• Title/Summary/Keyword: Geotechnical properties

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Geoenvironmental Characteristics of Waste Concrete for Reusing in Civil Works (폐콘크리트 재활용을 위한 지반환경공학적 특성 분석)

  • 정하익;김상근;정길수;진현식
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.03b
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    • pp.536-541
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    • 2000
  • In recent years there has been a steady increase in geoenvironmental engineering research where geotechnical engineering has been combined with environmental concerns in the field of construction and industrial waste reusing in civil works. Many of these projects involve some investigation on the characteristics of geotechnical and environmental properties. In this study, investigation and test on the characteristics of demolished waste concrete was carried out to detect the physical, mechanical, and environmental properties for reusing as embankment and backfill materials in civil works.

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Application of Geotechnical Properties to the Slope Stability Analysis in Deep Weathered Zone (깊은 풍화대 사면의 안정성 해석에서 물성치 산정 및 적용)

  • Kim, Kyung-Tae;Park, See-Boum;Kim, Chang-Hyun;Lee, Jong-Bum;Yoon, Yea-Won
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.03a
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    • pp.768-776
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    • 2006
  • Recently in spite of Development of Investigation machine, in Application of Geotechnical Properties by empirical recommendation to the Slope Stability Analysis. It is generally Application of convenience and conservative Geotechnical Properties by Borehole Shear Test(BST) in Representative Zone that Non-Division of Increase as the depth of Strength Parameters In Deep Weathered Zone. Therefore, it is become environment pollution and Non-Economical Slope Design to Application of convenience and conservative Geotechnical Properties. The production mechanism of Deep Weathered Zone is tend to Weathering Degree low and Strength increase by increase as the depth. it is realistic design that Division of Deep Weathered Zone and application Geotechnical Properties of Each Layer. In this Paper, Determined The Relationship of Strength Parameters between Standard Penetration Test(SPT), Borehole Shear Test(BST) and empirical recommendation also Applyed each strength parameters of divided zone to the Slope Stability Analysis by continuous Borehole Shear Test(BST) in Deep Weathered Zone during design of The 2nd Bridge Connection Road of Incheon International Airport.

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Probabilistic Distribution and Variability of Geotechnical Properties with Randomness Characteristic (무작위성을 보이는 지반정수의 확률분포 및 변동성)

  • Kim, Dong-Hee;Lee, Ju-Hyoung;Lee, Woo-Jin
    • Journal of the Korean Geotechnical Society
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    • v.25 no.11
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    • pp.87-103
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    • 2009
  • To determine the reliable probabilistic distribution model of geotechnical properties, outlier and randomness test for analysis data, parameter estimation of probabilistic distribution model, and goodness-of-fit test for model parameter and probabilistic distribution model have to be performed in sequence. In this paper, the probabilistic distribution model's geotechnical properties of Songdo area in Incheon are estimated by the above proposed procedure. Also, the coefficient of variation (COV) representing the variability of geotechnical properties is determined for several geotechnical properties. Reliable probabilistic distribution model and COV of geotechnical properties can be used for probability-based design procedure and reasonable choice of design value in deterministic design method.

The Geotechnical Properties of Municipal Solid Waste Incinerator Fly Ash and Cement Stabilization (도시고형폐기물 소각 비산재의 지반공학적 특성 및 시멘트 안정화에 관한 연구)

  • 조진우;김지용;한상재;김수삼
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.03b
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    • pp.528-535
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    • 2000
  • Solid waste incinerator is expected to become widely used in Korea. The incineration of solid waste produces large quantities of bottom and fly ash, which has been disposed of primary by landfilling. However, as landfills become undesirable other disposal method are being sought. In this study, an experimental research is conducted to determine the geotechnical properties of municipal solid waste incinerator fly ash(MSWIF) in order to evaluate the feasibility of using the material for geotechnical applications. Basic pysicochemical characteristics, moisture-density relationship, strength, permeability, and leaching characteristics are examined. The results of MSWIF are compared to other MSWIF and coal fly ash which are used as construction material. In addition, the effectiveness of cement stabilization is investigated using various mix ratios. The result of stabilized mixes are compared to the unstabilized material. Cement stabilization is found to be very effective in reducing permeability, increasing strength, and immobilizing heavy metals. This results indicate that MSWIF with cement stabilization may be used effectively for geotechnical application.

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Experiments on Interfacial Properties Between Ground and Shotcrete Lining (지반과 숏크리트 라이닝의 인터페이스 특성에 관한 실험적 연구)

  • Chang, Soo-Ho;Lee, Seok-Won;Bae, Gyu-Jin;Choi, Soon-Wook;Park, Hae-Geun;Kim, Jae-Kwon
    • Proceedings of the Korean Geotechical Society Conference
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    • 2004.03b
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    • pp.407-414
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    • 2004
  • Interfacial properties between rock mass and shotcrete play a significant role in the transmission of loads from the ground to shotcrete. These properties have a major effect on the behaviours of rock mass and shotcrete. They, however, have merely been assumed in most of numerical analyses, and little care has been taken in identifying them. This paper aimed to identify interfacial properties including cohesion, tension, friction angle, shear stiffness, and normal stiffness, through direct shear tests as well as interface normal compression tests for shotcrete/rock cores obtained from a tunnel sidewall. Mechanical properties such as compression strength and elastic modulus were also measured to compare them with the time-dependent variation of interfacial properties. Based on experiments, interfacial properties between rock and shotcrete showed a significant time-dependent variation similar to those of its mechanical properties. In addition, the time-dependent behaviours of interfacial properties can be well regressed through exponential and logarithmic functions of time.

