Slope Safety of Earth Rockfill Cofferdam with Nonlinear Shear Strength

2011 ◽  
Vol 243-249 ◽  
pp. 4472-4477
Author(s):  
Xiao Chun Lu ◽  
Bin Tian ◽  
Yan Fu Qin
Keyword(s):  
Shear Strength ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Analysis Method ◽  
Seepage Field ◽  
Construction Period ◽  
Practical Project ◽  
The Stability ◽  
Nonlinear Shear ◽  
Effective Analysis

Based on numerical simulation of the seepage field of earth rockfill cofferdam using nonlinear Finite Element Method under the action of flood during construction period, the stability of the cofferdam slope with nonlinear shear strength is studied. The effectiveness and applicability of the method introduced in the paper is certified through computation in the study on the practical project. The paper provides an effective analysis method for the study on the stability of dam slope of earth rockfill cofferdam.

Safety Analysis of the Temporary Dam Body of Concrete Faced Rockfill Dam during Construction Period

2011 ◽  
Vol 255-260 ◽  
pp. 3676-3681 ◽  
Author(s):  
Xiao Chun Lu ◽  
Bin Tian ◽  
Suo Zhang
Keyword(s):  
Numerical Simulation ◽  
Flood Control ◽  
Analysis Method ◽  
Nonlinear Fem ◽  
Seepage Field ◽  
Construction Period ◽  
Rockfill Dam ◽  
Practical Project ◽  
The Stability ◽  
Effective Analysis

Concrete faced Rockfill dam (CFRD) is a safe and economical dam type in hydraulic engineering. The temporary dam body for flood control during construction period is usually used for CFRD, so the safety of temporary dam body during construction period is very important. Based on numerical simulation of the seepage field of the temporary dam body of CFRD using nonlinear FEM (Finite Element Method) under the action of flood of the river during construction period, the stability of the dam slope is studied. The effectiveness and applicability of the method introduced is certified through computation in the study on the practical project. The paper provides an effective analysis method for the study on the stability of dam slope of the temporary dam body of CFRD for flood control during construction period.

Cause Analysis on the Cracks in Concrete Plate of Canal Lining

2013 ◽  
Vol 405-408 ◽  
pp. 2596-2599 ◽  
Author(s):  
Jian Hua Cui ◽  
Zhi Qiang Xie ◽  
Han Jiang Xiao
Keyword(s):  
Finite Element Method ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Foundation Soil ◽  
Cause Analysis ◽  
Construction Period ◽  
Concrete Plate ◽  
Operation Period ◽  
External Loads

Concrete cracks often appear in construction period and operation period of the canal lining. For analyzing the cause of these cracks, the factors which will cause cracks are classified based on the data collected. Also sensitivity analysis on these factors is carried out with 3D contact nonlinear finite element method. The result shows that, the factors which resulting in concrete cracks are temperature variation, humidity, uneven settlement of foundation, expansion deformation of foundation soil, external loads etc.; Joint-cutting should be done as soon as possible, expansive property of the foundation soil and construction quality of canal lining should be strictly controlled.

Character of Embankment Reinforced with Geotextile on Sloping Weak Foundation

2010 ◽  
Vol 168-170 ◽  
pp. 1272-1276
Author(s):  
Jin Long Liu ◽  
Jie Qun Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Plastic Zone ◽  
Lateral Displacement ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
The Stability ◽  
Peak Value ◽  
Element Method

Based on nonlinear finite element method, the character of embankment reinforced with geotextile on sloping weak foundation has been studied. It is shown that the lateral displacement of embankment has been distinctly effected by the sloping of foundation, the value of lateral displacement on sloping foundation is greatly bigger than that of horizontal foundation. The peak value of lateral displacement can be effectively reduced by geotextile. With the same condition, geotextile in sloping foundation acts a more important effect than that of horizontal foundation. The development of plastic zone of embankment has been impeded and separated by geotextile, which enhanced the stability of embankment. The results also indicated that, if necessary, reinforcement such as anti-slide pile should be layout at lower toe of embankment on sloping weak foundation.

Study on Stability Round Stronger Axis of the Column with Composite Section of Double Limbs under Axial Compression

2010 ◽  
Vol 163-167 ◽  
pp. 633-640
Author(s):  
Deng Feng Wang ◽  
Yuan Qing Wang ◽  
Yong Jiu Shi ◽  
Bin Fang
Keyword(s):  
Axial Compression ◽  
Electrostatic Precipitator ◽  
Nonlinear Finite Element ◽  
Thickness Ratio ◽  
Nonlinear Finite Element Method ◽  
Stability Performance ◽  
Composite Section ◽  
Geometrical Imperfections ◽  
The Stability ◽  
Flexural Torsional Buckling

The section of the column under axial compression used in a certain electrostatic precipitator is composed of double H shaped steel limbs and the stiffened connecting web by weld. As the width of connecting web usually exceeds 3 times of the section height of H shaped steel, the axis which connecting web lies in is the weaker axis for the stiffness of column section, while the midperpendicular of connecting web is the stronger axis. In consideration of initial geometrical imperfections and weld residual stresses, the study on stability round the stronger axis of column subjected to axial compression by nonlinear finite element method is conducted. The research results indicate that the column doesn’t present the flexural buckling round the stronger axis, but present the elasto-plastic flexural-torsional buckling. A buckling factor is produced to measure the stability performance of column round stronger axis. When the connecting channel shaped steels between two limbs and the stiffeners located on connecting web are strengthened, the buckling factor increases slightly. When the width-thickness ratio of connecting web increases, the buckling factor decreases significantly. When the slenderness of H shaped steel round the stronger axis is kept constant and the height-thickness ratio of H-shaped steel web increases, the buckling factor increases. Based on a great many computation results, the regressed recommendation is proposed how to evaluate the design buckling bearing capacity of column under axial compression round stronger axis.

