摘要
广州地铁12号线上跨4号线,上跨期间,12号线由2.95%上坡变坡为2.52%下坡,最小竖向净距为1.46m,风险较大,必须快速穿越,以保证盾构安全上跨运营隧道。通过对既有结构进行鉴定,采取布设监测点、拉紧管片、控制盾构掘进等措施,提出适用于广州地区强风化混合花岗岩的盾构掘进参数,总结出盾构大坡度近距离上跨运营隧道控制技术在于控出渣、低转速、气压辅助,盾构姿态控制良好,虽导致地表隆起与运营隧道沉降,但变形均控制在安全范围内。
Guangzhou Subway line 12 overpasses line 4,line 12 changes from 2.95%upslope to 2.52%downslope,and the minimum vertical net distance is only 1.46m,so it must overcross quickly due to the high risk,so as to ensure the safety of overcrossing the operating tunnels.The existing structure is identified,monitoring point is set,segment is tightened,shield tunnelling is controlled.A set of shield tunnelling parameters suitable for strong weathering mixed granite in Guangzhou area is put forwarded,and the key construction control technology of shield tunnel with large slope is summarized as ling slag control,low speed and pneumatic assistance.After adopting the above key technologies,the attitude control of shield tunnelling machine is good.The overcrossing construction will lead to the uplift of surface and the settlement of the operating tunnels,but the deformation is controlled within the limit value.
作者
李学创
张斌
罗求林
吴跃鹏
LI Xuechuang;ZHANG Bin;LUO Qiulin;WU Yuepeng(CCCC Rail Transit Branch,Beijing 100120,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou,Guangdong 510640,China;CCCC(Guangzhou)Construction Co.,Ltd.,Guangzhou,Guangdong 511466,China)
出处
《施工技术（中英文）》
CAS
2023年第17期50-54,共5页
Construction Technology
关键词
隧道
盾构
管片
变形
参数控制
监测
tunnels
shields
segments
deformation
parameter control
monitoring
作者简介
李学创,高级工程师,E⁃mail:369878409@qq.com。
