软土地层加固对盾构姿态调控及地层变形的影响研究  

A Study on Impact of Soft Soil Stratum Reinforcement on the Attitude Regulation of Shield Machine and Stratum Deformation

作　　者：苏栋[1,2,3] 谭毅俊 沈翔 黄昌富 陈湘生[1,2,3] SU Dong;TAN Yijun;SHEN Xiang;HUANG Changfu;CHEN Xiangsheng(School of Civil and Traffic Engineering,Shenzhen University,Shenzhen 518060;Key Laboratory of Coastal Urban Resilient Infrastructures(Shenzhen University),Ministry of Education,Shenzhen 518060;Shenzhen Key Laboratory of Green,Efficient and Intelligent Construction of Underground Metro Station,Shenzhen 518060;China Railway 15th Bureau Group Co.,Ltd.,Shanghai 200070)

机构地区：[1]深圳大学土木与交通工程学院,深圳518060 [2]滨海城市韧性基础设施教育部重点实验室(深圳大学),深圳518060 [3]深圳市地铁地下车站绿色高效智能建造重点实验室,深圳518060 [4]中铁十五局集团有限公司,上海200070

出　　处：《现代隧道技术》2023年第2期138-148,167,共12页Modern Tunnelling Technology

基　　金：国家自然科学基金(52090081,51938008);中铁十五局科研项目(CR15CG-ZH-HQMZSD-2021-00001(KJ))。

摘　　要：依托珠海市横琴杧洲软土地层大直径盾构隧道工程,建立未加固和预加固地层大直径盾构掘进数值仿真分析模型,通过改变推进系统荷载分布来施加偏转力矩,研究偏转力矩与盾构机俯仰角之间的关系以及盾构机姿态变化对地层变形的影响。结果表明,造成该工程盾构机初始“低头”状态的重力偏心矩为261 MN·m,地层预加固条件下,使姿态调至水平所需的偏转力矩约为21 MN·m,较未加固情况(111 MN·m)小81.1%;地层预加固条件下正偏转力矩每增加100 MN·m,盾构机俯仰角增加约0.015°,较未加固情况(0.095°)小84.2%;相同负偏转力矩条件下,预加固后俯仰角的绝对值较未加固情况小85.0%以上;地层预加固使地表最大隆起量和最大沉降量均减小95.0%以上。Based on the large-diameter shield tunnel project in soft soil strata in Hengqin District of Zhuhai City,this paper establishes a numerical simulation and analysis model for large-diameter shield tunnelling in unrein⁃forced and pre-reinforced strata,and investigates the relationship between the deflection moment and pitch angle of the shield machine as well as the impact of the changes in the machine′s attitude on the deformation of the strata by changing the load distribution of the thrust system to apply the deflection moment.The results show that the gravita⁃tional eccentric moment that causes the initial"bow"of the shield machine is 261 MN·m,and the deflection mo⁃ment required to level the attitude under the condition of pre-reinforced strata is about 21 MN·m,which is 81.1%smaller than the condition of un-reinforced strata(111 MN·m).Under the condition of pre-reinforced strata,for ev⁃ery 100 MN·m increase in the positive deflection moment,the pitch angle of the shield machine will increase by about 0.015°,which is 84.2%smaller than the condition of un-reinforcement(0.095°).Also,under the condition of identical negative deflection moment,the absolute value of pitch angle after pre-reinforcement is more than 85.0%smaller than the un-reinforced case.Pre-reinforcement of the strata results in a reduction of over 95.0%in both the maximum uplift and maximum settlement of the ground surface.

关 键 词：软土地层 盾构姿态 偏转力矩 俯仰角 地层变形 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]