• Title/Summary/Keyword: 압축지수분포

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Consideration of Physical and Compression Characteristics among Western and Southern Coastal Marine Clays - Incheon·Mokpo·Gwangyang·Busan - (서·남해안 해성점토의 물리·압축특성 고찰 - 인천·목포·광양·부산 -)

  • Kim, Sangkwi;Yea, Geuguwen;Kim, Kilsu;Kim, Hongyeon
    • Journal of the Korean GEO-environmental Society
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    • v.12 no.6
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    • pp.43-51
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    • 2011
  • Marine clays are widely distributed in Korean eastern, western and southern coastal areas. Understanding engineering characteristics of the soft ground is very important, whenever civil structures are constructed in those coastal areas. It is because the ground is composed of highly compressible marine clay. In this paper, the physical and compression characteristics of Incheon, Mokpo, Gwangyang and Busan marine clay were analyzed and the characteristics between western and southern coastal marine clays were compared. For this, test results of 1,471 samples from 114 sites were used. As a result, Incheon clay showed the lowest plasticity and the highest unit weight due to influx of silt from the Yellow River and the turn of the tide of Incheon area. However, Gwangyang clay showed highly compressible characteristic due to extensive reclamation. On the other hand, Mokpo and Busan clay showed partially similar levels of characteristics. The compression index of Mokpo and Busan clay was high more than twice in comparison with Incheon clay and that of Gwangyang clay was higher than seventy percents in comparison with Mokpo and Busan clay.

A Study on the Character of Concrete compressive strength according to Bottom-Ash and Internal gap for Crack aspect predictions (Bottom-Ash를 활용한 콘크리트 압축강도와 내부 공극 특성 분석 및 균열양상 예측)

  • Jung, Woo-Young;Sim, Young-Hwan;Lee, Sang-Moon;Choi, Hyun-Kyu
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.713-716
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    • 2008
  • In about the concrete application which recycles Ash the research came to be advanced as research in compliance with researchers relation actively in about cement substitutional concrete mixing ratio and burglar quality of existing. The research which it sees as fundamental research the research which it follows in cement substitutional concrete mixing ratio of existing and it researched different Bottom-Ash recycling qualities in about cup aggregate partial substitution Bottom-Ash application.

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Physical and Chemical Variation of Sedimentary Rocks due to Weathering (풍화에 의한 퇴적암의 물리-화학적 변화)

  • Kim, Young-Su;Heo, No-Young;Jeong, Woo-Seob;Rui, Da-Hu;Lee, Jea-Ho
    • Journal of the Korean GEO-environmental Society
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    • v.3 no.2
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    • pp.49-60
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    • 2002
  • A study on mineral composition and chemical component governing of weathering process is necessary to know the weathering characteristics of sedimentary rocks. In this study, a mineral and chemical component analysis, and physical and engineering characteristic tests were conducted to find out the characteristics of sedimentary rocks in Daegu, according to the weathering degree of sedimentary rock. Test results show that the mineral composition of rock, such as Albite (Ab), Muscovite (Ms), Magenetite (Mt) and the chemical composition of $A_2O_3$, CaO, $Na_2O$, $K_2O$, MgO and so on are closely related to the weathering. Based on the test results, we illustrated the quantitative application of weathering decision for the sedimentary rocks.

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A Study on Correlation between Soil Properties and Parameters of Soft Clay in Honam Coastal Region (호남해안지역 연약점토의 토질특성과 제 토질정수와의 상관성에 관한 연구)