Characters of Expressway Widened Engineering Reinforced with Geotextile

2010 ◽  
Vol 152-153 ◽  
pp. 1166-1170
Author(s):  
Jin Long Liu ◽  
Jie Qun Liu ◽  
Lu Wang Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Lateral Displacement ◽  
High Stress ◽  
Failure Surface ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Stress Zone ◽  
The Stability ◽  
High Stress Zone

Based on nonlinear finite element method, the character of expressway widened engineering reinforced with geotextile is studied. It is found that the main vertical settlement, lateral displacement and failure surface of embankment occurred in the widened part of embankment. The lateral displacement decreased, the total incremental of displacement reduced and the stability of embankment enhanced when expressway widened engineering reinforced with geotextile. It also can be found that the axial force of geotextile get its maximal value at the intersection of old and new part of embankment, which is controlled by the differential settlement and normal stress mainly. In order to reinforce the embankment effectively, it is advised that the geotextile should be paved on high-stress zone.

Application of the Complex Variable Differential Method in the Back Analysis of Geotechnical Engineering

2010 ◽  
Vol 168-170 ◽  
pp. 2439-2444
Author(s):  
Ming Wei Liu ◽  
Ying Ren Zheng
Keyword(s):  
Shear Strength ◽  
Complex Variable ◽  
Back Analysis ◽  
Optimization Method ◽  
Differential Method ◽  
Analysis Method ◽  
Shear Strength Parameters ◽  
Strength Parameters ◽  
Measuring Point ◽  
The Stability

On the stability analysis of complex slope, the determination of rock-soil masses shear strength parameters is very important. It’s very necessary to use the back analysis method to verify experiment result of rock-soil masses parameters for the important slope engineering. Because the sensitivity of shear strength parameters to displacement parameters is very poor, so that we couldn’t get the satisfactory shear strength parameters result by traditional back analysis method. Aiming at the problems of traditional back analysis method, this paper puts forward a totally new method of back analysis, which is applicable to the shear strength parameters of rock-soil masses through the integration of complex variable differentiation method, optimization method and elastic-plasticity finite-element method. The method mathematically back calculates shear strength parameters of rock-soil masses on the basis of displacement of measuring point. The sample calculation result indicates that the method possesses high accuracy and searching efficiency, and is a method of back analysis of displacement deserving popularizing.

scholarly journals Dynamic Stability of Plane Free Surface of Liquid in Axisymmetric Tanks

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Siva Srinivas Kolukula ◽  
P. Chellapandi
Keyword(s):  
Free Surface ◽  
Parametric Instability ◽  
Nonlinear Finite Element ◽  
Linear Potential ◽  
Kutta Method ◽  
Nonlinear Finite Element Method ◽  
Time Step ◽  
Runge Kutta Method ◽  
Numerical Instabilities ◽  
The Stability

When liquid filled containers are excited vertically, it is known that, for some combinations of frequency and amplitude, the free surface undergoes unbounded motion leading to instability, called parametric instability or parametric resonance, while for other combinations the free surface remains plane. In this paper, the stability of the plane free surface is investigated theoretically when the vessel is a vertical axisymmetric container. The effect of coupled horizontal excitation on the stability is examined. The dynamics of sloshing flows under specified excitations are simulated numerically using fully nonlinear finite element method based on non-linear potential flow theory. A mixed Eulerian-Lagrangian technique combined with 4th-order Runge-Kutta method is employed to advance the solution in time. A regridding technique based on cubic spline is applied to the free surface for every finite time step to avoid possible numerical instabilities.

Numerical Analysis of Back Berm on Road Engineering with FEM

2013 ◽  
Vol 748 ◽  
pp. 1087-1090
Author(s):  
Jie Qun Liu ◽  
Dong Lin Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Lateral Displacement ◽  
Critical Value ◽  
Nonlinear Finite Element ◽  
Nonlinear Finite Element Method ◽  
Road Engineering ◽  
The Stability ◽  
Element Method

Based on nonlinear finite element method (FEM), the effect of back berm has been systematically studied. It is found that the lateral displacement of embankment could be reduced by back berm effectively, and the stability of embankment increased rapidly with the width of back berm enlarged. There is a critical value of width of back berm, that the stability of embankment is no more increased with the width of back berm enlarged than critical value.

scholarly journals Mechanism of Embankment Reinforced with Back Berm in Road Engineering

2014 ◽  
Vol 8 (1) ◽  
pp. 853-860
Author(s):  
Wang Qi-Hu
Keyword(s):  
Internal Friction ◽  
Lateral Displacement ◽  
Boundary Value ◽  
Friction Angle ◽  
Nonlinear Finite Element ◽  
Internal Friction Angle ◽  
Nonlinear Finite Element Method ◽  
Road Engineering ◽  
The Stability ◽  
Rock And Soil

Based on the nonlinear finite element method, the mechanism of embankment reinforced with back berm in road engineering reinforced has been studied. It is found there is almost no influence on the value of vertical settlement at the scope of original embankment by back berm. Only the vertical settlement under the location of back berm has been influenced lightly by back berm. The lateral displacement of embankment could be reduced or restrained by back berm. The stability of embankment enhanced when width of back berm enlarged. But the stability of embankment would not be increased any more when the width of back berm achieved its boundary value, so the width of back berm should not be bigger than the boundary value. The stability of embankment enhanced when the value of cohesion or internal friction angle of back berm increased. So rock and soil with big cohesion and internal friction angle should be used to fill back berm preferentially.

Sign in / Sign up

Export Citation Format

Share Document