An analysis of the ground deformation caused by shield tunnel construction combining an elastic half-space model and stochastic medium theory

2016 ◽  
Vol 21 (5) ◽  
pp. 1933-1944 ◽  
Author(s):  
Chenghua Shi ◽  
Chengyong Cao ◽  
Mingfeng Lei
Keyword(s):  
Half Space ◽  
Ground Deformation ◽  
Elastic Half Space ◽  
Shield Tunnel ◽  
Tunnel Construction ◽  
Stochastic Medium ◽  
Medium Theory ◽  
Space Model

scholarly journals An Improved Method for Predicting the Greenfield Stratum Movements Caused by Shield Tunnel Construction

2019 ◽  
Vol 9 (21) ◽  
pp. 4522 ◽  
Author(s):  
Tan ◽  
Zhang ◽  
Zhang ◽  
Zhu ◽  
Tu
Keyword(s):  
Three Dimensional ◽  
Elastic Half Space ◽  
Shield Tunnel ◽  
Theoretical Formula ◽  
Tunnel Construction ◽  
Underground Structures ◽  
Underground Engineering ◽  
Shield Tunneling ◽  
Deep Soil ◽  
Contour Maps

Shield tunneling is becoming the preferred construction scheme for metro construction because of its advantages of fast construction speed and small disturbance. However, limited by process defects, the stratum movements induced by the construction of shield tunnels still affects the safety of nearby underground structures and aboveground buildings. Therefore, the reliable prediction of stratum movements is important. Described in this paper is an analysis method of the Greenfield stratum movements (Greenfield is an area of land that has not yet had buildings on it, stratum movements means the movement of various soil layers) caused by shield tunnel construction combining an elastic half-space model of mirror source–sink method with the use of modified analytical method. Based on the theoretical formula in this paper, not only can the curve of surface settlement trough be calculated, but also the three-dimensional displacement field of deep soil can be obtained. By comparing vertical and horizontal contour maps of Greenfield stratum movements, good consistency between theoretical formula results and centrifugal test results are shown. This solves the defects and limitations of existing two-dimensional formulas; furthermore, based on this, it is convenient to evaluate the effect on the other skewed underground structures through the elastic foundation beam and other similar methods; therefore, this paper can provide a wide guidance and service for the design and construction of underground engineering in the future.

The Improved Soil Model of Finite Compressible Layer

2012 ◽  
Vol 170-173 ◽  
pp. 64-67
Author(s):  
Li Na Yao ◽  
Guang Hua Yang ◽  
Peng Hua Wang
Keyword(s):  
Elastic Modulus ◽  
Half Space ◽  
Elastic Half Space ◽  
Foundation Settlement ◽  
Secant Modulus ◽  
Layer Model ◽  
Space Model ◽  
Soil Model ◽  
Engineering Practices

Choosing an accurate soil model is the key point in calculating the foundation settlement. The commonly used models in engineering practices are the Winkler’s model, elastic half space model and finite compressible layer model. Among these models, the finite compressible layer model is widely used in the designing of raft foundation. As the finite compressible layer model can not reflect the nature of the in situ soil and the nonlinear settlement, in this paper we try to modify the elastic modulus E by the secant modulus in order to improve the soil model of finite compressible layer.

scholarly journals Behaviour of Ground Deformation Around Shield Tunnel Construction in Soft Clay.

1999 ◽  
pp. 311-328
Author(s):  
Takeshi YAMAZAKI ◽  
Masahiro OHTSUKA ◽  
Osamu KUSAKABE
Keyword(s):  
Ground Deformation ◽  
Soft Clay ◽  
Shield Tunnel ◽  
Tunnel Construction
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