일정변형률압밀시험에 의한 연약점토의 압밀특성에 관한 연구 = A Study on the Consolidation Characteristic of Soft Clay by CRS

다국어 초록 (Multilingual Abstract)

There is the important labortary test for clays on characteristics of consolidation. This frequently used testing method was developed on the theory of Terzaghi, K.(1936). However, the standard incremental loading consolidation test(IL-consolidation test) has shortcomings, which are long testing time and limited drainage condition, in spite of its importance. So many researchers have been proposing new consolidation tests. For the purpose of decreasing test time, rapid consolidation tests were suggested and advanced testing machine for expanding of drainage conditions. Especially in rapid consolidation tests, due to simplicity and easy equipment of test device, the constant rate of strain (CRS) consolidation test has been the widely used test method and the alternative of IL-consolidation test recentely.
This paper is to evaluate consolidational coefficient of soft clay by performing the strain controlled test of Constant Rate of Strain Consolidation(CRS).
Compared with the conventional consolidation tests, this technique has an advantage of obtaining the coefficient within a short period of times
A series of conventional tests and ORS consolition tests with different rates of strain were performed to investigate the consolidation tests with different rates of strain were performed to investigate the consolidation characteristcs of maraine clay. Preconcolidation pressures were evaluated by applying previously proposed methods for both the conventional tests and CRs tests results in order to check the legitimacy of these methods. The effects of strain rate on effective consolidation stress-strain relationship, porewater pressure, and preconsolidation pressure were also discussed.
It was found that the preconsolidation pressure could define from chinnging point of the excess pore pressure. And also the maximum pore pressure was affected by the straine rate. The porewater pressure ratios during CRS tests were in range from 5% to 18%. The strain - vertical effective stress curve could apply for getting coefficient of consolidation better than the void ratio - vertical effective stress curve because of initial void ratio effect.