Abstract
Problem statement: At present study Constant Rate of Strain (CRS) consolidation under Non-Darcy condition was investigated. Approach: In this study a governing conditions on pore water flow were investigated using proposed equation and experimental tests. CRS experiments under different rates of strain were conducted on different soil samples. Results: Results of these experiments and there comparison with proposed equation showed that flow of pore water flow in the most part of each test was Non-Darcy and changed to Darcy condition in the final almost one forth of tests. Conclusion: According to the results the threshold where Non-Darcy flow changes to Darcy was dependent on variations of relative pore water pressure versus total strain and it can be determined based on variations in inclination of relative pore water pressure-total stress curve.
Highlights
The first theory of Constant Rate of Strain (CRS) consolidation was presented by Crawford and Hamilton to cover disadvantages and limitations of incremental consolidation test
Almeida et al.[1] conducted some CRS consolidation tests on Brazil clays based on nondimetional parameter which was presented by Lee et al.[9] but they didn’t get correct results and criticized Lee methods
During progressive of consolidation settlement rate of excess pore water dissipation has a main rule which is depending on hydraulic of pore water flow[3] and all equations have derived based on Darcy flow rule
Summary
The first theory of CRS consolidation was presented by Crawford and Hamilton to cover disadvantages and limitations of incremental consolidation test They applied very slow strain rates as 0.005-.015% min−1, excess pore presser was created and they didn’t record[5]. Lee et al.[9] based on moving boundary and large strain theory defined a nondimentional parameter to choice proper strain rate. He presented two equations to determine coefficient of consolidation. At present study authors included Non-Darcy flow rule in CRS consolidation theory and the flow rule was investigated. This is one of the first studies about validity of NonDarcian flow in CRS consolidation
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