Studies for Deformation of Slurry Shield Construction under Across and Parallel Existing Tunnel

2012 ◽  
Vol 204-208 ◽  
pp. 1435-1438
Author(s):  
Yong Qi Ma ◽  
Yin Ning ◽  
Yi Dong ◽  
Feng Lin Wu
Keyword(s):  
Three Dimensional ◽  
Ground Surface ◽  
Initial Position ◽  
Practical Significance ◽  
Engineering Construction ◽  
Dimensional Finite Element ◽  
Survey Results ◽  
Three Dimensional Finite Element ◽  
Slurry Shield ◽  
Surface Settlements

The method combining the construction survey and the numerical simulation is proposed in the paper to accurately obtain the deformation of the slurry shield construction under across and parallel existing tunnel. The surface settlements of the engineering construction initial position are surveyed. The reliability of the three dimensional finite element models is verified by comparing with the survey results. The deformation variation of the existing tunnel and ground surface are obtained by the elastoplasticity nonlinear calculations, showing the feasibility and effectiveness of the proposed method and the credibility and accuracy of the calculated results. Meanwhile, the measures of control deformation are presented. The surveyed settlements after the construction process of implementing measures are smaller than those calculated, indicating the effect obviously of the measures which has practical significance.

The Analysis of Stratum Settlement for a Large Diameter Slurry Shield Obliquely Under-Passing Embankment of the Yangtze River

2014 ◽  
Vol 919-921 ◽  
pp. 895-901 ◽  
Author(s):  
Zhou Yun Jiang ◽  
Jie Yu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Yangtze River ◽  
Large Diameter ◽  
Three Dimensional ◽  
The Yangtze River ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Slurry Shield ◽  
Element Method

Displacement caused by tunnel excavation soil may cause the deformation of the buildings or structures nearby and even cause disaster. On the background of a large diameter slurry shield obliquely Under-passing embankment of The Yangtze River. First of all, three dimensional finite element method is used to make a dynamic analysis of the embankment settlement. And the result is compared with the measured values, the accuracy of the finite element method was verified. Then, the stratum settlement of embankment is analyzed under different cross Angle and depth of tunnel. Some useful conclusions are drawn, which can provide some useful reference for similar engineering of tunnel under-passing embankment.

Simulation and Survey of Stratum Disturbance for Shield Tunneling in Water-Rich Soil Layers

2016 ◽  
Vol 680 ◽  
pp. 486-490
Author(s):  
Huai Liang Zhu ◽  
Li Feng Yu ◽  
L.C. Wei
Keyword(s):  
Hybrid Approach ◽  
Three Dimensional ◽  
Ground Surface ◽  
Survey Method ◽  
Shield Tunneling ◽  
Soil Layers ◽  
Normal Distribution Curve ◽  
Site Survey ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

In this paper, a hybrid approach is presented for modeling the stratum disturbance during the shield construction in water-rich soil. The disturbance mechanism of stratum is analyzed based on the theory of shield excavation. The deformation and settlement of ground surface are simulated by three-dimensional finite element method. Some physical properties and displacements of soil layers are measured by site survey method. The transverse settlement trough of tunnel is a normal distribution curve and the largest displacement to happen on the above of excavation face. There is also an important influence of shield tunneling on the ground settlement in the longitudinal profile, but this effect disappears a certain distance apart. It is shown that the results based on the numerical simulation and the data from site survey in this work are much rational.

Crack Mechanism, Temperature Control, and Anti-Cracking Measures of Sluice

2013 ◽  
Vol 405-408 ◽  
pp. 1217-1220
Author(s):  
Zhen Hong Wang ◽  
Guo Xin Zhang ◽  
Shu Ping Yu
Keyword(s):  
Temperature Control ◽  
Three Dimensional ◽  
Control Measures ◽  
Construction Technology ◽  
Element Analysis ◽  
Engineering Construction ◽  
Simulation Calculation ◽  
Project Construction ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

To address the problem of sluice concrete easily cracking during construction, this study introduces the crack mechanism of concrete structures. Temperature differences and constraints are the main causes of cracks. Anti-cracking measures should focus on optimizing concrete mixing ratio and improving construction technology. Using simulation calculation to model the actual construction process and temperature control measures, this study analyzes the causes of crack and selects timely and reasonable temperature control measures, which are necessary links in engineering construction. A three-dimensional finite element analysis was conducted for a huge concrete sluice structure. The causes of cracks are discussed, and timely and feasible anti-cracking measures are proposed to provide technical support for project construction.

