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.

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.

Numerical analysis of the anti-seepage measures for high earth rockfill dam on deep overburden

2012 ◽  
Vol 170-173 ◽  
pp. 1872-1877 ◽  
Author(s):  
Jun Yan ◽  
Si Hong Liu ◽  
Bin Zhou
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Seepage Field ◽  
Seepage Analysis ◽  
The Real ◽  
Rockfill Dam ◽  
The Stability ◽  
High Rockfill Dam ◽  
At Home

The anti-seepage measures of a high earth rockfill dam built on the foundation with a deep overburden affects the stability and safety of the dam greatly. Nowadays there are few researches on this area both at home and abroad. On the basis of the finite element seepage analysis of the Pubugou high rockfill dam in which core walls and two cut-off walls are designed as the anti-seepage measures, the real seepage behavior of the seepage field is obtained in this paper, as well as the seepage characters of the seepage field under different arrangements of the cut-off walls. The conclusions have a certain referential value for the design of the anti-seepage measures for the similar projects with the foundation of a deep overburden.

scholarly journals Numerical simulation of slope stability of the abandoned dreg site

2021 ◽  
Vol 233 ◽  
pp. 01062
Author(s):  
Xiao Wang ◽  
Zhigang Deng ◽  
Dong Ni ◽  
Dong Zhang ◽  
Jing Zhao
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Slope Stability ◽  
Rainfall Infiltration ◽  
Seepage Field ◽  
Stability Coefficient ◽  
Safety Coefficient ◽  
Rainfall Process ◽  
The Stability

A mathematical model of No. 1 abandoned dreg site of the newly-built highway from Xiangle village, Pingyao County to Hougou village, Qinyuan County was developed using GeoStudio software. The stability of the abandoned dreg site was simulated and analyzed under rainstorm. As a result, the influence of rainfall infiltration on slope seepage field is not limited to the rainfall process. The slope stability coefficient decreases significantly during the rainfall and the decreases slightly after the rainfall stopped due to continuous rainwater seepage. The minimum safety coefficient is 2.292 at 24h, greater than the allowable value, which demonstrates that the slope is stable.

Numerical Simulation of Fractured Rock Slope with Shear-Slip Behavior

2014 ◽  
Vol 548-549 ◽  
pp. 673-677
Author(s):  
Qin Gao ◽  
Gui He Wang
Keyword(s):  
Numerical Simulation ◽  
Rock Slope ◽  
Pore Water Pressure ◽  
Fractured Rock ◽  
Water Pressure ◽  
Analysis Method ◽  
Element Simulation ◽  
Slip Planes ◽  
Shear Slip ◽  
The Stability

The development of shear-slip cracks and motion trend of fracture water were presented for discussing the shear-slip behavior and analyzing the stability of fractured rock slope under hydraulic action. Seepage behavior of epigenetic cracks and the positions of slip or collapse were also investigated by monitoring pore water pressure using DEM. The analysis method of discrete element simulation for fractured rock slope was proposed. The results of numerical simulation indicated that interpenetrating fractures are more likely to be slip planes.

Numerical Simulation of Seepage Field of Tailing Water Channel in Construction Period of Coupling Fields of Stress and Seepage

2014 ◽  
Vol 919-921 ◽  
pp. 1240-1243 ◽  
Author(s):  
Guo Xin Yan ◽  
Wei Wu ◽  
De Jun Zhao
Keyword(s):  
Numerical Simulation ◽  
Water Channel ◽  
Mathematic Model ◽  
Soil Mass ◽  
Hydraulic Gradient ◽  
Seepage Field ◽  
Construction Period ◽  
Engineering Measures ◽  
Channel Slope ◽  
Rock And Soil

On the basic of rock and soil mass mathematic model, with the boundary conditions of classic section, the seepage field in construction period is simulated. Some conclusions are drawn: the hydraulic gradient of the channel slope where the seepage spills out exceeds the allowable hydraulic gradient and some engineering measures are needed to avoid seepage damage; hydraulic gradient on rock base is less than the allowable hydraulic gradient and the seepage is safe.

scholarly journals A Chaotic Oscillator Based on Meminductor, Memcapacitor, and Memristor

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Xingce Liu ◽  
Xiuguo Bi ◽  
Huizhen Yan ◽  
Jun Mou
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
State Transition ◽  
State Equation ◽  
Chaotic Oscillator ◽  
Hyperchaotic System ◽  
Analysis Method ◽  
Numerical Simulation Result ◽  
Dynamical Characteristics ◽  
The Stability

In this paper, a hyperchaotic circuit consisting of a series memristor, meminductor, and memcapacitor is proposed. The dimensionless mathematical model of the system is established by the state equation of the circuit. The stability of equilibrium point of the system is analyzed by using the traditional dynamic analysis method. Then, the dynamical characteristics of the chaotic system with parameters are analyzed in detail. In addition, the system also has some particular phenomena such as attractor coexistence and state transition. Finally, the circuit is realized by DSP, and the result is consistent with that of numerical simulation. This proves the accuracy of the theoretical analysis. Numerical simulation result shows which hyperchaotic system has very abundant dynamical characteristics.

