Global ETD Search
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Showing 1 to 14 of 14 for “"Internal Erosion"”.
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Hydromechanical Stress and Internal Erosion under Earthen Structures
<p>"Dam failures by seepage and internal erosion have reportedly been attributed to up to 40% of all dam failures in the United States. Backwards piping erosion either through the embankment or foundation soils has been reported to be the major contributing method to seepage and internal erosion …
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Critical gradient for internal erosion in earthen d ams : a comparative analysis of two predictive methodologies
Minimizing the uncertainty in predicting the critical gradient of a dam (i.e. the critical reservoir pool level) is important during the risk analysis of dams. Uncertainty leads to inexact relative risk in portfolio management; therefore it is essential to get as accurate a risk estimation as …
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A Study on the Long-Term Performance of Seepage Barriers in Dams
… the catalyst for initiation of several modes of internal erosion that were either unlikely or less likely without the seepage barrier. As a consequence, seepage barriers give rise to the potential for additional mechanisms of internal erosion and piping in the dam and the foundation. Mechanisms …
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Geoelectric monitoring of seepage in porous media with engineering applications to earthen dams
… is developed for investigating seepage and internal erosion in earthen dams with time-lapse measurements of self-potential anomalies associated with conservative salt and non-conservative heat tracer migration in the subsurface. The method allows for 1) detecting seepage zones in earthen …
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Laboratory Investigations of the Mechanisms of Groundwater Seepage Erosion and Piping in Cohesive Soils
… are two mechanisms that can cause streambank erosion and failure. Groundwater seepage can cause erosion either by undercutting or "pop-out" failure. The objective of the seepage study was to utilize a constant-head soil box packed with sandy loam soils at prescribed bulk densities (1.30-1.70 …
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The underscour of rubble mound breakwaters by wave action
… Many failures have been attributed to internal erosion whereby beach materials are removed by percolating water, such as that due to water waves and surface run-off. Washing-out of the backfills, settlement of the main structure and overtopping of the subsequent waves will follow …
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Seepage monitoring and diagnosis of distresses in an earth embankment dam using probability methods
… consequences. Considering seepage and internal erosion are accounted as one of the major causes of failure in earth embankment dams, it is essential to detect any concentrated seepage and sources of distress at early stages. A number of investigation and monitoring methods exist for the …
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DESIGN METHODS FOR PRESSURE RELIEF WELL SYSTEMS AT DAMS AND LEVEES
… water pressures that can compromise them via internal erosion. The U.S. Army Corps of Engineers (USACE) analytical method to design relief well systems by calculating discharge and excess head along an infinite line of wells was developed from the 1930s – 1950s. The research presented here …
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Electrical Resistivity Tomography (ERT) and electromagnetic (CMD) assessment of Scottish reservoir embankments
… of the top clay layers that could lead to erosion and slip surface with overtopping water. In most cases the failure of flood embankments causes flooding risk to local areas and puts inhabitants at risk. For this reason it is important to investigate the condition of the embankments and …
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Dross : re-genesis of diverse matter : a design post-praxis
… condition, derivative of the urban system's internal erosion. Since it is impossible to dispose of these objects due to their extremely high-embodied material energy, this thesis lies on the premise of their 'architectural' reuse and the development of post-praxis design strategies. The …
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Finite element analysis of embankment dam due to rapid drawdown events
… potential failure modes (which range from internal erosion to overtopping) slope instabilities can be triggered by changing boundary conditions associated with flood loading or rapid drawdown (RDD) conditions. The assessment of slope stability under RDD conditions is difficult to estimate …
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Probabilistische Modellierung von Versagensprozessen bei Staudämmen
… modes which are formulated as outcomes of internal and external hazards. These modes are mathematically based on analytical, empirical and numerical approaches. The four external hazards hydrological events, seismology, landslides into the reservoir and the failure of an upstream dam allow …
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Forward modelling and inversion of streaming potential for the interpretation of hydraulic conditions from self-potential data
… of the self-potential method in detecting internal erosion. Maximum self-potential anomalies are shown to be linked to large localized hydraulic gradients that develop in response to piping, prior to any detectable increase in seepage flow through the dam. A linear inversion algorithm is …
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Integrity Assessment Of Earthen Dams And Levees Using Cross-Plot Analysis Of Seismic Refraction And Electrical Resistivity Tomograms
… compromised location, such as an air void due to internal erosion or seepage. Therefore, there is uncertainty involved with using geophysical methods where an anomaly does not necessarily represent a true compromised zone. Identification of true compromised zones requires an invasive geotechnical …