Three-dimensional deformation behavior of the Taipei National Enterprise Center (TNEC) excavation case history

2000 ◽  
Vol 37 (2) ◽  
pp. 438-448 ◽  
Author(s):  
Chang-Yu Ou ◽  
Bor-Yuan Shiau ◽  
I-Wen Wang
Keyword(s):  
Finite Element ◽  
Plane Strain ◽  
Case History ◽  
Three Dimensional ◽  
Ground Surface ◽  
Element Analysis ◽  
Case Record ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
National Enterprise

The Taipei National Enterprise Center (TNEC) excavation project was constructed using the top-down construction method, in which a diaphragm wall was supported by the concrete floor slab. Previous studies have reported the deformation and stress-strain behaviors along the main observation section, which was considered to be in the plane strain condition. This paper examines the three-dimensional movements of the soil and wall through field observations and finite element analyses. The results indicate that the soil outside the excavation zone tends to move toward the excavation center. Such a tendency increases with excavation depth. The soil settlement near the corner of the excavation is less than that near the center due to the corner effect. The empirical equation proposed by Clough and O'Rourke for estimating the ground settlement appears to be adequate for plane strain sections and other non-plane strain sections. Numerical studies indicate that the wall deformation and ground surface settlement can be reasonably predicted using three-dimensional finite element analysis. Parametric studies revealed that for this case record zoned excavation commencing near the final stage of excavation has very little effect on excavation behavior.Key words: TNEC case history, deep excavation, deformation, three-dimensional finite element method.

scholarly journals Design Optimization of Concrete Aqueduct Structure considering Temperature Effects

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Liang-ze-nan Wang ◽  
Chao Su
Keyword(s):  
Construction Projects ◽  
Three Dimensional ◽  
Design Parameters ◽  
Reinforced Concrete Structure ◽  
Original Design ◽  
Engineering Construction ◽  
Field Coupling ◽  
Dimensional Finite Element ◽  
Water Conveyance ◽  
Three Dimensional Finite Element

An aqueduct is a water conveyance structure that enables channel flow across canals, valleys, depressions, roads, and other structures. The optimal structural selection of the aqueduct is particularly important to ensure engineering quality and optimize project investment. To optimize the design of an aqueduct structure, this study established a mathematical model based on the three-dimensional finite element method that considers the temperature field and structural stress field coupling among its design parameters. The model was used to optimize and design the main wall thickness and tie spacings of the aqueduct structure. The Caohe aqueduct was considered as an example for the proposed design. The influences of temperature-induced stress on the reinforced concrete structure of the aqueduct in winter and summer were investigated based on the actual engineering conditions of the structure, and the corresponding structural optimization was obtained. The results showed that the optimized aqueduct can offset temperature and structural stresses, thus reducing the amount of material required. The maximum generated stress was also lower than that of the original design. Furthermore, this study is expected to provide guidance for similar engineering construction projects.

Numerical Investigation of Shield Cross Tunnel Minimum Cover Depth

2012 ◽  
Vol 256-259 ◽  
pp. 1270-1275
Author(s):  
Guang Ming Li ◽  
Jin Li Qiao ◽  
Pei Chen
Keyword(s):  
Surface Deformation ◽  
Three Dimensional ◽  
Ground Surface ◽  
Subway Tunnel ◽  
Cover Depth ◽  
Minimum Cover ◽  
Geological Conditions ◽  
Dimensional Finite Element ◽  
The Cross ◽  
Three Dimensional Finite Element

With the development construction of subway in the city, the cross tunnel is becoming common. However, due to the geological conditions of the subway which limited the minimum depth of the shallow overburden of the tunnel is not the same. In this paper, according to the mechanical characteristics of the cross subway tunnel in several typical soil, a three-dimensional finite element mode is established. And to find out the discipline of minimum cover depth in vertical cross the tunnel by researching tunnel shield excavation the ground surface deformation characteristics.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

Tire Modeling by Finite Elements

1992 ◽  
Vol 20 (1) ◽  
pp. 33-56 ◽  
Author(s):  
L. O. Faria ◽  
J. T. Oden ◽  
B. Yavari ◽  
W. W. Tworzydlo ◽  
J. M. Bass ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rolling Contact ◽  
Test Problems ◽  
State Behavior ◽  
Normal Contact ◽  
New Developments ◽  
Applied Torque ◽  
Dimensional Finite Element ◽  
Tire Modeling ◽  
Three Dimensional Finite Element

Abstract Recent advances in the development of a general three-dimensional finite element methodology for modeling large deformation steady state behavior of tire structures is presented. The new developments outlined here include the extension of the material modeling capabilities to include viscoelastic materials and a generalization of the formulation of the rolling contact problem to include special nonlinear constraints. These constraints include normal contact load, applied torque, and constant pressure-volume. Several new test problems and examples of tire analysis are presented.

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