studied.Based on a basement deep foundation pit project next to the existing metro tunnel in Hangzhou,which uses isolated pile as the protection,the numerical simulation was performed by using ABAQUS finite element software through a 3D model.The displacement of tunnel under different spacing of isolated piles was analyzed.The results showed that the final settlement of tunnel due to excavation was approximately 3.1 mm and horizontal displacement of tunnel was about 1.7 mm.Meanwhile,the numerical simulation results fit with the field measured data.In addition,the smaller the isolated pile spacing,the smaller was the displacement of the existing subway tunnel caused by the excavation.

关 键 词：深基坑 隔离桩 既有地铁隧道 数值分析 Drucker-Prager硬化模型 

分 类 号：TU454[建筑科学—岩土工程]