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Calculation of Ground Settlements Induced by the Construction of Twin Parallel Shield Tunnels with Small Intervals Based on the Uniform Analytical Solution
(1 Department of Civil Engineering, Zhejiang University City College, Hangzhou 310015; 2 Institute of Geotechnical Engineering,Zhejiang University, Hangzhou 310058)
Abstract A corrected two-dimensional analytical formula is presented based on a uniform soil mass movement model for shield tunnels, and it is used to compute the total ground settlements caused by construction of twin parallel shield tunnels with small intervals. The proposed formula is applicable for the approaching construction of twin parallel tunnels under the condition of a relative horizontal distance coefficient C=L/(h+R)≤0.66, while it is inapplicable if C is larger than 0.66; the settlements curve is a“V”shape if C is lower than or equal to 0.66, it is a“V-W” shape if C is larger than 0.66 and lower than or equal to 0.79, and it is a“W”shape if C is larger than 0.79. The calculation example analysis show that: the ground settlements calculated by the proposed formula agree well with the measured values when C is lower than or equal to 0.66; the curve of ground settlements caused by approaching construction of twin parallel shield tunnels conforms with the normal distribution law but the maximum settlement sometimes may deviate from the central axis.
Abstract：
A corrected two-dimensional analytical formula is presented based on a uniform soil mass movement model for shield tunnels, and it is used to compute the total ground settlements caused by construction of twin parallel shield tunnels with small intervals. The proposed formula is applicable for the approaching construction of twin parallel tunnels under the condition of a relative horizontal distance coefficient C=L/(h+R)≤0.66, while it is inapplicable if C is larger than 0.66; the settlements curve is a“V”shape if C is lower than or equal to 0.66, it is a“V-W” shape if C is larger than 0.66 and lower than or equal to 0.79, and it is a“W”shape if C is larger than 0.79. The calculation example analysis show that: the ground settlements calculated by the proposed formula agree well with the measured values when C is lower than or equal to 0.66; the curve of ground settlements caused by approaching construction of twin parallel shield tunnels conforms with the normal distribution law but the maximum settlement sometimes may deviate from the central axis.
.Calculation of Ground Settlements Induced by the Construction of Twin Parallel Shield Tunnels with Small Intervals Based on the Uniform Analytical Solution[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(2): 87-95
2017, Vol. 54 