Anti-Seepage Evaluation of Reinforcement Effect for Fengchan Earth Dam

2017 ◽  
Vol 753 ◽  
pp. 290-294
Author(s):  
Ze Han Liu ◽  
Zhen Zhong Shen ◽  
Wen Wu Qing ◽  
Su Fan Xiong ◽  
Lei Gan
Keyword(s):  
Finite Element ◽  
Earth Dam ◽  
Earth Dams ◽  
Analysis Method ◽  
Reinforcement Effect ◽  
Seepage Analysis ◽  
Standard Requirement ◽  
Long Period ◽  
Before And After ◽  
Seepage Characteristics

Currently, there is a large amount of earth dams should be reinforced because of the running incessantly in a long period in our country. And the anti-seepage evaluation is an extremely critical and indispensable index to scrutinize the reinforcement effect of earth dam comprehensively. According to the real engineering conditions of the dam, the finite element seepage analysis method is used to compute the seepage characteristics in the Fengchan reservoir before and after the reinforcement in this paper. The results show that the effect of the anti-seepage system is well for adopting the concrete slope protection and concrete anti-seepage wall. The seepage state of foundation and dam body is improved evidently. The seepage gradient and seepage quantity of each material zone reduce significantly and meet the standard requirement of specification.

Stability Analysis of Earth Dam under Unsaturated Seepage

2008 ◽  
Vol 33-37 ◽  
pp. 1129-1134
Author(s):  
Zheng Hua Xiao ◽  
Bo Han ◽  
Akenjiang Tuohuti ◽  
Hong Jian Liao
Keyword(s):  
Stability Analysis ◽  
Unsaturated Soil ◽  
Limit Equilibrium ◽  
Earth Dam ◽  
Hydraulic Pressure ◽  
Earth Dams ◽  
Seepage Analysis ◽  
Unknown Quantity ◽  
The Stability ◽  
Unsaturated Seepage

This paper is mainly concerned with the saturated-unsaturated seepage analysis of earth dams based on unsaturated soil theory and the stability analysis of earth dams based on conception of slices. At first, beginning basic seepage theory, thesis introduce the saturated-unsaturated and steady-unsteady seepage differential equation of porous media and the FEM regarding hydraulic pressure head as basic unknown quantity. Then considering the shear strength of unsaturated soil, the method of analysis of general limit equilibrium has been approved and it can be used in the analysis of the stability of saturated-unsaturated slopes. Through an example it is respectively discussed effects of seepage flow when water head is changed in earth dam and the effects of percolation in the stability of the earth dam slope. Some helpful conclusions are gained. This can be making the best of the tow methods and the results can be used in engineering for reference.

Finite Element Analysis of Unsteady Seepage Flow through the Earth Dam of Huangbizhuang Reservoir

2012 ◽  
Vol 594-597 ◽  
pp. 1892-1896
Author(s):  
Er Xia Du ◽  
Jian Heng Sun
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Seepage Flow ◽  
Earth Dam ◽  
Earth Dams ◽  
The Finite Element Method ◽  
Element Analysis ◽  
The Earth ◽  
Flow Through

The unsteady seepage through earth dams is analyzed with the finite element method in this paper.Using this method, the seepage through Huangbizhuang earth dam is calculated. Many reasonable suggestions are posed to help the management and reinforcement of Huangbizhuang reservoir earth dam.

Finite Element Method Used in the Calculation of Earth-Rock Dam Seepage Reflections

2012 ◽  
Vol 546-547 ◽  
pp. 1598-1601
Author(s):  
Jing Hua ◽  
Hua Shu Yang
Keyword(s):  
Finite Element ◽  
Free Surface ◽  
Boundary Conditions ◽  
Earth Dam ◽  
Surface Boundary ◽  
Seepage Analysis ◽  
Finite Element Software ◽  
The Earth ◽  
Surface Boundary Conditions ◽  
Finite Element Calculations

This paper analyzes the problems which exist in finite element calculations of the earth dam seepage which is free surface solution, cell subdivision improper, the transformation of the free surface boundary conditions and the permeability coefficient values at the interface of different materials, boundary conditions and other issues. Put forward the corresponding solution. Applies common general finite element software to calculate the seepage. Works in conjunction with a stable levee seepage analysis and get better results.

