Design and construction of deep excavation engineering adjacent to the subway tunnel in Shanghai soft soil

2012 ◽  
pp. 803-810
Author(s):  
Li Jinjun ◽  
Wang Weidong ◽  
Tan Ke
Keyword(s):  
Soft Soil ◽  
Deep Excavation ◽  
Subway Tunnel ◽  
Design And Construction

scholarly journals Design and construction of a deep excavation in soft soils adjacent to the Shanghai Metro tunnels

2003 ◽  
Vol 40 (5) ◽  
pp. 933-948 ◽  
Author(s):  
Z F Hu ◽  
Z Q Yue ◽  
J Zhou ◽  
L G Tham
Keyword(s):  
Ground Improvement ◽  
Soft Soil ◽  
Soft Clay ◽  
Theoretical Method ◽  
Horizontal Displacement ◽  
Deep Excavation ◽  
Construction Methods ◽  
Diaphragm Walls ◽  
Shanghai Metro ◽  
Design And Construction

This paper presents the design and construction of a deep excavation for building foundations in saturated soil. This deep excavation was of particular interest because it was located above and beside the Shanghai Metro tunnels. The twin Shanghai Metro tunnels had to be in full operation during the deep excavation. Potential large deformation of the twin tunnels was one of the main concerns during the design and construction for the deep excavation. The paper discusses in detail the criteria and measures for controlling the soil and tunnel deformation. The measures included cast-in-place concrete diaphragm walls with bracing structural members, pumping consolidation, cement–soil mix pile systems, and rational excavation procedures. A simplified theoretical method was proposed to estimate the increment in undrained shear strength in a soft clay layer due to pumping consolidation. Furthermore, conventional finite element methods were used to predict the soil vertical and horizontal displacements induced by the excavation. Using the design and construction methods discussed in the paper, the settlement and horizontal displacement of the tunnels were successfully controlled within 5.0 mm and 9.0 mm, respectively. The curvature of longitudinal deformation curve of the tunnels was less than 1/15 000. The horizontal displacement of the braced diaphragm walls was less than 0.12% of the total excavation depth. Key words: Metro tunnels, saturated soft soil, deep excavation, design, construction, ground improvement, case studies.

Prediction of long-term settlements of subway tunnel in the soft soil area

2014 ◽  
Vol 74 (2) ◽  
pp. 1007-1020 ◽  
Author(s):  
Zhen-Dong Cui ◽  
Shi-Xi Ren
Keyword(s):  
Soft Soil ◽  
Subway Tunnel ◽  
Soft Soil Area ◽  
Soil Area

scholarly journals The Influence of the Track Parameters on Vibration Characteristics of Subway Tunnel

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Wenbo Shi ◽  
Linchang Miao ◽  
Junhui Luo ◽  
Honglei Zhang
Keyword(s):  
Soft Soil ◽  
Power Level ◽  
Coupling Model ◽  
Calculation Model ◽  
Vertical Acceleration ◽  
Subway Tunnel ◽  
Ballastless Track ◽  
Train Operation ◽  
The Impact ◽  
Wheel Track

In soft soil areas, such as the Nanjing, it is very important to quantitatively analyze the dynamic behaviors of soft soils during the metro train operation. A nonlinear coupling model of wheel-track and a finite element calculation model of tunnel and soil were established based on the mechanical character of elastic supporting block ballastless track and the actual parameters of Nanjing soft soil. The time-variant vertical acceleration of the rail, the sleepers, and the surface of the tunnel can be calculated by the models, and the frequency dependence acceleration was verified by the fast Fourier transform algorithm. A modified vibration power level for human sensitivity was used to quantify the vibration energy of each part of the system, and the impact of the parameters in the model was evaluated. The results can be applied to the metro design and construction, which also can be the guidance during the tunnel construction.

SDMT-Based Numerical Analyses of Deep Excavation in Soft Soil

2019 ◽  
Vol 145 (1) ◽  
pp. 04018102 ◽  
Author(s):  
Alessandra Di Mariano ◽  
Sara Amoroso ◽  
Marcos Arroyo ◽  
Paola Monaco ◽  
Antonio Gens
Keyword(s):  
Soft Soil ◽  
Numerical Analyses ◽  
Deep Excavation

scholarly journals Study on construction risk and control technology of subway tunnel in soft soil stratum

2021 ◽  
Vol 634 (1) ◽  
pp. 012116
Author(s):  
Heng Kong ◽  
Fei Guo ◽  
Mi Zhang ◽  
Shenglei Gao ◽  
Kaili Wang
Keyword(s):  
Soft Soil ◽  
Control Technology ◽  
Subway Tunnel ◽  
Soil Stratum ◽  
Construction Risk ◽  
And Control

Study on the Long-term Settlement of Subway Tunnel in Soft Soil Area

2015 ◽  
Vol 34 (5) ◽  
pp. 486-492 ◽  
Author(s):  
Jun Tan ◽  
Zhen-Dong Cui ◽  
Li Yuan
Keyword(s):  
Soft Soil ◽  
Subway Tunnel ◽  
Soft Soil Area ◽  
Soil Area

scholarly journals Prediction of behaviour of a deep excavation in soft soil: a case study

2016 ◽  
Vol 11 (1) ◽  
pp. 10-19 ◽  
Author(s):  
T. Bhatkar ◽  
D. Barman ◽  
A. Mandal ◽  
A. Usmani
Keyword(s):  
Soft Soil ◽  
Deep Excavation
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