• Title, Summary, Keyword: Ground investigation

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A Study on the Development of the Ground Boundary Points Record Focusing on Registration and Management (지상경계점등록부 등록 및 관리 개선방안에 관한 연구)

  • Park, Jung-Hee;Jang, Bong-Bae;Choi, Yun-Su
    • Journal of Cadastre & Land InformatiX
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    • v.44 no.2
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    • pp.1-23
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    • 2014
  • South Korea makes and manages the ground boundary points record to efficient menage for the installed ground boundary points from cadastral survey with established the Land survey Channel investigation and Cadastre law Section 65 on 17 July 2013. However, this system's negative perception is spreading across the country because of the excessive business process time and inadequate availability. Consequently, this study has analyzed implementation problems of the ground boundary points record. Moreover reasonable development plans have been proposed through the investigation of the advanced foreign cases and interview of the international cadastral experts. Based on this study, it looks forward to improvement more enhanced reliability of the Korean cadastral system.

TUNNELLING IN SOFT GROUND IN URBAN AREAS

  • Fujita, Keiichi
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.9-24
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    • 1990
  • Most tunnels in soft soils in urban areas are constructed by shield tunnelling method for environmental reasons. Ground surface settlements are caused by shield tunnelling so that auxiliary measures are often required. Simple methods to predict ground surface settlement are given. The use of the slurry or the earth pressure balance shield machine and the application of new methods of grouting with computer aided operation control systems decreases the ground surface settlement to 3 mm. The construction cost of tunnels is almost identical whichever type of shield machine is employed according to a statistical investigation.

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A STUDY ON THE CORRELATION BETWEEN GROUND SUBSIDENCE AREA NEAR ABANDONED UNDERGROUND COAL MINE AND GEOPHYSICAL PROSPECTING DATA USING GIS

  • Kim Ki-Dong;Choi Jong-Kuk;Won Joong-Sun
    • Proceedings of the KSRS Conference
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    • pp.325-328
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    • 2005
  • To estimate presumptive local ground subsidence area near Abandoned Under ground Coal Mine(AUCM) at Samcheok city in Korea, the geological properties of existing ground subsidence area and the geophysical prospecting data were analyzed using GIS. The electrical resistivity survey and seismic reflection survey database were constructed from investigation reports and factors which are related with ground subsidence such as geological map, topological map, land use map, lineament map, groundwater level, RMR (Rock Mass Rating), mining tunnel map and slope database were constructed also to make a comparative study of each parameters. As a result of the spatial analysis of existing ground subsidence area, 9 major factors causing ground subsidence were extracted and a connection between the structure of underground and the ground subsidence was determined from the analysis of geophysical prospecting data. The estimation of presumptive ground subsidence area was performed using the correlation between the result from neural network analysis of 9 factors and the scrutiny of geophysical prospecting data.

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Investigation of Ground Remote Sensing Technique Using CCD Camera (CCD 카메라를 이용한 지상원격탐사 기술 개발)

  • Kim, Eung Nam
    • Journal of The Korean Society of Civil Engineers
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    • v.26 no.2D
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    • pp.325-333
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    • 2006
  • Recently, in the case of observing the global environment, satellite remote sensing technology has been important. It's because satellite remote sensing is valuable for assessing relatively large areas. But now, small scale remote sensing techniques are needed which can be applicable to the detail investigation of plant tree areas which afforest land after the large scale construction of roads, dams and airports. In this study, we tried to develop and propose a lower altitude sensing technique which can be used in ground remote sensing by using a CCD camera. As a result of this investigation the following can be concluded: We recognized the transference characteristics of filters which were used in comparative tests about the four ground remote sensing devices. We also found that the near-IR camera could be used for an imaging spectral radiometer in the extraction of the vegetation index. Furthermore, we found that the vegetation index has varied hour by hour during the day of the experiment. Finally, we brought about an increase phase of the NDVI in a forest fire, which caused considerable damage, by developing new ground remote sensing technology.

