Displacements And Cracks In The Soil Of Clay Core And The Methods Of Crack Closing.

الملخص

Historical records of dam failures determined that  46% of  these failures were due to piping, where the filters were either inadequate or not present.

Filter is important part in an embankment dam because it is critical in protecting the core (often clay) against erosion. A proper filter is also able to control and seal unfavorable cracks that may occur through the impermeable core.

Among all of the methods, laboratory simulation is still to be the best way of designing. To explain the reasons, this study has reviewed the literature. It was found that many factors like gradation curve and its properties, , grain shape, fine content, filter , etc. affect the soil-filter behavior. Later in this paper these factors are explained.

This research to investigate the ability of filters to stop cracks, has many  principal elements:

• Development of a laboratory filter test device for testing composite specimens with cracks formed through base coarse material.

-The effect of the grain size of the upstream and downstream filters on filtration mechanisms.

presents the main research findings and conclusions of the research study with   the recommendation of an improved filter design guideline. It also presents some future directions in this field.