Prefabricated cutoff wall of an earth dam

1993 ◽  
Vol 27 (11) ◽  
pp. 627-632
Author(s):  
A. A. Ravkin ◽  
I. I. Shekhtman
Keyword(s):  
Earth Dam ◽  
Cutoff Wall

The Applications of Concrete Cut-Off Wall in the Reinforcement of the Earth Dam

2010 ◽  
Vol 150-151 ◽  
pp. 749-752
Author(s):  
Jing Long Li ◽  
Shu Cai Li ◽  
Shu Chen Li
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Earth Dam ◽  
Elastic Model ◽  
Cutoff Wall ◽  
The Earth ◽  
Before And After ◽  
Coulomb Model ◽  
Explicit Finite Difference ◽  
Explicit Finite Difference Method

The concrete cutoff wall is a technology used in reinforcing sick dams more usually in recent years. In the text, the advanced FLAC3D method which is based on 3-D explicit finite difference method, is used to simulate a reinforcement of earth dam using concrete cutoff wall. Through the simulation, Mohr-Coulomb model, elastic model and Goodman element are used to analyse the distribution of the stress and the strain of the dam before and after reinforcement. Consequently, we can evaluate the unti-seepaging effect and raise the possible question.

scholarly journals Investigating the Influence of Penetration Length of Cut-off Wall on its Dynamic Interaction with Core and Foundation of Earth Dam

2018 ◽  
Vol 4 (12) ◽  
pp. 3019 ◽  
Author(s):  
Mehran Javanmard ◽  
Reza Mottaghi ◽  
S. M. Mir Mohammad Hosseini
Keyword(s):  
Numerical Study ◽  
Physical And Mechanical Properties ◽  
Earth Dam ◽  
Core Material ◽  
Length Variation ◽  
Cutoff Wall ◽  
Maximum Shear Strain ◽  
Penetration Length ◽  
The Core ◽  
Clay Core

Seepage and flow of water in the soil is one of the most important issue and effective elements in designing embankment dams. One of the methods to control seepage in alluvial foundation of earth dams is to use a plastic concrete cutoff-wall. For better seepage control, the cutoff-wall extends inside the clayey core as the one of common method of connection of cut-off wall and the core. Due to the stiffness difference of the core material and cutoff-wall, and also due to geological situation, physical and mechanical properties of rock and foundation, interaction of core and foundation with cut-off wall in different static and dynamic load cases is very considerable. Failure of cut-off wall occurs in cut-off wall and core joint.  So the study of their interaction, especially during an earthquake is very important. Karkheh dam cut-off wall with an area of about 150000 m2 is chosen for this study. FLAC software has been used to study the effect of cutoff-wall penetration length variation, inside the clay core of Karkheh earth dam under dynamic loading.  In numerical analysis of Karkheh earth dam model, all construction stages and seepage through dam are modelled. The model is first calibrated according to the results obtained from the dam instrumentations. After calibrating, according to available seismic studies of region, a suitable acceleration was selected and applied to the model. In this research, in order to find the optimum length, the effect of 0, 5, 10, 15 and 20 meters penetration length of cut-off wall in aforementioned conditions has been investigated. The results of the numerical study showed that the horizontal displacement and the maximum shear strain in the cutoff-wall is occurred adjacent to the clay core and the interface of core and foundation is a critical point for the cut-off wall, and also the stress in cut off wall joint increases with the elongation of penetration depth of the wall.

Determining the Appropriate Sealing Conditions through a Permeability and Groutability Evaluation: A Case Study of Sivaki Dam, Iran

2021 ◽  
pp. qjegh2020-124
Author(s):  
Mohammad Javad Kalantar Hormozi ◽  
Akbar Ghazifard ◽  
Zeinab Jorkesh
Keyword(s):  
Rock Mass ◽  
Grout Curtain ◽  
High Strength ◽  
Earth Dam ◽  
Geological Strength Index ◽  
Construction Site ◽  
Cutoff Wall ◽  
Lugeon Test ◽  
Asmari Limestone

The Sivaki Dam is an earth dam that is located near Yasuj city, 5.3 km northwest of Sepidar village. During excavations at the dam construction site, the high potential of water seepage from the foundation and its abutments has been proven. Some cavities and dissolution have been observed on both sides of the dam, suggesting the possibility of Karstification at greater depths. Most of the outcropping rocks in the study area comprise Asmari Limestone. These rock masses, despite their medium to high strength, have provided unfavorable conditions in terms of permeability and weathering. In this study, the foundation and both abutments of the dam were evaluated and analyzed to determine the permeability and groutability characteristics. To achieve this goal, the engineering characteristics of the rock mass of the construction site were examined by performing rock mass rating (RMR) and geological strength index (GSI) classifications. Moreover, the Lugeon test, secondary permeability index (SPI), rock quality designation (RQD), and monitoring hydraulic flows were used for this purpose. According to the results of this study, for abutments of the dam and in the case of alluvial substrates, grout curtain and the cutoff wall are respectively the best and most compatible methods available.

