An improved method to calculate the vertical earth pressure for deep shield tunnel in Shanghai soil layers

2018 ◽  
Vol 75 ◽  
pp. 43-66 ◽  
Author(s):  
Kai-Hua Chen ◽  
Fang-Le Peng
Keyword(s):  
Earth Pressure ◽  
Shield Tunnel ◽  
Improved Method ◽  
Soil Layers ◽  
Vertical Earth Pressure

scholarly journals Model Test on the Influence of Surcharge, Unloading and Excavation of Soft Clay Soils on Shield Tunnels

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2020
Author(s):  
Pengfei Xiang ◽  
Gang Wei ◽  
Shuming Zhang ◽  
Yunliang Cui ◽  
Huifang Guo
Keyword(s):  
Model Test ◽  
Soft Clay ◽  
Earth Pressure ◽  
Confining Pressure ◽  
Surface Settlement ◽  
Clay Soils ◽  
Shield Tunnel ◽  
Weak Points ◽  
Radar Chart ◽  
Vertical Earth Pressure

In view of the influence of symmetrical surcharge, unloading and excavation of soft clay soils on shield tunnels, the surface settlement, tunnel settlement, vertical additional earth pressure and tunnel additional confining pressure are measured by an indoor model test. The changes of confining pressure, tunnel settlement, surface settlement and vertical earth pressure caused by surcharge, unloading and excavation are studied and analyzed. The results show that, in soft clay, surcharge will cause tunnel settlement, and unloading and excavation will generally cause tunnel uplift. There is hysteresis in surface settlement and tunnel settlement above the shield tunnel caused by surcharge and unloading; the change of additional confining pressure of the shield tunnel caused by surcharge is mainly concentrated in the three directions of 3, 5 and 7 of the radar chart. These points belong to weak points. Unloading and excavation can effectively reduce the additional confining pressure of the tunnel in these three directions; excavation will cause the increase of vertical cumulative additional earth pressure and tunnel confining pressure in local directions. The influence range of surcharge in soft clay is wider than that in sand, but the depth is relatively shallow.

The Influence of Earth Pressure Balanced Shield Tunnel Underpassing Coastal Water Body on Stratum Deformation

2019 ◽  
Vol 83 (sp1) ◽  
pp. 237 ◽  
Author(s):  
Caixia Guo ◽  
Xiaoming Guan ◽  
Leilei Shi ◽  
Shengyuan Qiu
Keyword(s):  
Coastal Water ◽  
Water Body ◽  
Earth Pressure ◽  
Shield Tunnel ◽  
Stratum Deformation

Method of Calculating Chamber Earth Pressure of EPB Shield

2014 ◽  
Vol 886 ◽  
pp. 426-431 ◽  
Author(s):  
Bo Liang ◽  
Jing Cao ◽  
Hai Xing Yang ◽  
Zu De Ding ◽  
Hui Ming Zhao
Keyword(s):  
Limit Equilibrium ◽  
Earth Pressure ◽  
Relative Displacement ◽  
Shield Tunnel ◽  
Limit States ◽  
Relationship Of ◽  
The Relationship ◽  
Epb Shield ◽  
Selection Of ◽  
Construction Practice

In order to calculate earth pressure in working chamber, three calculation modes which corresponding to status of elastic balanced, active limit equilibrium and passive limit equilibrium of the soil on the excavation face was built. The relationship of relative displacement between the soil in the chamber and the soil on the excavation face of shallow EPB shield tunnel was analyzed based on Rankines earth pressure theory. The threshold of chamber earth pressure values which correspond to the limit states of subsidence and upheaval were deduced and the reasonable range of the values were obtained. Combined with a shield tunnel construction practice, the theoretical and measured values are compared. The results show that the theoretical equations are valid and can provide a theoretical approach for the selection of chamber earth pressure.

Research on Chamber Earth Pressure of EPB Shield Considering Soil Arching Effect

2014 ◽  
Vol 1065-1069 ◽  
pp. 373-377
Author(s):  
Jing Cao ◽  
Hai Xing Yang ◽  
Bo Liang ◽  
Hai Ming Liu
Keyword(s):  
Earth Pressure ◽  
Shield Tunnel ◽  
Pressure Balance ◽  
Soil Arching ◽  
Shield Tunneling ◽  
Arching Effect ◽  
Soil Arching Effect ◽  
Earth Pressure Balance ◽  
Tunnel Depth ◽  
Epb Shield

Chamber earth pressure is one of the significant parameters during the Earth Pressure Balance (EPB) shield construction processing. The soil arching effect is existence when the tunnel depth is enough. It is significant to consider the influence of arching effect to analyze the pressure in soil chamber in shield tunneling. In this paper, the influence of arching effect is considered to calculate the chamber earth pressure. Firstly, the soil is supposed as loose media, and the necessary buried depth of producing arching affects is deduced according to the loose media theory. Then, based on the characteristic of proper arching axis, the equation and the height of proper arch are obtained. At last, the calculation formula of minimum chamber earth pressure of EPB shield tunnel is deduced which can consider the effect of arching effect.

scholarly journals SEASONAL CHANGE OF VERTICAL EARTH PRESSURE IN PAVED ROAD AT COLD REGION

2015 ◽  
Vol 71 (2) ◽  
pp. I_475-I_484
Author(s):  
Shintaro SUZUKI ◽  
Takayuki KAWAGUCHI ◽  
Dai NAKAMURA ◽  
Syunzo KAWAJIRI ◽  
Satoshi YAMASHITA ◽  
...  
Keyword(s):  
Seasonal Change ◽  
Earth Pressure ◽  
Cold Region ◽  
Paved Road ◽  
Vertical Earth Pressure

Vertical Earth Pressure Design for High-Filled Cut-and-Cover Tunnels

2019 ◽  
Vol 56 (3) ◽  
pp. 184-190 ◽  
Author(s):  
S. Li ◽  
Y. X. Yao ◽  
I. H. Ho ◽  
L. Ma ◽  
Q. C. Wang ◽  
...  
Keyword(s):  
Earth Pressure ◽  
Vertical Earth Pressure
Sign in / Sign up

Export Citation Format

Share Document