Investigation of Effective Parameters on the Embankment Dam Filter Behavior in Simultaneous Cracking in the Core and Filter |
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| Authors: | S M Ali Zomorodian and Mohammad Jamali Moghadam |
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| Institution: | (1) Water Engineering Department, Shiraz University, Shiraz, Iran |
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| Abstract: | Cracks in filter can develop as a result of earthquake deformations or post-construction settlement and in some cases cracks
extended through both the core and filter. Hence, a test apparatus has been developed to investigate filter performance in
the case of filter and core material cracking in the embankment dams. The apparatus allows testing of incomplete cylindrical
test specimens of 10 cm diameter and height of 20 cm. If the filters work well and successfully, crack filling occur, also
the flow rate decrease, and the head water pressure increase to the range of early pressure. In the failed filters case, the
flow rate do not decrease and remain high, also a very low head water pressure take place. In this research, variations of
pressure, fines contents of filter soils, compaction time, PI of the base material and amount of eroded materials was evaluated.
Results showed that prime flow rate increased as hydraulic gradient increased, but decreased in a little time and reach to
a stable value. Filter with 15% of non-plastic fine content, had ability to slump to fill the crack, but its coefficient of
permeability decreased significantly, hence, cannot be used as a filter in embankment dams. |
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