Challenges of Water Resource Development and Management in Zing Town, Taraba State, Nigeria

2015 ◽  
Vol 4 (1) ◽  
pp. 355-360
Author(s):  
E D Oruonye ◽  
E Bange
Keyword(s):  
Water Management ◽  
Water Supply ◽  
Water Resource ◽  
Resource Development ◽  
Economic Life ◽  
Earth Dam ◽  
Urban Water ◽  
Water Resource Development ◽  
Dug Wells ◽  
Development And Management

This study examined the challenges of water resource development and management in Zing town,Taraba State, Nigeria. The study considered issues of sources of water supply in Zing town, the nature of water challenges, impacts of the water challenges on the socio-economic life of the people, water management strategies and prospect of urban water resource development in the study area. 110 questionnaires were systematically administered in ten streets that were purposively selected in Zing town. The data were analyzed using descriptive statistics. The result of the finding indicates that majority (45.5%) of the respondent have their water source from borehole, 18.2% streams, 18.2% hand dug wells and 9.1% from other sources (mostly water vendors). The study shows that 68.2% of the respondents had their water point located outside their households, while only 31.8% claimed to have their water sources located within their compounds (this is mostly hand dug wells). The nature of water challenge in the area ranges from severe (50%), not severe (27.3%) and normal (22.7%). The results also shows that only 34% of respondents claimed to have access to sufficient water daily, while 66% of the respondents hardly have access to sufficient water on daily basis. The study shows that the water management strategy adopted mostly by the respondent ranges from storing water in large container (48.2%), reduce water use (29.1%), increase amount spent on water (13.6%) and others 9.1% (mainly re-use of water). The prospect of water resource development in the study area is very bright with the proposal of a small earth dam in Monkin settlement by the Federal Government of Nigeria. The Monkin small earth dam which is meant to generate 500KW of electricity can be integrated into an urban water supply project in the area. This will assure more reliable water supply all year round. It will also help to overcome some of the challenges of servicing the hand pumps which rendered them inadequate when they break down. This study recommends the need to replace the old and obsolete borehole equipment with new ones and increase the number of boreholes to meet the increasing water demand in the area.

Adsorption of Cadmium onto Sand-Attapulgite Cutoff Wall Backfill Media

2021 ◽  
Vol 232 (2) ◽  
Author(s):  
Wenbing Zhang ◽  
Wenbo Rao ◽  
Lei Li ◽  
Mark L. Brusseau ◽  
Ye Liu
Keyword(s):  
Cutoff Wall

Numerical and experimental modelling of seepage in homogeneous earth dam with combined drain

2021 ◽  
pp. 1-11
Author(s):  
Azam Kouhpeyma ◽  
Fouad Kilanehei ◽  
Mahmood Hassanlourad ◽  
Reza Ziaie-Moayed
Keyword(s):  
Earth Dam ◽  
Experimental Modelling

scholarly journals An investigation on dam settlement during and end of construction using instrumentation data and numerical analysis

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Behrang Beiranvand ◽  
Mehdi Komasi
Keyword(s):  
Numerical Analysis ◽  
Multivariate Regression ◽  
Initial Conditions ◽  
Horizontal Displacement ◽  
Behavioral Model ◽  
Critical Section ◽  
Earth Dam ◽  
Dam Construction ◽  
Good Match ◽  
Consolidation Settlement

AbstractIn the present study, using instrumentation data regarding vertical and horizontal displacement of the dam have been analyzed. Also, the largest and most critical section of the Marvak earth dam is modeled with the behavioral model of the Mohr–Coulomb by GeoStudio software. Numerical modeling of the dam has been done considering the actual embankment conditions and to analyze the changes of the immediate settlement during construction and the consolidation settlement just after construction and initial impounding. The outcomes of instrumentation and numerical analysis at the end of Marvak dam construction showed a settlement between 20 and 500 mm. The results show that the settlement will occur during the construction at the upper levels and the end of construction at the middle levels of the dam. By comparing observed and predicted data, multivariate regression and the explanation coefficient criterion (R2) was found to be R2 = 0.9579, which shows a very good correlation between observed and predicted data, and represents a good match for the settlement points and their location with the initial conditions of the design, and the behavior of the dam in terms of the settlement is found to be stable.

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