Numerical simulations on the lateral deformation in soft ground under embankments

2008 ◽  
Author(s):  
C. Yu ◽  
L. Y. Pan ◽  
G. Y. Du ◽  
Chen Lei
Keyword(s):  
Numerical Simulations ◽  
Soft Ground ◽  
Lateral Deformation

scholarly journals Self-Excited Lateral Vibrations of Rolling Tires

2015 ◽  
Author(s):  
Dénes Takács ◽  
Gábor Stépan
Keyword(s):  
Numerical Simulations ◽  
Mechanical Model ◽  
Critical Parameter ◽  
Lateral Deformation ◽  
Contact Patch ◽  
Lateral Vibrations ◽  
Low Degree ◽  
Minimum Number ◽  
Lateral Mode ◽  
Parameter Ranges

In this study, a low degree-of-freedom mechanical model of a rolling tire is constructed, in which the lateral deformation of the contact patch and tire carcass is considered. The so-called delayed contact patch model is implemented and combined with a simple tire carcass model. The interaction between the contact patch and the carcass together with the lateral mode of the attached suspension system is modeled by means of minimum number of relevant parameters in a simplified way in order to construct analytical results. Critical parameter ranges of self-excited vibrations are determined against the longitudinal speed of the tire. The intricate shapes of the corresponding tire deformations are presented by means of numerical simulations.

Modeling the Stone Column Behavior in Soft Ground with Special Emphasis on Lateral Deformation

2017 ◽  
Vol 143 (6) ◽  
pp. 04017016 ◽  
Author(s):  
Sudip Basack ◽  
Buddhima Indraratna ◽  
Cholachat Rujikiatkamjorn ◽  
Firman Siahaan
Keyword(s):  
Stone Column ◽  
Soft Ground ◽  
Lateral Deformation

Kinematics of Wheel-Type Tracked Vehicle with Crawlers in Between the Front and Rear Wheels

2012 ◽  
Vol 24 (6) ◽  
pp. 933-938
Author(s):  
Ryosuke Eto ◽  
◽  
Tomoaki Satomi ◽  
Hiroshi Takahashi
Keyword(s):  
Numerical Simulations ◽  
Inverse Kinematics ◽  
Soft Ground ◽  
Optimal Conditions ◽  
Constraint Condition ◽  
Tracked Vehicle ◽  
Tracked Vehicles ◽  
Turn On

Tracked vehicles are generally trucked to the field because they cannot move on the pavement. This operation is very slow and inefficient. To solve the problem, it is necessary to develop tracked vehicles that can move swiftly on both soft ground and pavement. Wheel-type tracked vehicles with crawlers in between the front and rear wheels can move swiftly using only the wheels on pavement and both wheels and crawlers on soft ground. However, such vehicles cannot turn on both wheels and crawlers. In this study, this steering constraint condition of the vehicle was analyzed with inverse kinematics. Using the obtained optimal conditions, numerical simulations and experiments were carried out. The vehicle’s turning performance was also shown to improve.

The Application of the Capped PTC Pile in Expressway Widening on Soft Foundation

2011 ◽  
Vol 243-249 ◽  
pp. 2938-2943
Author(s):  
Chun Yuan Liu ◽  
Hai Chao Song ◽  
Gong Pan ◽  
Jun Qi Zhang ◽  
Cheng Wei Liu
Keyword(s):  
Pore Water Pressure ◽  
Water Pressure ◽  
Ground Improvement ◽  
Soft Ground ◽  
Lateral Deformation ◽  
Soil Pressure ◽  
Ground Treatment ◽  
Soft Foundation ◽  
Concrete Pile ◽  
Soft Ground Improvement

Prestressed Tubular Concrete pile (PTC pile) with individual cap is applied in soft ground treatment in the widening project of Jin-bin expressway. The observed data on embankment settlement, soil pressure, pore water pressure and lateral deformation, investigate the effect of the application of PTC pile in soft ground improvement for extension project of Jin-bin expressway in Tianjin soft area.

Saturation mechanism and generated viscosity in gravito-turbulent accretion disks

2020 ◽  
Vol 640 ◽  
pp. A53
Author(s):  
L. Löhnert ◽  
S. Krätschmer ◽  
A. G. Peeters
Keyword(s):  
Growth Rate ◽  
Numerical Simulations ◽  
Accretion Disks ◽  
Gravitational Instability ◽  
Turbulent Viscosity ◽  
Radial Distance ◽  
Maximum Growth ◽  
Wave Number ◽  
Radiative Cooling ◽  
Mixing Length

Here, we address the turbulent dynamics of the gravitational instability in accretion disks, retaining both radiative cooling and irradiation. Due to radiative cooling, the disk is unstable for all values of the Toomre parameter, and an accurate estimate of the maximum growth rate is derived analytically. A detailed study of the turbulent spectra shows a rapid decay with an azimuthal wave number stronger than ky−3, whereas the spectrum is more broad in the radial direction and shows a scaling in the range kx−3 to kx−2. The radial component of the radial velocity profile consists of a superposition of shocks of different heights, and is similar to that found in Burgers’ turbulence. Assuming saturation occurs through nonlinear wave steepening leading to shock formation, we developed a mixing-length model in which the typical length scale is related to the average radial distance between shocks. Furthermore, since the numerical simulations show that linear drive is necessary in order to sustain turbulence, we used the growth rate of the most unstable mode to estimate the typical timescale. The mixing-length model that was obtained agrees well with numerical simulations. The model gives an analytic expression for the turbulent viscosity as a function of the Toomre parameter and cooling time. It predicts that relevant values of α = 10−3 can be obtained in disks that have a Toomre parameter as high as Q ≈ 10.

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