Earth Dam / Levees
PROBLEM
Earth dam failure is an important issue engineers must consider during reservoir filling. Factors such as internal erosion and piping occurrences caused by seepage can lead to dam failure, resulting in a disaster. The initial slope stability of earth dams and levees must also be performed such that the risk of slope failures is minimized.
SOLUTION
The complete solution for the analysis of earth dams and levees involves a number of related numerical analyses. The most prevalent of these are:
 Slope stability analysis
 Seepage analysis


SVSLOPE is the most comprehensive tool currently available for the analysis of levee stability. It analyzes slope stability from a stressbased or limit equilibrium approach and implements advanced features such as:
 3D analysis of slope stability and seepage
 Mesh refinement to handle zones of high gradient
 Advanced probabilistic analysis with the APEM method
 Combined seepage and slope stability analysis possible using SVSLOPE and SVFLUX
 Rapid drawdown by the total (Duncan 3stage), or effective stress method
 Most advanced representation of the upstream seepage boundary condition
Seepage analyses (SVFLUX) are an important tool for assessing the possibility of seepage failure in dams and studying hydraulic conditions for then calculating the stability of earth dams. SVSLOPE may be used to calculate the stability of levees and earth dams under unsaturated conditions, with fluctuating water tables, and under rapid drawdown scenarios. The stresses (and potential deformations) encountered in earth dams may also be modeled using the SVSOLID software. Finite element scenarios may be evaluated in 2D or 3D.
Please note that most of these models can be downloaded through our SVOffice product suite.
Additional Articles

 Earth Dam RDD DeepPerviousFoundation ChimneyBlanketDrain 
SoilVision Systems Ltd. is pleased to announce the addition of new distribution models which simulate situations described in the Engineering and Design Manual for Coal Refuse Disposal Facilities which is distributed by the Mine Safety and Health Administration (MSHA). The models were developed in order to facilitate the training of mining companies on the use of the SVOffice software in this industry. The models represent typical situations and design scenarios outlined in the design manual for the construction of earth dams for containment facilities.
Model filename: MSHA > Earth Dam RDD DeepPerviousFoundation ChimneyBlanketDrain.svm
Tags: MSHA,Earth Dam / Levees,MSHA,SteadyState,2D,SVSLOPE,Slope Search,Water Table
 mica4 
Step 4  phased geometry slope stability
Model filename: Slopes_Group_3 > mica4.svm
Tags: Slopes_Group_3,SVSLOPE,2D,SteadyState,Grid and Tangent,Earth Dam / Levees,Water resources management,Infrastructure,Slopes_1/2/3/SAFE
 RapidDrawdownEffective 
Rapid drawdown and slope stability
Model filename: Slopes_Group_3 > RapidDrawdownEffective.svm
Tags: Slopes_Group_3,SVSLOPE,SVFLUX,2D,Transient,Water Table,Slope Search,Rapid Drawdown,Earth Dam / Levees,Water resources management,Infrastructure,Slopes_1/2/3/SAFE
 RDD01 
Apply actual rapid drawdown using the Duncan (1990) threestage approach.
Model filename: Slopes_Group_3 > RDD01.svm
Tags: Slopes_Group_3,SVSLOPE,2D,SteadyState,Water Table,Fully Specified,Earth Dam / Levees,Rapid Drawdown,Water resources management,Infrastructure,Slopes_1/2/3/SAFE,Benchmarking
 RDD_Pumped_Storage_Project_Dam 
The Pumped Storage Project Dam has a densely compacted, silty clay core. The lower portion of the upstream slope is a zone of random materials with the equivalent of the same strength properties as the core. The upper portion of the upstream slope and all of the downstream slope is a free draining rock fill. For the rapid drawdown analysis the water level is lowered from 545 feet to 380 feet.
The Duncan 3Stage Rapid Drawdown Analysis method is used in SVSlope to solve this model. The implementation of the method is based on the theory presented by Duncan, Wright, and Wong (1990).
Model filename: Slopes_Group_3 > RDD_Pumped_Storage_Project_Dam.svm
Tags: Slopes_Group_3,SVSLOPE,2D,SteadyState,Water Table,Grid and Point,Earth Dam / Levees,Rapid Drawdown,Water resources management,Infrastructure,Slopes_1/2/3/SAFE,Benchmarking
 RDD_Pumped_Storage_Project_Dam_3D 
The Pumped Storage Project Dam has a densely compacted, silty clay core. The lower portion of the upstream slope is a random zone with the same strength properties as the core. The upper portion of the upstream slope and all of the downstream slope is a free draining rockfill. The rapid drawdown analysis water level is from 545 feet to 380 feet (Duncan, Wright and Wong, 1990).
The analysis methods used for the study of this model are: Bishop, Corps#2, Spencer, MP (Intercolumn Force Function  Constant), GLE (Intercolumn Force Function  Constant), and Sarma (Intercolumn Force Function  Halfsine).
The search method for the critical slip surface is " Grid and Tangent". The grid and tangent methodology is one of the most common methods of determining the critical circular slip surface. In this methodology, the trial slip surfaces are specified by a grid of centers and a set of lines to which the circular slip surface must be tangent.
