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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

第11卷    第5期    总第61期    2014年10月

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文章编号:1672-7029(2014)05-0131-08
复合地层盾构穿越机场诱发地层沉降计算及控制研究
李振1,魏丽敏2,彭富强1

(1.湖南交通职业技术学院 岩土工程材料研究所,湖南 长沙 410132;
2.中南大学 土木工程学院,湖南 长沙 410075
)

摘 要: 依托南京轨道交通盾构施工穿越禄口机场段工程,针对上软下硬复合地层盾构施工诱发地层沉降及控制技术进行研究,建立穿越机场前试验段地层沉降初步预测的数值计算模型,通过现场监测数据进行模型参数调整,用于穿越机场时地层沉降的地表沉降的计算;并提出适用于上软下硬复合地层穿越重要建(构)筑物区间的施工控制技术。研究结果表明:隧道横向不均匀沉降影响范围在隧道两侧1.5D范围内;采用“欠土压推进”的模式,穿越重要构筑物区间时地面沉降可控制在允许的范围内。

 

关键字: 复合地层;穿越机场;地表沉降;数值计算;施工控制技术

Construction control and calculation of settlement induced
Zhen1, WEI Limin2, PENG Fuqiang1

1. Institute of Geotechnical Engineering Materials, Hunan Communication Polytechnic, Changsha 410132, China;
2. School of Civil Engineering, Central South University, Changsha 410075, China

Abstract:On the background of shield construction undercrossing Lukou airport section of Nanjing Metro, the settlement induced by control and calculation of shield construction in upper soft and lower hard mixed ground was studied. The numerical model was established for the preliminary forecasting of ground settlement in test section before shield undercrossing airport. The model parameters were adjusted by site monitoring data, and then, the ground settlement of shield undercrossing airport was calculated. Finally the construction control technology of shield undercrossing important structures interval was proposed in upper soft and lower hard mixed ground. The results show that the influence of transverse differential settlement is in the range of both sides of 1.5D of the tunnel. In addition, when shield machinery undercrossing intervals with important structures, the settlement can be controlled within a permissible range by the mode of ''''under earth pressure''''.

 

Key words: mixed ground; undercrossing airport; ground settlement; numerical calculation; construction control technology

ISSN 1672-7029
CN 43-1423/U

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