Abstract
The influence of boundary soil properties on tunneling-induced ground settlement is generally not considered in current analytic solutions, and the hypothesis of equal initial stress in vertical and horizontal makes the application of the above solutions limited. Based on the homogeneous half-plane hypothesis, by defining the boundary condition according to the ground loss pattern in shallow tunnel, and with the use of Mohr-Coulomb plastic yielding criteria and classic Lame and Kiersch elastic equations by separating the nonuniform stress field to uniform and single-direction stress field, a semiempirical solution for ground settlement induced by single shallow circular tunnel is presented and sensitivity to the ground parameters is analyzed. The methods of settlement control are offered by influence factors analysis of semiempirical solution. A case study in Beijing Metro tunnel shows that the semiempirical solution agrees well with the in situ measured results.
Highlights
With the rapid development of China’s urban infrastructure construction, the shield tunneling is widely used as a safe and efficient tunnel construction method in urban subway, underground pipeline, and so on
There are still a series of problems needing to be solved in the metro shield tunneling construction; one of the problems that should be urgently solved is the prediction and control of the shield tunneling construction induced ground surface settlement [1, 2]
A large number of analytical solutions for axisymmetric circular tunnels in strain plane state have been presented [3,4,5,6,7,8,9,10,11], but those analytic methods are seldom considering the influence of ground soil properties on shield tunnel induced ground settlement, and some methods are based on the assumption of homogeneous semi-infinite plane; the calculated results are suitable for the deep buried tunnel surface settlement calculation but are not fully applicable for most shallow-buried tunnel, which limits the use of those methods
Summary
With the rapid development of China’s urban infrastructure construction, the shield tunneling is widely used as a safe and efficient tunnel construction method in urban subway, underground pipeline, and so on. There are still a series of problems needing to be solved in the metro shield tunneling construction; one of the problems that should be urgently solved is the prediction and control of the shield tunneling construction induced ground surface settlement [1, 2]. A large number of analytical solutions for axisymmetric circular tunnels in strain plane state have been presented [3,4,5,6,7,8,9,10,11], but those analytic methods are seldom considering the influence of ground soil properties on shield tunnel induced ground settlement, and some methods are based on the assumption of homogeneous semi-infinite plane; the calculated results are suitable for the deep buried tunnel surface settlement calculation but are not fully applicable for most shallow-buried tunnel, which limits the use of those methods. It is an urgent problem to find suitable methods to calculate shallow shield tunnel surface settlement
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