Model filename: Slopes_3D > RDD_Pumped_Storage_Project_Dam_3D.svm
Tags: Slopes_3D,SVSLOPE,3D,SteadyState,Water Table,Water resources management,Earth Dam / Levees,Earth structures,Slopes_3D
 RDD_USACE 
Duncan 3Stage Rapid Drawdown Analysis. Published in Corps of Engineers (2003), engineering Manual. Hand calculation = 1.44 (Bishop).
Model filename: Slopes_Group_3 > RDD_USACE.svm
Tags: Slopes_Group_3,Benchmarking,Earth Dam / Levees,Water resources management,Rapid Drawdown,Fully Specified,Water Table,SteadyState,2D,SVSLOPE
 RDD_USACE_3D 
This model represent the Duncan 3stage rapid drawdown analysis which was published in Corps of Engineers (2003).
The analysis methods used for the study of this model are: Bishop, Corps#1, Corps#2, Spencer, MP (Intercolumn Force Function  Halfsine), GLE (Intercolumn Force Function  Halfsine),and Sarma (Intercolumn Force Function  Halfsine).
The search method for the critical slip surface is "Fully Specified  Ellipsoid" which allows the specification of an elliptical slip surface. The fully specified method implies that the analyzed slip surface is fully defined. Fully Specified method allows the user to specify the centerpoint as well as the tangent plane and aspect ratio of the ellipsoid to define the ellipse.
Model filename: Slopes_3D > RDD_USACE_3D.svm
Tags: Slopes_3D,Water Table,SteadyState,3D,Slopes_3D,Earth structures,SVSLOPE,Benchmarking,Earth Dam / Levees,Water resources management
 RDD_WalterBouldinDam 
Duncan 3Stage Rapid Drawdown Analysis. Duncan, Wright and Wong (1990). HWalter Bouldin Dam. Published FOS = 1.04 (after Duncan, Wright and Wong, 1990)
Model filename: Slopes_Group_3 > RDD_WalterBouldinDam.svm
Tags: Slopes_Group_3,SVSLOPE,2D,SteadyState,Water Table,Grid and Line,Earth Dam / Levees,Rapid Drawdown,Water resources management,Infrastructure,Slopes_1/2/3/SAFE,Benchmarking
 ReservoirFilling 
Simple example illustrating reservoir filling.
The analysis methods used in this study are: Spencer, MP (Interslice Force Function  Halfsine), and GLE (Interslice Force Function  Halfsine).
The search method for the critical slip surface is " Grid and Tangent". The grid and tangent methodology is one of the most common methods of determining the critical circular slip surface. In this methodology, the trial slip surfaces are specified by a grid of centers and a set of lines to which the circular slip surface must be tangent. The critical slip surface is considered to be circular.
Model filename: Slopes_Group_3 > ReservoirFilling.svm
Tags: Slopes_Group_3,combined,filling,reservoir,SVSLOPE,SVFLUX,2D,Transient,Water Table,Grid and Tangent,Earth Dam / Levees,Water resources management,Infrastructure,Slopes_1/2/3/SAFE
 VS_19_NonCircular 
This model consists of a layered slope without porewater pressures and also an earth dam type structure with three underlying soil layers.
The analysis method used in this study is: Spencer.
The search method for the critical slip surface is "Greco Search" which is in fact a random method. The critical slip surface is considered to be noncircular.
Model filename: Slopes_Group_1 > VS_19_NonCircular.svm
Tags: Slopes_Group_1,Slope Group 1,SVSLOPE,2D,SteadyState,Greco Search,Earth Dam / Levees,Water resources management,Infrastructure,Slopes_1/2/3/SAFE,Benchmarking,Earth structures
 VS_34_Monte 
Cannon Dam Model This model is designed for the calculation of the factor of safety for the Cannon Dam.
The analysis methods used for studying this model are: Spencer, and GLE(Interslice Force Function  Halfsine).
The search for the critical slip surface is fully specified and the critical surface shape is circular. The fully specified method allows the user to completely specify the geometry of the analyze slip surface. This method is particularly useful for a back analysis in which the location of the slip surface is well known. The surface is defined by defining the center coordinates and radius of the critical surface.
Model filename: Slopes_Group_1 > VS_34_Monte.svm
Tags: Slopes_Group_1,SVSLOPE,2D,SteadyState,Probability,Fully Specified,Slope Group 1,Infrastructure,Slopes_1/2/3/SAFE,Benchmarking,Earth structures,Earth Dam / Levees
 VS_35_1_Fig.7_SurfaceA 
The purpose of this verification model is to look at duplicating reliability index results for several circular failure surfaces.
The analysis method used for studying this model is: Bishop.
The search for the critical slip surface is fully specified and the critical surface shape is circular. The fully specified method allows the user to completely specify the geometry of the analyze slip surface. This method is particularly useful for a back analysis in which the location of the slip surface is well known. The surface is defined by defining the center coordinates and radius of the critical surface.
Model filename: Slopes_Group_1 > VS_35_1_Fig.7_SurfaceA.svm
Tags: Slopes_Group_1,SVSLOPE,2D,SteadyState,Probability,Fully Specified,Slope Group 1,Earth Dam / Levees,Probabilistic,Water resources management,Infrastructure,Slopes_1/2/3/SAFE,Benchmarking,Earth structures,Groundwater
Back to Gallery 