scholarly journals Ground Displacements due to the Deformations of Shallow Tunnels with Arbitrary Cross Sections in Soft Ground

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Qiongfang Zhang ◽  
Kang Cheng ◽  
Cungang Lin ◽  
Yadong Lou ◽  
Panpan Guo ◽  
...  
Keyword(s):  
Finite Element ◽  
Cross Sections ◽  
Urban Areas ◽  
Finite Element Simulations ◽  
Soft Ground ◽  
Shallow Tunnels ◽  
Full Plane ◽  
Image Technique ◽  
Cavity Boundary ◽  
Ground Displacements

Nowadays, a huge number of shield-driven tunnels with noncircular cross sections are constructed in urban areas all around the world. However, the ground displacements associated with tunneling still form a difficult issue, especially for noncircular tunnels. In this study, an analytical solution is derived to estimate the ground displacements induced by the deformations of shallow noncircular tunnels in soft ground. First, a solution for the stresses and displacements around a deep tunnel in a full plane is formulated by imposing a specified convergence pattern over the cavity boundary. Subsequently, this solution is validated using finite element simulations in a case study of an elliptical tunnel with four different convergence patterns. Afterward, the solution in the full plane is extended to a half plane using the virtual image technique to estimate the ground displacements around shallow tunnels. The solution is also validated using finite element simulations.

Thermomechanical finite element simulations of ultrasonically assisted turning

2005 ◽  
Vol 32 (3-4) ◽  
pp. 463-471 ◽  
Author(s):  
A.V. Mitrofanov ◽  
V.I. Babitsky ◽  
V.V. Silberschmidt
Keyword(s):  
Finite Element ◽  
Finite Element Simulations

Analysis of Reinforced Concrete Culvert considering Concrete Creep and Shrinkage

1996 ◽  
Vol 1541 (1) ◽  
pp. 120-126
Author(s):  
Charles J. Oswald
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Cross Sections ◽  
Soil Structure ◽  
Silty Clay ◽  
Soil Pressure ◽  
Concrete Creep ◽  
Long Span ◽  
Creep And Shrinkage ◽  
Good Agreement

Measurements made on a long span reinforced concrete arch culvert under 7.3 m (24 ft) of silty clay backfill were compared with results from finite-element analyses of the soil-structure system using the CANDE finite-element code. The culvert strains and deflections and the soil pressure on the culvert were measured during construction and during the following 2.5 years at three instrumented cross sections. The CANDE program was modified to account for the effects of concrete creep and shrinkage strains after it was noted that the measured postconstruction culvert deflection and strains increased significantly whereas the measured soil pressure on the culvert remained relatively constant. Good agreement was generally obtained between measured and calculated values of the culvert strain and deflection and the soil pressure during the entire monitoring period after the code was modified.

Mechanical Testing and Finite Element Simulations for the Use of Cellular Metals as Car Seat Components

2012 ◽  
Vol 83 (10) ◽  
pp. 972-980 ◽  
Author(s):  
Srecko Nesic ◽  
Klaus Unruh ◽  
Wilhelm Michels ◽  
Ulrich Krupp
Keyword(s):  
Finite Element ◽  
Mechanical Testing ◽  
Finite Element Simulations ◽  
Car Seat ◽  
Cellular Metals

Identifying and reducing critical lag in finite element simulations

1996 ◽  
Vol 16 (4) ◽  
pp. 67-71 ◽  
Author(s):  
V.E. Taylor ◽  
Jian Chen ◽  
Milana Huang ◽  
T. Canfield ◽  
R. Stevens
Keyword(s):  
Finite Element ◽  
Finite Element Simulations

Influence Coefficient of Filler Plates in Built-Up Cruciform Section Members Formed by Two Equal-Leg Angles

2011 ◽  
Vol 243-249 ◽  
pp. 584-591
Author(s):  
Long Yu Yang ◽  
Zheng Liang Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bearing Capacity ◽  
High Voltage ◽  
Cross Sections ◽  
Radius Of Gyration ◽  
Influence Coefficient ◽  
Transmission Towers ◽  
Minimal Radius ◽  
Extra High Voltage

The built-up cruciform section formed by two equal-leg angles has been widely applied in extra high voltage(EHV) transmission towers, however, domestic codes provide structure requirement and overlook the influence of multi filler plates to members’ bearing capacity. For the purpose of this, a pin end experiment covering 3 different cross sections(Q420, L160*12, L160*14 and L160*16) and 7 different slendernesses(25~55) has been run. This experiment contains totally 21 specimens. Furthermore, large amounts of models have been analysis by finite element method whose parameters contain variety b/t, λ, filler plate intervals and forms, amount of bolts in filler plate. A recommended formula is given for evaluating the influence of filler plates. The results show: multi filler plates enhance bearing capacity slightly for members with λ less than 35, and the better interval for filler plates is 10i-40i(i is the minimal radius of gyration); filler plates do not work well when b/t of the member is extreme large or small, a propositional b/t range for this kind of member is 11-16; the amount of bolts in filler plate has tiny influence on members’ bearing capacity; the recommended formula is applicable and feasible for design.

scholarly journals Characterizing material liberation of multi-material lightweight structures from shredding experiments and finite element simulations

2021 ◽  
Vol 172 ◽  
pp. 107142
Author(s):  
Magdalena Heibeck ◽  
Martin Rudolph ◽  
Niels Modler ◽  
Markus Reuter ◽  
Angelos Filippatos
Keyword(s):  
Finite Element ◽  
Finite Element Simulations ◽  
Lightweight Structures
Sign in / Sign up

Export Citation Format

Share Document