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변형률 제어 반복직접단순전단시험에서 세립분이 모래- 실트 혼합토의 간극수압에 미치는 영향 KCI 등재
Effect of Non-Plastic Fines Content on the Pore Pressure Generation of Sand-Silt Mixture Under Strain-Controlled CDSS Test
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/429373
Understanding the behavior of soil under cyclic loading conditions is essential for assessing its response to seismic events and potential liquefaction. This study investigates the effect of non-plastic fines content (FC) on excess pore pressure generation in medium-density sand-silt mixtures subjected to strain-controlled cyclic direct simple shear (CDSS) tests. The investigation is conducted by analyzing excess pore pressure (EPP) ratios and the number of cycles to liquefaction (Ncyc-liq) under varying shear strain levels and FC values. The study uses Jumunjin sand and silica silt with FC values ranging from 0% to 40% and shear strain levels of 0.1%, 0.2%, 0.5%, and 1.0%. The findings indicate that the EPP ratio increases rapidly during loading cycles, with higher shear strain levels generating more EPP and requiring fewer cycles to reach liquefaction. At 1.0% and 0.5% shear strain levels, FC has a limited effect on Ncyc-liq. However, at a lower shear strain level of 0.2%, increasing FC from 0 to 10% reduces Ncyc-liq from 42 to 27, and as FC increases further, Ncyc-liq also increases. In summary, this study provides valuable insights into the behavior of soil under cyclic loading conditions. It highlights the significance of shear strain levels and FC values in excess pore pressure generation and liquefaction susceptibility.
2. Materials and Testing Program
2.1 Materials Properties
2.2 Testing Program and Liquefaction Criteria
3. Results and Discussion
3.1 Test Results
3.2 Excess Pore Pressure Generation in Clean Sand
3.3 Excess Pore Pressure Generation in sand-silt Mixtureand Effect of Non-Plastic Fine Content
3.4 Comparison with Previous Study
4. Conclusion
