Investigation on the Characteristics of Pore Water Flow During CRS Consolidation Test |
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| Authors: | H Ahmadi H Rahimi A Soroush |
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| Institution: | (1) Department of Water Engineering, Urmia University, Urmia, Iran;(2) Department of Irrigation and Reclamation, Tehran University, Tehran, Iran;(3) Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran |
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| Abstract: | Several experimental methods have been proposed for consolidation test such as: constant loading rate, constant gradient and
constant rate of strain (CRS). Unfortunately, there are no unique criteria for performing the CRS consolidation test. Also,
there are considerable differences among the standards proposed for the test. In the present paper, authors have tried to
find the reasons for differences among standards, by studying the basic assumptions made on the characteristics of the pore
water flow during consolidation process. In the course of study, CRS consolidation tests were carried out under different
strain rates on remolded samples. The results of the tests have indicated that the Darcy’s law is not valid throughout the
CRS test and therefore, any consolidation equation based on Darcy’s law would not provide accurate results. The results of
the current experiments also showed that with regard to the applied strain rates, there are three different flow regimes governing
the process named as: pre-linear (non-Darcy flow), linear (Darcy flow) and post-linear (non-Darcy flow). Experimental results
also showed that distinction between boundaries of linear and nonlinear flow is possible from the excess pore pressure developed
during the tests. |
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