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Probabilistic real-time updating for geotechnical properties evaluation

  • Ng, Iok-Tong;Yuen, Ka-Veng;Dong, Le
    • Structural Engineering and Mechanics
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    • v.54 no.2
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    • pp.363-378
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    • 2015
  • Estimation of geotechnical properties is an essential but challenging task since they are major components governing the safety and reliability of the entire structural system. However, due to time and budget constraints, reliable geotechnical properties estimation using traditional site characterization approach is difficult. In view of this, an alternative efficient and cost effective approach to address the overall uncertainty is necessary to facilitate an economical, safe and reliable geotechnical design. In this paper a probabilistic approach is proposed for real-time updating by incorporating new geotechnical information from the underlying project site. The updated model obtained from the proposed method is advantageous because it incorporates information from both existing database and the site of concern. An application using real data from a site in Hong Kong will be presented to demonstrate the proposed method.

Probability Distribution of Geotechnical Properties of Songdo area in Incheon (인천 송도지역 지반정수의 확률분포 추정)

  • Kim, Dong-Hee;Kim, Min-Tae;Ko, Seong-Kwon;Park, Jung-Gyu;Lee, Woo-Jin
    • Proceedings of the Korean Geotechical Society Conference
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    • 2009.09a
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    • pp.1399-1406
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    • 2009
  • Probability distribution of geotechnical properties is very useful information and it is used for evaluating the geotechnical properties itself and calculating probability of failure. In this study, probability distribution of compression index, recompression index, and void ratio are evaluated, and analysis results show that all property distributions satisfy normal and log-normal distribution.

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Case study on the variation of landfill soil properties due to waste materials' characteristics (매립장 폐기물 특성에 따른 지반특성 변화 사례 연구)

  • Kim, Jin-Hwan;Cho, Jin-Woo;Baek, Yong;Lee, Yong-Soo
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.1213-1216
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    • 2010
  • Developable areas nearby metropolitan areas, which has high the density of population are limited by highly industrialized. In recent, the redeveloping plans for the finished industrial and resident areas are pushing to resolve this problems. Getting to the exact properties for reclaimed wastes is very important to reuse of landfill. Also, a strategy for how to deal with follow-up measures have to based on the waste characteristics. A lot of environmental problems have been happened in finished waste landfill such as a nasty smell by seepage, pollution of surface and ground water, a poisonous gas and soil contamination. The environment pollution in waste landfill have been studied by many researchers. The goal of this study is estimate the effects for the ground properties with the environmental properties of waste in finished landfill. As the results, the chemical characteristics of seepage in landfill may effect directly or indirectly to capping layer. Therefore, sustainable researches are needed to develop a secure landfill over the long term.

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Application of hydraulic cylinder testing to determine the geotechnical properties of earth-filled dams

  • Rodriguez, Roman F.;Nicieza, Celestino G.;Gayarre, Fernando L.;Lopez, Francisco L. Ramos
    • Geomechanics and Engineering
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    • v.9 no.4
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    • pp.483-498
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    • 2015
  • This article describes a new in-situ load test called the Hydraulic Cylinder Test (HCT) and its application to determine the geotechnical properties of soil-rock mixtures. The main advantages of the test are its easy implementation, speed of execution and low-cost. This article provides a detailed description of the equipment and the test procedure, and examines a case study of its application to determine the geotechnical properties of an earth-filled dam for a tailings pond. The containment dams of the ponds are made from blocks of gypsum and marl, obtained from the excavation of the ponds, mixed in a matrix of sands and clays. The size of the rocks varies between 1 and 30 cm. The HCT is particularly useful for determining the geotechnical properties of this type of soil-rock mixture. Nine HCTs were carried out to determine its strength (c, ${\phi}$) and deformation (B, G) properties. The results obtained were validated using the Bim strength criterion, recently proposed, and some pressure meter tests carried out beforehand. The properties obtained are used to analyze the stability of the dam using computer simulations and a modification to its design is proposed.

The basic study about streaming potential generated by specimen fracture (시료 파괴 시 발생하는 SP에 관한 기초 연구)

  • Kim, Jong-Wook;Cho, Sung-Jun;Park, Sam-Gyu;Sung, Nark-Hoon;Song, Young-Soo
    • 한국지구물리탐사학회:학술대회논문집
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    • 2007.06a
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    • pp.291-296
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    • 2007
  • We measured potential waveform of load, displacement, micro electric signal generated by rock and mortar fracture using PXI A/D Converter. The rock type used for measurement was used granite, limestone and sandstone, and mortar specimen. we made measuring equipment of physical properties to confirm basic information of physical properties, measured physical properties of rock engineering, electric resistivity and seismic velocity. Potential waveform system was built using PXI A/D Converter and measured potential waveform of load, displacement, micro-electric signal generated using this during uniaxial compressive test by the specimen finished such test of physical properties. Using the saturated rock and mortar specimen, micro electric signal increased, and It didn't increase a signal in dried rock and mortar specimen according as load and strain rate increases. But signal also increased in saturated or dried specimen in case of sandstone. It was possible to check the close correlation relationship the signal and fracture behavior by a compressive load as the signal of fracture position was increased bigger than the other position. It was also possible to check the correlation relationship between physical properties and micro geo-electric signal.

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