Abstract
Under certain unique situations a permeating liquid can approach a geotextile filter under dynamic conditions. Such hydrodynamic conditions can represent the ultimate challenge to the proper functioning of the filter, particularly from a soil retention perspective. This short note presents a laboratory test method which can be used to simulate such hydrodynamic conditions. The soil (in total or its fine fraction) is added incrementally to the test setup. Dynamics pulses are then applied under controlled pressure conditions for a given time period. Flow rate, or permittivity, tests are then conducted in the conventional manner. The limiting behavior developed over successive soil increments can then be assessed. The purpose of this technical note is to describe the test setup and illustrate the flow rate behavior under a variety of soil, geotextile and pulse intensity conditions.
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