  • Kim Jong-Ryeol;Choo Youn-Woo;Kang Hee-Bog;Kim Gyo-Jun;Lee Sang-Hun
    • The Journal of Engineering Geology
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    • v.14 no.4 s.41
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    • pp.371-379
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    • 2004
  • Soil investigation data at 7 different locations around Honam costal region were analyzed and experimental correlations between soil properties and parameters of soft clay were presented. Most soils were classified as CL and CH by the Unified Soil Classification System and were unstable structurally because the water contents were generally greater than the liquid limits. The compression index has good correlations with water content, liquid limit and initial void ratio. The trend of these correlations were similar to the Skempton equation Cc = 0.009(LL -10) and other studies for Korean soft clays but the constants were small different. The slope of these correlations for Honam costal region were slightly greater than those for Kyunggi costal region and Kyungnam costal region. The correlation coefficient (R) between the liquid limit and the plastic index is 0.93. It is seen that not only the water content and the liquid limit but also the water content and the initial void ratio are correlate, therefore the experimental equations were presented for the practical purpose.

A Study on the Calculation of Consolidation Constants using Moisture Content of Sedimentary Clay in Busan and Gyeongnam Regions (부산·경남지역 퇴적 점토의 함수비를 이용한 압밀정수 산정 연구)

  • Sung-Uk Kang;Dae-Hwan Kim;Tae-hyung Kim;Chin-Gyo Chung;In-Gon Joo
    • Journal of the Korean Geosynthetics Society
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    • v.23 no.1
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    • pp.39-47
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    • 2024
  • In this study, physical property tests and standard consolidation tests were conducted on the marine clay of Busan New Port and North Port, the middle and lower reaches of the Nakdong River including Gimhae and Yangsan, and Ulsan regions. The moisture content, a property unrelated to sample disturbance with small individual test errors, was used for regression analysis with the compression index, virgin compression index, consolidation coefficient, expansion index, and secondary compression index, among others. Subsequently, the correlation and accuracy were evaluated. Upon analyzing the correlation between the moisture content, void ratio, and liquid limit commonly used physical properties for calculating compression indexes, it was confirmed that the liquid limit had the lowest correlation. Through a linear regression analysis of the consolidation constants using the current moisture content in the natural state, a high correlation was demonstrated. Relationship equations were then presented to determine settlement and settlement time. This study suggests that moisture content can be utilized as an alternative for evaluating and calculating consolidation constants when examining ground settlement in sedimentary clays distributed in the Busan and Gyeongnam regions.

Los Angeles Abrasion Test for Estimating Engineering Index on the Sedimentary Rocks of Kyeongsang Basin (퇴적암의 공학지수를 추정하기 위한 L. A. 마모율 시험)

  • Min, Tuk-Ki;Moon, Jong-Kyu;Lee, Sang-Il
    • Journal of the Korean Geotechnical Society
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    • v.23 no.11
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    • pp.15-26
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    • 2007
  • Los Angeles abrasion loss test has usally been applied to the quarry for the purpose of aggregate hardness estimation. 324 blocks from 25 sites of Kyeongsang basin samples of sedimentary rock were examined and tested in laboratary. This paper found that L. A. abrasion loss test is a good method to estimate engineering index such as uniaxial compressive strength, elastic modulus, indirect tensile strength, point load strength index, Schmidt hammer rebound value of sedimentary rocks with high correlation factor. Engineers will prefer L. A. abrasion loss test to the other one for design and construction as this method is quick and easy.

The Influence of Distribution Characteristics of Compression Index on the Spatial Distribution of Consolidation Settlements (압축지수분포 특성이 압밀침하량 분포에 미치는 영향)

  • Kim, Dong-Hee;Kim, Min-Tae;Kim, Kyu-Sun;Lee, Woo-Jin
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09b
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    • pp.76-80
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    • 2010
  • This paper describes that estimation methods for the distribution of consolidation settlements to investigate the influence of distribution characteristics of compression index on the spatial distribution of consolidation settlements. When the variation of compression index is considerable, the spatial distribution of compression index is estimated using ordinary cokriging. The spatial distribution of consolidation settlements estimated by considering both the variation of compression index and void ratio (CASE-1) is different from the conventional mean value of all soil properties (CASE-2). The settlement of CASE-1 shows the larger variation at short distances rather than that of CASE-2. Whereas the spatial settlement distribution of CASE-1 is affected by the spatial distribution of compression index and the thickness of consolidation layer, the distribution of CASE-2 is significantly influenced by the distribution of the thickness of consolidation layer.

