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Numerical Analysis on Ground Settlement Induced by Shield Tunnelling with Adjacent End Shaft Works
(1. Guangzhou Metro Design Institute Co., Ltd., Guangzhou 510010; 2. Jiangxi Key Laboratory of Geotechnical Infrastructure Safety and Control, East China Jiaotong University, Nanchang 330013; 3. Jiangxi Research Center for Underground Space Technology Development and Engineering, East China Jiaotong University, Nanchang 330013)
Abstract Taking the construction of Yayuan Road Station of Nanchang Metro Line 2 as an example, this paper es? tablishes a numerical simulation model of double-line shield tunnelling starting from the end shaft based on the HSS (Hardening Soil model with Small Strain) constitutive model, and analyzes the ground settlement law under the interaction of foundation pit excavation and double-line shield tunnelling. The results show that: (1) ground reinforcing in the shield launching area can effectively reduce the ground settlement within the area, and the magnitude of ground settlement in the area is much smaller than that in the running tunnel section; (2) under the same buried depth condition, the maximum ground settlement value of previously excavated tunnel is higher than that of subsequently excavated tunnel, and the transverse ground settlement trough shows an asymmetric‘W’shape; (3) the ground settlement caused by the interaction of foundation pit excavation and shield tunnelling can be calculated by superposition of the settlement values induced by construction of the two works separately.
Abstract：
Taking the construction of Yayuan Road Station of Nanchang Metro Line 2 as an example, this paper es? tablishes a numerical simulation model of double-line shield tunnelling starting from the end shaft based on the HSS (Hardening Soil model with Small Strain) constitutive model, and analyzes the ground settlement law under the interaction of foundation pit excavation and double-line shield tunnelling. The results show that: (1) ground reinforcing in the shield launching area can effectively reduce the ground settlement within the area, and the magnitude of ground settlement in the area is much smaller than that in the running tunnel section; (2) under the same buried depth condition, the maximum ground settlement value of previously excavated tunnel is higher than that of subsequently excavated tunnel, and the transverse ground settlement trough shows an asymmetric‘W’shape; (3) the ground settlement caused by the interaction of foundation pit excavation and shield tunnelling can be calculated by superposition of the settlement values induced by construction of the two works separately.
WANG Ling1 ZHONG Jiuqiang2,
3 ZHU Bitang2,
3
.Numerical Analysis on Ground Settlement Induced by Shield Tunnelling with Adjacent End Shaft Works[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(1): 124-132
2022, Vol. 59 