Silt Embankment Reinforced by Sleeve Valve Barrel Fracturing Grouting

2012 ◽  
Vol 178-181 ◽  
pp. 1209-1212 ◽  
Author(s):  
Deng Yuan Zhu ◽  
Qing Tao Zhang
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Comparative Analysis ◽  
Numerical Model ◽  
Experimental Research ◽  
Reinforcement Effect ◽  
Construction Methods ◽  
Before And After ◽  
Displacement Force

Abaqus finite element method and experimental study are carried out to research the silt embankment reinforced by sleeve valve barrel fracturing grouting method. Numerical model is determined based on the construction methods and mechanism, the calculation parameters are determined by experimental research. The displacement, force, and plastic are analyzed through comparative analysis of safety factor of attenuated embankment before and after reinforcement. The results show that the Reinforcement effect of sleeve valve barrel fracturing grouting method to stability attenuated roadbed is remarkable.

scholarly journals Numerical investigation into the stability of earth dam slopes considering the effects of cavities

2019 ◽  
Vol 37 (4) ◽  
pp. 1397-1421
Author(s):  
Hawraa Alateya ◽  
Alireza Ahangar Asr
Keyword(s):  
Finite Element ◽  
Vertical Direction ◽  
Simulation Models ◽  
Horizontal Direction ◽  
Earth Dam ◽  
Earth Dams ◽  
Content Type ◽  
Finite Element Software ◽  
Stability Of Slopes ◽  
The Stability

Purpose This study is an attempt to estimate the influence of the presence of cavities on the stability of slopes in earth dams under rapid drawdown conditions. The purpose of this paper is to study the influence of different factors, such as the diameter and location of cavities, in addition to their existence effects. Design/methodology/approach A series of finite element simulation models were developed using PLAXIS 2D finite element software to analyse the stability of slopes in earth dams while considering various effects from cavities in the subsoil under rapid drawdown conditions. Findings The results indicated that the presence of cavities and an increase in the diameter of cavities decreased the stability of the upstream face dramatically for all examined locations in a horizontal direction; however, this effect was less on the downstream side. The results also showed that variations in the location of cavities in the horizontal direction have a greater effect on the stability than those in the vertical direction. The results revealed that increasing shear strength parameters of embankment does not reduce the influence of cavities on stability when those cavities are in critical locations. Originality/value A numerical model has been developed to simulate the effects of cavities on the stability of slopes in water-retaining structures/earth dams. The stability of earth dam slopes on upstream and downstream sides under rapid drawdown conditions considering various cavity effects, including their existence, diameter and location, were numerically analysed.

scholarly journals Seepage Behavior of an Inclined Wall Earth Dam under Fluctuating Drought and Flood Conditions

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Wei Ye ◽  
Fuheng Ma ◽  
Jiang Hu ◽  
Ziyang Li
Keyword(s):  
Large Scale ◽  
Flow Behavior ◽  
Soil Surface ◽  
Seepage Flow ◽  
Earth Dam ◽  
Soil Permeability ◽  
Seepage Analysis ◽  
Practical Engineering ◽  
Seepage Characteristics ◽  
Engineering Projects

Most dam seepage safety analyses evaluate a stable seepage field, infiltration line, and seepage flow. However, under fluctuating drought-flood conditions, the soil surface becomes cracked, making it too complicated to conduct a routine seepage analysis. In this paper, the seepage characteristics of an inclined wall dam under fluctuating drought-flood conditions were studied using a large-scale physical model. The results show that after drought, the permeability coefficient of clay with low crack development was smaller than that of the saturated permeability, but for cracked areas, with high permeability, permeability coefficients were much larger than those of the saturated permeability. As the water level rose, cracks could heal themselves, but this healing was superficial, and the soil could no longer return to its predrought state. After crack healing, the integrity of the dam slope was much less than its original state. In addition, the formation of cracks increased the porosity of the soil and changed the soil permeability, which permanently weakened the antiseepage performance of the clay soil. This study evaluated the seepage flow behavior of an inclined wall dam under fluctuating drought-flood conditions, and results can be used to monitor and protect the weak parts of seepage dams in practical engineering projects.

