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- 주제어 : Clayey sand (검색결과 3 건)
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점토 함유량에 따른 점토질 모래의 투수 및 압밀 특성 평가
김광균,박두희,유진권,이장근 한국지반공학회 2013 한국지반공학회논문집 Vol.29 No.3
Evaluation of permeability and coefficient of consolidation of clayey sand is critical in analyzing ground stability or environmental problems such as prediction of pollutant transport in groundwater. In this study, permeability tests using a flexible wall permeameter are performed to derive the coefficient of consolidation and permeability of reconstituted soil samples with various mixing ratios of kaolin clays and two different types of sands, which are Jumunjin and Ottawa sands. The test results indicate that the coefficient of consolidation and permeability plots linearly against clay contents in semi-log scale graphs for low clay mixing ratios ranging between 10 to 30%. It is also demonstrated that coefficient of consolidation and permeability of sand and clay mixture are dependent on the soil structure. Contrary to previous findings, the permeability is shown to be independent of the void ratio at low mixing ratios, which can be classified as non-floating fabric. The permeability decreases with the void ratio for floating fabric.
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세립분 함유율에 따른 점토질 모래의 역학적 특성 및 적용성 평가
김정면,안준영,허재영,이승주,김영석,문범수,김용성 한국지반신소재학회 2023 한국지반신소재학회 논문집 Vol.22 No.3
본 연구에서는 점토질 모래(SC)를 대상으로 실내시험을 수행하여 물리적 특성, 압밀/투수 특성, 응력-변형 특성을 분석하고, 세립분 함유량에 따라 모래에서 점토로 흙의 역학적 성질이 변화되는 전환 세립분 함유율을 도출하였다. 또한 현장 적용성평가를 위해 실제 과다침하로 인하여 문제가 발생된 연약지반 개량 현장의 계측자료를 수집하여 실내시험 및 수치해석 결과를바탕으로 도출된 침하특성과 현장에서 계측된 실제 침하특성을 비교·분석하여 SC의 압밀 대상층 적용성 평가를 수행하였다. 실내시험 및 압밀해석 결과 SC는 세립분 함유율 25%이상에서 사질토에서 점성토로의 역학적 특성 변화가 나타났으며, 점성토로의 역학적 특성 전환은 점토입자의 함유율과 매우 밀접한 관계가 있는 것으로 나타났다. 연약지반 현장의 수치해석을통해 전환 세립분 함유율 이상의 점토질 모래를 압밀 대상층으로 적용한 경우, 침하량이 계측침하량 대비 평균 91.2%로거의 일치하는 결과를 확인하였다. 따라서 연약지반 설계에서 압밀대상층 범위 선정 시 전환 세립분 함유율 이상의 점토질모래는 연약지반에 포함하여 적용하는 것이 바람직할 것으로 판단된다. In this research, laboratory tests were conducted on clayey sand (SC) to analyze its physical properties, compaction/ permeability characteristics, and stress-strain behavior. The main objective was to determine the transitional fines content at which the mechanical properties of sand transition to those of clay, resulting in a change in the geotechnical behavior of the material. Additionally, to assess the practical applicability of SC soil, field data from a soft ground improvement site with significant settlement issues were collected. The settlement characteristics derived from laboratory tests and numerical simulations were then compared and analyzed in relation to the actual settlement data obtained from the field, aiming to evaluate the suitability of the SC soil as a compaction target layer. The laboratory tests and compaction analysis showed that the SC soil exhibited a distinct change in mechanical properties, shifting from sandy behavior to clayey behavior when the fines content exceeded 25%. This transition in mechanical behavior was found to be closely correlated with the content of clay particles within the material. Through numerical simulations of the soft ground site, it was verified that the use of clayey sand with a fines content exceeding the transitional level as a compaction target layer resulted in settlements that closely aligned with the measured settlements, with an average agreement of 91.2%. Based on these findings, it is deemed advisable to incorporate clayey sand with a fines content exceeding the transitional level as part of the compaction target layer in the design of soft ground improvements.
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Mostafa Mohammadi,Ali M. Rajabi,Mahdi Khodaparast 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.1
The effect of nano-CaCO3 on the geotechnical properties of clayey sand (SC) soil was investigated. SC soil containing 10%, 20% and 30% clay and 0.3%, 0.7%, 1.1% and 1.5% nano-CaCO3 were cured for 7, 14 and 28 days and then subjected to uniaxial compression testing. The experimental results were analyzed numerically by the group method of data handling using an artificial neural network. Crystalline phases were analyzed by x-ray diffraction (XRD) to study the microstructure of soil specimens improved with nano-CaCO3. The addition of nano-CaCO3 to SC specimens, especially those with lower clay contents, increased their uniaxial compressive strength and the compressive strength increased over time. An optimum nano-CaCO3 level of 0.7% was determined for soil containing 10% and 20% clay and 1.1% for soil containing 30% clay. The results indicated a decrease in deformation and increase in stiffness of the soil with the addition of nano-CaCO3. The effect of nano-CaCO3 on the ultimate compressive strength of the soil in the XRD patterns indicated an increase in the recrystallization of the particles. Numerical analysis of the experimental results found a correlation for predicting the uniaxial compressive strength of the improved SC soil with a mean error of 4%.
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