Sökning: "embankment dam"
Visar resultat 1 - 5 av 19 avhandlingar innehållade orden embankment dam.
1. Resistivity investigation and monitoring for detection of internal erosion and anomalous seepage in embankment dams
Sammanfattning : Methods for monitoring seepage and detecting internal erosion are essential for the safety evaluation of embankment dams. Internal erosion is one of the major reasons for embankment dam failures, and there are several tenths of thousands of large embankment dams in the world. LÄS MER
2. Investigation of Suffusion in Glacial Till Dam Cores : Testing methods and critical hydraulic gradients
Sammanfattning : There are 10 000 dams in Sweden of varying size, age and type, being water retention and tailing dams the two major type of dams. About 2000 of the water retention dams belong to hydropower operations, out of which 190 are classified internationally as large dams (higher than 15m). LÄS MER
Sammanfattning : Internal erosion, which is one of the major reasons forembankment dam failure, causes an increased seepage flow due toloss of fines. A seepage measuring system is therefore a vitalpart of an embankment dams monitoring system. Manyexisting seepage monitoring systems are not however sensitiveenough to detect small changes in the seepage flow. LÄS MER
Sammanfattning : The finite element method (FEM) has been widely used to analyse earth and rockfill dams. In a finite element analysis a proper constitutive model has to be chosen for each part of the dam in order to simulate the relation between stresses and strains. The zones of an earth and rockfill dam have different functions. LÄS MER
Sammanfattning : Suffusion, also called internal instability, is an internal erosion mechanism that occurs in embankment dams when fine-grained particles are washed out of the core soil matrix by seepage. Initiation of internal erosion depends mainly on three major factors: grain size distribution of the soil, stress conditions and hydraulic load; whilst its continuation depends of the filter properties. LÄS MER