ANALISIS PENGARUH PEMBANGUNAN JALAN LAYANG JANTI TERHADAP PERKEMBANGAN TATA RUANG KAWASAN JANTI STUDI KASUS : KAWASAN JANTI, DESA CATURTUNGGAL, KABUPATEN SLEMAN, D. I. YOGYAKARTA

2017 ◽  
Vol 11 (3) ◽  
pp. 255
Author(s):  
Jeky El Boru
Keyword(s):  
Road Network ◽  
Open Space ◽  
Qualitative Description ◽  
Analysis Method ◽  
Open Spaces ◽  
The Road ◽  
Before And After ◽  
Linkage Method ◽  
The Impact ◽  
Parking Place

Abstract: This research aims to analyze the impact of Janti Flyover Construction toward the growth of layout at Janti Urban Area, including structured space, open space, and linkage. Method used for data collecting are observation, air photograph monitoring, and interview, whereas the analysis method is qualitative description, which is the superimposed method of two layers, that are the layout condition before and after flyover construction. The result shows that the impact of Janti Flyover construction can be seen on building mass (solid), the increasing number of open spaces, including the road network, parking place, and park, whereas the relation between spaces, visually and structurally, can be seen on the growth of buildings which have new shapes and styles, therefore the performance of the overall building does not have a proportional shape. Considering Janti Street at the collective relation, its role is getting stronger as the main frame road network.Keywords: Flyover construction, layout changing, Janti AreaAbstrak: Penelitian ini bertujuan untuk menganalisis pengaruh pembangunan Jalan Layang Janti terhadap perkembangan tata ruang Kawasan Janti, meliputi ruang terbangun, ruang terbuka, serta hubungan antar ruang (“linkage”). Metode pengumpulan data dilakukan melalui observasi, pengamatan foto udara, dan wawancara; sedangkan metode analisis melalui deskripsi secara kualitatif yang berupa “superimposed method” dari dua lapisan kondisi lahan, yakni kondisi tata ruang sebelum dan sesudah pembangunan jalan layang. Hasil penelitian menunjukkan bahwa pengaruh pembangunan Jalan Layang Janti terdapat pada massa bangunan (“solid”), pertambahan ruang terbuka yang berupa jaringan jalan, parkir, dan taman; sedangkan pada hubungan antar ruang ̶ secara visual dan struktural ̶ yakni tumbuhnya bangunan dengan bentuk dan gaya baru, sehingga bentuk tampilan bangunan secara keseluruhan tidak proporsional. Pada hubungan kolektif, Jalan Janti semakin kuat perannya sebagai kerangka utama jaringan jalan.Kata kunci : Pembangunan jalan layang, tata ruang, Kawasan Janti

Print Media and the Political Reform in Ethiopia

2019 ◽  
Vol 14 ◽  
pp. 3356-3371
Author(s):  
Negesse Gessese
Keyword(s):  
Social Changes ◽  
Analysis Method ◽  
Sources Of Information ◽  
Attribution Of Responsibility ◽  
Societal Issues ◽  
Content Selection ◽  
Period 2 ◽  
Content Analysis Method ◽  
Before And After ◽  
Issue Frames

This research examines the agenda and frames used by the Reporter newspaper editorial coverage of issues and actors before and after the reform in Ethiopia. The study applies a quantitative content analysis method and examined 99 (Period 1 = 57 and Period 2 = 42) editorials in all periods. The source of data and the period of data collection were purposely selected. The results indicated that societal issues, government, and party issues were frequent in both periods. The professional journalist was the only Author in both periods. More government criticism and more reforms were mentioned before the reform. Compared with editorials published before and after the reform, noticeable changes were observed in government critique, attribution of responsibility frames, human interest frames and economic issue frames. However, content selection, sources of information, mentioned reforms, conflict relationship frames, and ideological frames didn’t have relationship with the date of publication. Finally, the Reporter editorials coverage did change significantly in many respects, although it is difficult to determine the causes of the changes—economic factors, reduced political control, social changes or globalization forces.

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