• Title, Summary, Keyword: 지반조사

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Analysis on the efficiency of underwater SPT module and stability for seabed type geotechnical investigation equipment (무인 착저식 지반조사 장비의 안정성 검토 및 수중 SPT효율 분석)

  • Kim, Woo-Tae;Jang, In-Sung;Ko, Jin-Hwan;Shin, Chang-Joo;Kwon, O-Soon;Lee, Seung-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.3
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    • pp.1778-1785
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    • 2014
  • In order to construct offshore structures safely, geotechnical investigation should be carried out with high accuracy. Up to now, onshore geotechnical investigation equipments installed on the barge are used for offshore geotechnical investigation. In this case, many limitations can be confronted such as deep water depth, high wave, strong current, severe wind and so on. For the safe and economic offshore geotechnical investigation with high precision, a seabed type unmanned automated site investigation equipment is developed. It can be operated remotely underwater conditions with 100m water depth and can explore the ground depth of 50m. Also, the standard penetration test (SPT), soil boring, soil sampling and rock coring can be possible using the equipment. Numerical analysis was conducted to secure the stability of the equipment against current of 4 knot. Energy efficiency of SPT apparatus which is attached to the equipment shows 78% in average.

An Estimation of Long-term Settlements in the Large Reclamation Site and Determination of Additional Sampling Positions Using Geostntistics and GIS (GIS 및 지구통계학을 적용한 대규모 매립지반의 장기 침하량 예측 및 추가 지반조사 위치의 결정)

  • Lee, Hyuk-Jin;Park, Sa-Won;Yoo, Si-Dong;Kim, Hong-Taek
    • Journal of the Korean Geotechnical Society
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    • v.20 no.2
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    • pp.131-141
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    • 2004
  • For geotechnical applications, engineers use data obtained from a site investigation to interpret the structure and potential behavior of the subsurface. In most cases, these data consist of samples that represent 1/100,000 or less of the total volume of soil. These samples and associated field and lab testing provide the information used to estimate soil parameter values. The resulting values are estimated ones and there exists some likelihood that actual soil conditions are significantly different from the estimates. This may be the case even if the sampling and interpretation procedures are performed in accordance with standard practice. Although these efforts have been made to characterize the uncertainty associated with geotechnical parameters, there is no commonly accepted method to evaluate quantitatively the quality of an investigation plan as a whole or the relative significance of individual sampling points or potential sampling points.

Development of Geotechnical Information Input System Based on GIS on Standization of Geotechnical Investigation Result-format and Metadata (지반조사성과 양식 및 메타데이터 표준화를 통한 GIS기반의 지반정보 입력시스템 개발)

  • Jang, YongGu;Lee, SangHoon
    • Journal of The Korean Society of Civil Engineers
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    • v.28 no.4D
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    • pp.545-551
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    • 2008
  • The MOCT(Ministry of Construction & Transportation) gave a order named as "The guideline for computerization and application of geotechnical investigation result" to an affiliated organization in March 2007. Today, pilot project of construction of geotechnical information database is in process to be stable for its system after applying this guideline, and discipline how to input investigated data for related users. We have developed standard for geotechnical investigation result-format, metadata for distribution of geotechnical information and to coordinate based on world geodetic system. Also, We had a introduce to status with respect to use the input system, collect a statistics of input contents. At a result, improvement items of input system is proposed. It was analyzed that most users put to practical use easily as a result of education for making use of on the spot of the developed GIIS. But There were problems with the GIIS as well as complexity of metadata formation, such as error of moving part of information window, and a part of recognition error of install program in accordance with computer OS circumstances. Particularly, to improve some parts of GIIS is needed, because of use of or KNHC (Korea National Housing Corporation)-specific format and difference of input process followed by MOCT's guideline. In this study, it is planning to make up for occurred problems, and improvements when operating and managing the Geotechnical Information DB center in 2008.

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Comparison of Ordinary Kriging and Artificial Neural Network for Estimation of Ground Profile Information in Unboring Region (미시추 구간의 지반 층상정보 예측을 위한 정규 크리깅 및 인공신경망 기법의 비교)

  • Chun, Chanjun;Choi, Changho;Cho, Jinwoo
    • Journal of the Korean Geoenvironmental Society
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    • v.20 no.3
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    • pp.15-20
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    • 2019
  • A large amount of site investigation data is essential to obtain reliable design value. However, site investigations are generally insufficient due to economic problems. It is important to estimate the ground profile information in unboring region for accurate earthwork-volume prediction, and such ground profile information can be estimated by using the geo-statistical approach. Furthermore, the ground profile information in unboring region can be estimated by training a model via machine learning technique such as artificial neural network. In this paper, artificial neural network-based model estimated the ground profile information in unboring region, and this results were compared with that of ordinary kriging technique, which is referred to the geo-statistical approach. Accordingly, a total of 84 ground profile information in an actual bridge environment was split into 75 training and 9 test databases. The observed ground profile information of the test database was compared with those of the ordinary kriging technique and artificial neural network.