The Numerical Simulation of Effect of Parameters for Bolts on Slope Stability

2013 ◽  
Vol 353-356 ◽  
pp. 84-88 ◽  
Author(s):  
Tao Li ◽  
Ling Zeng ◽  
Fang Guo
Keyword(s):  
Numerical Simulation ◽  
Safety Factor ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Analysis Method ◽  
Standard Requirement ◽  
Stability Of Slope ◽  
The Stability ◽  
Bolt Spacing ◽  
Engineering Personnel

In order to analyze the influence of bolt supporting parameters on the stability of slope, based on the limit equilibrium method to establish model of slope and calculated the safety factor of slope. Research shows that: (1) As the bolt length increases, the safety factor of slope increases gradually, then the length of anchor bolt can be used as the design length when the safety factor can meet the standard requirement.(2) With the increase of the anchor Angle, the safety factor of slope present the trend of first increasing and then decreasing, when bolt spacing increased to a certain value, the safety factor of slope reduce significantly.(3)In this paper, the analysis method of slope bolting parameters on its effect to the stability is simple and strong operational, which can provide a reference for related engineering personnel.

Numerical Simulation Analysis on a Construction Method of Ultra-Closing Over-Cross Transportation Tunnels

2011 ◽  
Vol 261-263 ◽  
pp. 1287-1291
Author(s):  
He Ran Yu ◽  
Xiao Jun Zhou ◽  
Xiao Bo Wang
Keyword(s):  
Numerical Simulation ◽  
Mechanical Behavior ◽  
Simulation Analysis ◽  
Construction Method ◽  
Simulation Approach ◽  
Construction Period ◽  
New Construction ◽  
The Stability ◽  
Close Distance

By numerical simulation approach, this paper analyzed a new construction method for over-cross tunnel. In this method one concrete framework and two connecting walls were used in the intersection zone to meet the requirement of ultra-close distance between the two tunnels: the lining of upper tunnel rode through on the lower one’s via two connecting walls. This paper conducted a series of study on the mechanical behavior of rocks and structures during the construction period. The stability of the structure and the feasibility of construction method were evaluated.

ESTIMATION OF TECHNICAL, SPECIALIZED AND ECONOMIC EFFICIENCY OF CULTIVATED POTATO VARIETIES USING DATA ENVELOPE ANALYSIS METHOD (DEA) IN IRAQ FOR SPRING LUG 2018

2020 ◽  
pp. 119-131
Keyword(s):  
Technical Efficiency ◽  
Economic Efficiency ◽  
Potato Crop ◽  
Economic Status ◽  
Analysis Method ◽  
Envelope Analysis ◽  
Variable Capacity ◽  
Data Envelope Analysis ◽  
Using Data ◽  
The Stability

Research highlights the importance of potato crop, which occupies a prominent food and economic status in food security besides rice, wheat and corn at the local and global level. Despite the expansion of the cultivation of potato crop in Iraq in general and Ameriyah district in particular However, potato productivity remains substandard, this may be due to a lack of knowledge of the most efficient varieties and not to use productive resources at the levels at which technical, specialized and economic efficiency is achieved. Therefore, the aim of the research is to determine the technical, specialized and economic efficiency according to the cultivated seed category. The data envelope analysis (DEA) method was used to estimate technical, specialized and economic efficiency, assuming constant and variable capacity returns. As a result of the study, the Safrana variety achieved the highest average technical efficiency according to the stability of the yield and capacity efficiency in addition to achieving the highest average specialized and economic efficiency, The Lapadia variety achieved the highest average technical efficiency, assuming that capacity returns have changed. Therefore, we recommend the adoption of items that achieve higher efficiency and the need to redistribute the elements of production better and Achieving the optimum levels at which technical, specialized and economic efficiency is achieved and saving what has been wasted.

Sewer System for Improving Flood Control in Tokyo: A Step towards a Return Period of 70 Years

1994 ◽  
Vol 29 (1-2) ◽  
pp. 303-310 ◽  
Author(s):  
Kazuyuki Higuchi ◽  
Masahiro Maeda ◽  
Yasuyuki Shintani
Keyword(s):  
Return Period ◽  
Flood Control ◽  
Rainfall Intensity ◽  
Runoff Coefficient ◽  
Large Drop ◽  
Construction Costs ◽  
Sewer System ◽  
Construction Period ◽  
Metropolitan Government ◽  
Under Construction

The Tokyo Metropolitan Government has planned future flood control for a rainfall intensity of 100 mm/hr, which corresponds to a return period of 70 years, and a runoff coefficient of 0.8. Considering that the realization of this plan requires a long construction period and high construction costs, the decision was made to proceed by stages. In the first stage, the improvement of the facilities will be based on a rainfall intensity of 75 mm/hr (presently 50 mm/hr), corresponding to a return period of 17 years, and a runoff coefficient of 0.8. In the next stage the facilities will be improved to accommodate a rainfall intensity of 100 mm/hr. In the Nakano and Suginami regions, which suffer frequently from flooding, the plan of improvement based on a rainfall intensity of 75 mm/hr is being implemented before other areas. This facility will be used as a storage sewer for the time being. The Wada-Yayoi Trunk Sewer, as a project of this plan, will have a diameter of 8 m and a 50 m earth cover. This trunk sewer will be constructed considering several constraints. To resolve these problems, hydraulic experiments as well as an inventory study have been carried out. A large drop shaft for the trunk sewer is under construction.

Sign in / Sign up

Export Citation Format

Share Document