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Analysis of the Relationship between Concrete Slab Track Life and Secondary Compression Characteristics in Soft Clay (점토의 2차 압축특성과 콘크리트궤도 수명과의 상관성 분석)

  • Lee, Sang-Cheol;Cho, Kook-Hwan
    • Journal of the Korean Society for Railway
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    • v.19 no.2
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    • pp.195-203
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    • 2016
  • Concrete slab track was applied to the Gyeoungbu High Speed Railroad step 2 and the Honam High Speed Railroad. Concrete slab track incurs higher construction cost and lower maintenance cost than existing gravel track. For these reasons, the use of concrete slab track has increased in Korea. The biggest problem in the use of concrete slab track is repairing damage from settlement that can occur while trains are in service. High speed railroad design standards require allowable residual settlement of concrete slab track of less than 25mm. In order to satisfy the requirement of long term stability of concrete slab track, it is necessary to manage the secondary compression settlement within the allowable residual settlement. This study is to evaluate the secondary compression settlement with the variation of the secondary compression index, thickness of soft ground, and concrete slab track life. Statistical analysis is performed to determine the probability of distribution of areas where serious problems will be caused after the concrete slab track is constructed.

A Study on the Engineering Characteristics of Yang-dong Organic Soils (영동지역 유기질토의 공학적 특성에 관한 연구)

  • Park, Heung-Gyu;Koo, Je-Min
    • Journal of the Korean GEO-environmental Society
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    • v.2 no.1
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    • pp.23-30
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    • 2001
  • A Series of laboratory tests were conducted to investigate the engineering characteristics for organic soil widely distributed in Yong-dong region which always makes problems in construction works. Physical characteristics of Yong-dong organic soil area were measured in terms of such categories as nature water content, organic content, specific gravity, liquid limit, and plasticity index. As a result, it was found that nature water content was $50.8^{\circ}-343.5%$, organic content 12.1-42.5%, specific gravity 1.76-2.71, liquid limit 46.6-440.2%, and plasticity index 9.2-557.2%. Also, as consolidation load increases, consolidation coefficient slightly decreases with small up and down. The ratio of secondary consolidation coefficient to compression index is 0.001-0.091 $C_a/C_c$, secondary coefficient tends to increase greatly when organic content is in the range of 11-22%.

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Correlation Analysis between Injury Index of Multi-cell Headrest through k-means Clustering DB (k-means clustering DB를 통한 Multi-cell headrest의 상해지수 간 상관관계 분석)

  • Sungwook Cho;Seong S. Cheon
    • Composites Research
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    • v.37 no.1
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    • pp.46-52
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    • 2024
  • The development of transportation methods has improved human transportation convenience and made it possible to expand the travel radius of people with disabilities who have difficulty moving. However, in the case of WAV (wheelchair Accessible Vehicle), the safety that may occur in a vehicle accident is still lower than that of regular passenger seats. In particular, in the case of a rear-end collision that may occur in a defenseless situation, it can cause fatal neck injuries to disabled passengers. Therefore, a more detailed design plan must be reflected in the headrest to be applied to WAV. In this study, a multi-cell headrest was proposed to implement local compression characteristic distribution of the headrest during rear-end collision of WAV. Afterwards, a correlation analysis was performed between the passenger's NIC (Neck Injury Criterion) and impact energy absorption using the data set construction through analysis and the clustering results using k-means clustering. As a result of clustering, it was confirmed that data clusters with similar characteristics were formed, and a correlation analysis between NIC and impact energy absorption through the characteristics of each cluster was performed. As a result of the analysis, it was confirmed that the softer the cell compression characteristics in Mid3 and Mid6, the more impact energy absorption increases, and the harder the cell compression characteristics in Front2, Mid3, and Mid6, the more effective it is in reducing NIC.