盾构隧道近距离下穿机场高速桥梁加固措施优化研究  

Study on Optimization of Reinforcement Measures for Shield Tunnel Undercrossing Airport High-speed Bridge in Close Distance

作　　者：聂华 王先明[2] 黄钞 彭小雨 陈兵[2] NIE Hua;WANG Xianming;HUANG Chao;PENG Xiaoyu;CHEN Bing(Chengdu Hydropower Construction Engineering Co.,Ltd.of Sinohydro Bureau 7 Co.,Ltd.,Chengdu 611130,China;Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]中国水利水电第七工程局成都水电建设工程有限公司,成都611130 [2]西南交通大学交通隧道工程教育部重点实验室,成都610031

出　　处：《路基工程》2022年第6期201-207,共7页Subgrade Engineering

摘　　要：以成都轨道交通19号线二期工程龙桥路站—双流机场站区间盾构隧道近距离下穿机场高速桥梁工程为依托,通过数值模拟结合现场实测,对典型隧道开挖步下的地层沉降和既有机场高速桥梁变形进行分析,对比研究不同加固措施下地层及机场高速桥梁的变形响应。研究结果表明:随着盾构隧道的不断推进,桥基向隧道开挖面偏移,变形量不断增加;3种隔离桩防护措施均能对盾构隧道掘进引起的地层扰动起到缓解作用,其中双排钢花桩和双排钻孔旋喷桩能有效控制桥基变形。Based on the shield tunnel of Longqiao Road Station—Shuangliu Airport Station of Chengdu Rail Transit Line 19 Phase II Project undercrossing airport high-speed bridge in close distance,the stratum settlement under typical tunnel excavation and the deformation of existing airport high-speed bridge are analyzed by numerical simulation results combined with field monitoring data.The deformation response of stratum and airport high-speed bridge under different reinforcement measures is studied.The research results show that with the continuous advancement of shield tunnel,the bridge foundation towards the tunnel excavation surface driven by stratum migration,and the deformation is also increasing.The three kinds of isolation pile protection measures can alleviate the stratum disturbance caused by shield tunneling.Among them,the double-row steel pile and the double-row bored rotary jet pile can effectively control the deformation of the foundation.

关 键 词：盾构隧道 加固措施 数值模拟 机场高速桥梁 近距离下穿施工 

分 类 号：TU375.4[建筑科学—结构工程]