• Title/Summary/Keyword: geotechnical behavior

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Reinforcement Effect of Steel-Concrete Composite Group Piles by Numerical Analysis (수치해석을 이용한 강관합성 무리말뚝의 보강효과 분석)

  • Chung, Moon-Kyung;Lee, Si-Hoon;Lee, Ju-Hyung;Kwak, Ki-Seok;Kim, Sung-Ryul
    • Journal of the Korean Geotechnical Society
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    • v.26 no.11
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    • pp.29-38
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    • 2010

  • The steel pipe of steel-concrete composite piles increases the pile strength and induces the ductile failure by constraining the deformation of the hiller concrete. In this research, the load-movement relations and the reinforcement effect by the outer steel pipe in the steel-concrete composite pile were analyzed by performing three-dimensional numerical analyses, which can simulate the yielding behavior of pile material and the elasto-plastic behavior of soils. The parameters analyzed in the study include three pile materials of steel, concrete and composite, pile diameter, pile distance and loading direction. The results showed that the axial capacity of the composite pile was about 90% larger than that of the steel pipe pile while similar to that of the concrete pile. At the allowable movement criteria, the horizontal capacity of the composite pile was about 50% lager than that of the steel pile and about 22% larger than that of the concrete pile.

  • https://doi.org/10.7843/kgs.2010.26.11.29 인용 PDF KSCI

The Critical Repeated Stress and Behavior of the Isotropic Normally Consolidated Clays Subjected to Repeated Loads. (반복하중을 받는 등방정친압밀점토의 거동 및 한계반복응력)

  • 김팔규;송전섭
    • Geotechnical Engineering
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    • v.4 no.3
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    • pp.43-52
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    • 1988

  • The behavior of clays subjected to Repeated loading has been shown to be very different from the behavior under a single load application. Especially the behavior of pore water pressure is Qf considerable importance. The objective of this work is to experimentally study the stress-strain characteristics of clays, and this study includes the pore water pressure which is built up during the load repetition. For this study, the samples were consolidated isotropically in the triaxial cell during 24 hours, .and monotonic strain controlled triaxial test is carried out by uslng the tests of Compression failure, Cycled at failure, and Nonfailure equilibrium on remoulded samples under undrained .condition . Consequently there exists a critical level of repeated loading which seperates the behavior of a particular sample into two distinctly different patterns.

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Assessment of pull-out behavior of tunnel-type anchorages under various joint conditions

  • Junyoung Ko;Hyunsung Lim;Seunghwan Seo;Moonkyung Chung
    • Geomechanics and Engineering
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    • v.36 no.1
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    • pp.71-81
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    • 2024

  • This study analyzes the pull-out behavior of tunnel-type anchorage under various joint conditions, including joint direction, spacing, and position, using a finite element analysis. The validity of the numerical model was evaluated by comparing the results with a small-scaled model test, and the results of the numerical analysis and the small-scaled model test agree very well. The parametric study evaluated the quantitative effects of each influencing factor, such as joint direction, spacing, and position, on the behavior of tunnel-type anchorage using pull-out resistance-displacement curves. The study found that joint direction had a significant effect on the behavior of tunnel-type anchorage, and the pull-out resistance decreased as the displacement level increased from 0.002L to 0.006L (L: anchorage length). It was confirmed that the reduction in pull-out resistance increased as the number of joints in contact with the anchorage body increased and the spacing between the joints decreased. The pull-out behavior of tunnel-type anchorage was thus shown to be significantly influenced by the position and spacing of the rock joints. In addition, it is found that the number of joints through which the anchorage passes, the wider the area where the plastic point occurs, which leads to a decrease in the resistance of the anchorage.

  • https://doi.org/10.12989/gae.2024.36.1.071 인용