Response Analysis of Nearby Structures to Excavation-Induced Advancing Ground Movements (지반굴착 유발 진행성 지반변위에 의한 인접구조물의 거동분석)

  • Son, Moorak
    • Journal of The Korean Society of Civil Engineers
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    • v.29 no.4C
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    • pp.153-162
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    • 2009
  • This paper investigates the effects of excavation-induced ground movements on nearby structures, considering soil-structure interactions of different soil and structural characteristics. The response of four and two-story block structures, which are subjected to excavation-induced advancing ground movements, are investigated in different soil conditions using numerical analysis. The structures for numerical analysis are modelled to have cracks when the shear and tensile stress exceed the maximum shear and tensile strength. The response of four and two-story block structures are investigated with advancing ground movement phases and compared with the response of structures which are subjected to excavation-induced total ground movement. The response of structures is compared among others in terms of the magnitude and shape of deformations and cracks in structures for different structure and ground conditions. The results of the comparison provide a background for better understandings for controlling and minimizing building damage on nearby structures due to excavation-induced ground movements.

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A Comparison of Soil Characteristics of Excavated Soils in Urban Area (도심지 굴착지반의 지반특성 비교)

  • Kim, Byungchan;Lee, JineHaeng
    • Journal of Korean Society of Disaster and Security
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    • v.10 no.1
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    • pp.35-42
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    • 2017
  • This is a comparative study on the characteristics of excavated soils, which is proceeded using soil strength parameter by literature, geotechnical investigation, standard penetration test by drilling, and downhole test by borehole at six sites in urban areas. The results of these site surveys are used as basic data for the evaluation and development of prediction of ground subsidence risk. Geotechnical properties are estimated with the result of standard penetration test-N value and literature. The dynamic geotechnical characteristics are also estimated with top-down seismic exploration at borehole.

Ideas for Drawing Proper Drilling Logs (합리적인 시추주상도 작성에 관한 소고)

  • 최성순;최수철;김태욱
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.13-33
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    • 2003
  • 시추조사는 설계 및 시공을 위한 기본적인 조사이며 조사자는 지층을 정확히 판단하고 시추주상도를 매개체로하여 이를 설계자와 시공자에게 전달하여야 한다. 많이 개선되었다고는 하지만 시추주상도의 내용이 작성자 또는 작성회사별로 양식과 기재방법이 다른 경우가 많아 시추주상도의 역할이 반감되는 경우가 많다. 본 고에서는 조사업계에 종사한 경험을 바탕으로 합리적인 시추주상도 작성을 위해 국내외의 시추주상도 양식을 비교하고 표준안을 제시하였으며 기재방법의 통일을 기하기 위한 개선 사항을 제시하였다.

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Necessity of Establishment of Standards and Commentary for Laboratory Soil Tests by KGS (실내 토질시험에 대한 학회기준 제정 및 해설서 발간의 필요성)

  • Shin, Dong-Hoon;Kim, Ki-Young;Im, Eun-Sang;Park, Han-Gyu
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.656-662
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    • 2008
  • 1990년대 중반 이후 다양하고 많은 지반조사 및 실내시험 기술이 도입되어 사용되고 있고, 이제는 상당한 경험과 데이터가 축적되고 있음에도 불구하고 우리나라 또는 우리 지반공학회와 같은 학회 차원의 조사 및 시험 기준 정립이 미흡한 실정이다. 이에 본 논문에서는 국가 차원에서 이미 제정되어 있는 지반공학 관련 조사 및 시험 기준을 선진외국의 기준 현황과 비교검토하여 우리의 현주소를 살펴보았다. 또한, 최근 건설제도의 변화와 사회 전반의 기술발전에 따라 지난 10여년간 다양하고 활발하게 시도되고 있는 실내 토질시험 실시현황 등을 살펴보고 이들에 대한 기준의 추가 제정과 해설집 발간의 필요성을 제기하였다.

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