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Soil Contamination Analysis and its Treatment for Landfilled Area (폐기물 매립지반 오염도 분석 및 처리방안에 대한 연구)

  • Shin, Eun-Chul;Kang, Jeong-Ku;Jang, Woo-Lam
    • Journal of the Korean Geosynthetics Society
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    • v.8 no.2
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    • pp.1-9
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    • 2009
  • When some structures are constructed over the sanitary landfill, the waste should be treated by means of replacement and other ways. Otherwise, various problems like a ground contamination, settlement, reduction of bearing capacity and others may be generated. To find out the optimal method of treatment, the properties of the ground have to be inspected. In this study, the preliminary investigation was conducted to find out the characteristic of this site which is considered as insanitary waste landfill. Furthermore, the shape and the amount of the waste was investigated by subsurface investigation like a boring and sampling methods. In addition, the degree of ground contamination and disposal method of refuse was examined.

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3D Visualization Technique Based Tunnel Design (3차원 가시화 기법을 이용한 터널설계)

  • 홍성완;배규진;김창용;서용석;김광염
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.759-766
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    • 2002
  • In the paper the authors describe the development of ITIS(Intelligent Tunneling Information System) for the Purpose of applying the 3D visualization technique, GIS, AI(Artificial Intelligence) to tunnel design and construction. VR(Virtual Reality) and 3D visualization techniques are applied in order to develope the 3D model of characteristics and structures of ground and rock mass. Database for all the materials related to site investigation and tunnel construction is developed using GIS technique. AI technique such as fuzzy theory and neural network is applied to predict ground settlement, decide tunnel support method and estimate ground and rock mass properties according to tunnel excavation steps. ITIS can help to inform various necessary tunnel information to engineers quickly and manage tunnel using acquired information based on D/B.

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에코콘 탐사시스템을 이용한 지반특성 및 지반환경 조사

  • 정하익;김영진;홍승서;강동우;이경국
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • pp.67-70
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    • 2004
  • The purpose of this study is to develop the investigation technology of ground characteristics and environments using eco cone penetration system. The underground environments of landfill was investigated and analyzed by this eco cone system. The electrical resistivity sensor, pH sensor, ORP sensor, and thermometer are installed in eco cone penetration system. This eco cone penetration system provides a continuous profile of measurements in underground, and provides repeatable, reliable and cost effective results for investigation of clean and contaminated ground.

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A study on new soil investigation method using seismic waves generated by dynamic penetration blows

  • Saito Hideki
    • 한국지구물리탐사학회:학술대회논문집
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    • pp.3-9
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    • 2005
  • In order to obtain more reliable data for the information on the ground, a new site Investigation method is proposed, in which seismic waves (S-waves) generated by the Swedish Ram Sounding Test (SRS) are used. It is indicated that the energy transferred from the hammer to the rod in SRS's is much more stable, compared to SPT's. A series of SRS with measurements of seismic waves at the ground surface were carried out to clarify the characteristics of seismic wave propagation in the ground. As the results of comparison between seismic S-wave amplitudes and $N_d$ (blow count for 20 cm penetration in SRS), it was found that amplitudes of S-waves generated by SRS correlate well with $N_d$. The amplitude of the S-wave is thought to be more adequate parameter for the soil strength and rigidity than $N_d$.

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Site specific ground motion simulation and seismic response analysis for microzonation of Kolkata

  • Roy, Narayan;Sahu, R.B.
    • Geomechanics and Engineering
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    • v.4 no.1
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    • pp.1-18
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    • 2012
  • The spatial variation of ground motion in Kolkata Metropolitan District (KMD) has been estimated by generating synthetic ground motion considering the point source model coupled with site response analysis. The most vulnerable source was identified from regional seismotectonic map for an area of about 350 km radius around Kolkata. The rock level acceleration time histories at 121 borehole locations in Kolkata for the vulnerable source, Eocene Hinge Zone, due to maximum credible earthquake (MCE) moment magnitude 6.2 were generated by synthetic ground motion model. Soil investigation data of 121 boreholes were collected from the report of Soil Data Bank Project, Jadavpur University, Kolkata. Surface level ground motion parameters were determined using SHAKE2000 software. The results are presented in the form of peak ground acceleration (PGA) at rock level and ground surface, amplification factor, and the response spectra at the ground surface for frequency 1.5 Hz, 3 Hz, 5 Hz and 10 Hz and 5% damping ratio. Site response study shows higher PGA in comparison with rock level acceleration. Maximum amplification in some portion in KMD area is found to be as high as 3.0 times compared to rock level.

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.