复合地层双模盾构风险分析与针对性设计  

Analysis of Risks and Targeted Design of Dual-mode Shield in Composited Strata

作　　者：黄钟晖 陈凡[2,3] 孟庆军 刘川昆 程帆 王士民 姚超凡[2,3] HUANG Zhonghui;CHEN Fan;MENG Qingjun;LIU Chuankun;CHENG Fan;WANG Shimin;YAO Chaofan(Nanning Rail Transit Group Co.,Ltd.,Nanning 530029,Guangxi,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,Sichuan,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)

机构地区：[1]南宁轨道交通集团有限责任公司,广西南宁530029 [2]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《隧道建设（中英文）》2020年第S02期297-305,共9页Tunnel Construction

摘　　要：为解决富水圆砾—泥岩复合地层采用双模盾构的适应性设计问题,依托南宁市轨道交通5号线五一立交站—新秀公园站隧道工程,针对穿越邕江、下穿浅基础建筑物、圆砾—泥岩复合地层中地表沉降和刀盘固结泥饼等施工风险,提出泥水/土压双模盾构结构和功能系统的针对性设计。在结构设计方面,双模盾构增设气垫仓稳定泥水压力,并配合排浆口优化设计实现了对地层沉降的稳定控制;加设中心面板和扭腿冲刷及“P0泵小循环”系统降低泥饼形成概率;优化的螺旋输送机设计减小喷涌压力,与邻近线路相比,过江段掘进速率提高近1倍。在功能性系统方面,实现泥水和土压2种排渣体系的快速转换;推进系统总推力达39910 kN,满足不同掘进状态的需要;通过注浆系统与合理掘进参数实现对地表沉降的严格控制。Adaptive design of dual-mode shield in water-rich gravel-mudstone composited strata is of great significance.As a result,the targeted designs of structure and functional system of slurry/earth pressure dual-mode shield used in Wuyi Interchange station-Xinxiu Park station on Nanning Rail Transit Line No.5 are put forward according to the construction risks such as crossing through Yongjiang River,crossing underneath buildings with shollow foundations,surface settlement induced by shield boring in gravel-mudstone composited strata,and muck cake on cutterhead.As for structural design,the air cushion chamber is used to stabilize slurry pressure,and the slurry discharge port is optimized so as to realize the stable control of surface settlement.The brush and P0 pump circulation systems are set on central panel and bracket to effectively reduce the mud cake phenomenon.The design of screw conveyor is optimized to reduce the gushing pressure,and compared with the adjacent lines,the boring speed of the river-crossing section is increased by nearly one time.As for functional system,mucking system conversion between slurry and earth pressure dual-mode is realized,the total thrust of the propulsion system reaches 39910 kN,which can meet relevant requirements under different working conditions,the surface settlement is strictly controlled according to grouting system and rational tunneling parameters control.

关 键 词：轨道交通 隧道 双模盾构 复合地层 风险分析 针对性设计 越江隧道 刀盘刀具 

分 类 号：U45[建筑科学—桥梁与隧道工程]