• Title/Summary/Keyword: 3차원 지반모델링

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The Case Study on Application of 3 Dimensional Modeling Method with Geophysical Data (물리탐사 자료에 대한 3차원 지반 모델링 적용 사례 연구)

  • Heo, Seung;Park, Joon-Young;Do, Jung-Lok;Yoo, In-Kol
    • Geophysics and Geophysical Exploration
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    • v.11 no.3
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    • pp.221-229
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    • 2008
  • The three dimensional model method is widely applied in resource development for feasibility study, mine design, excavation planning and process management by constructing the database of various data in 3 dimensional space. Most of geophysical surveys for the purpose of engineering and resource development are performed in 2 dimensional line survey due to the restriction of the field situation, technical or economical situation and so on. The acquired geophysical data are used as the input for the 2 dimensional inversion under the 2 dimensional assumption. But the geophysical data are affected by 3 dimensional space. Therefore in order to reduce the error caused by 2 dimensional assumption, the 2 dimensional inversion result must be interpreted considering the additional information such as 3 dimensional topography, geological structure, borehole survey etc. The applicability and usability of 3 dimensional modeling method are studied by reviewing the case study to the geophysical data acquired in field of engineering and resource development.

Development of the Noise Elimination Algorithm of Stereo-Vision Images for 3D Terrain Modeling (지반형상 3차원 모델링을 위한 스테레오 비전 영상의 노이즈 제거 알고리즘 개발)

  • Yoo, Hyun-Seok;Kim, Young-Suk;Han, Seung-Woo
    • Korean Journal of Construction Engineering and Management
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    • v.10 no.2
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    • pp.145-154
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    • 2009
  • For developing an Automation equipment in construction, it is a key issue to develop 3D modeling technology which can be used for automatically recognizing environmental objects. Recently, for the development of "Intelligent Excavating System(IES), a research developing the real-time 3D terrain modeling technology has been implemented from 2006 in Korea and a stereo vision system is selected as the optimum technology. However, as a result of performance tests implemented in various earth moving environment, the 3D images obtained by stereo vision included considerable noise. Therefore, in this study, for getting rid of the noise which is necessarily generated in stereo image matching, the noise elimination algorithm of stereo-vision images for 3D terrain modeling was developed. The consequence of this study is expected to be applicable in developing an automation equipments which are used in field environment.

Electrical Resistivity Survey at the Ground with Micro-subsidence by Excessive Pumping of Groundwater (지하수 과잉양수에 따른 미세 지반변형 지역에서의 전기비저항 탐사)

  • Song Sung-Ho;Lee Kyu-Sang;Yong Hwan-Ho;Kim Jin-Ho
    • Geophysics and Geophysical Exploration
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    • v.7 no.3
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    • pp.197-206
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    • 2004
  • Because the minute displacement of ground accompanied by excessive pumping of groundwater at specified site is mainly generated from ill-balancing of water budget within groundwater basin, It is necessary to monitor the variation of micro-subsidence for a long time at representative points. We made up the conceptual model using two-dimensional electrical resistivity survey and three-dimensional soil profile consisted of loam and sand. In verifying the reliability of this conceptual model using numerical modeling for ground settlement and groundwater flowing, two-dimensional electrical resistivity survey with short distance of electrode following soil sampling with hand auger would be useful for interpreting hydrogeological structure related to the minute displacement of ground consisted of loam and sand.

3차원 유한요소와 Hyperelement 연계에 의한 구형강체기초의 동적강성행렬

  • 진병무;김재관;장승필
    • Proceedings of the Korean Nuclear Society Conference
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    • 1996.05d
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    • pp.398-403
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    • 1996
  • 이 논문에서는 지반과 기초를 일반적인 3차원 유한요소로 모델링하고, 유한요소의 바깥영역은 일반적인 모드의 축대칭 유한요소와 축대칭 Hyperelement를 사용하여 전달경계로 모델링하여, 유한요소와 전달경계의 경계에서 두 요소간의 연계에 의하여 기초에서의 동적강성행렬을 구한다. 이를 위하여 3차원 유한요소와 축대칭 요소간의 연계방법을 제안한다. 제시되는 기초의 동적강성행렬은 x,y,z방향의 병진성분과 x,y,z축에 관한 회전성분의 6자유도로 표현된다. 이 논문에서 사용한 3차원 유한요소와 축대칭 요소의 연계 방법의 검증을 위하여 구형기초와 등가의 강성을 갖는 강체원형기초의 동적강성행렬을 구하고 이를 비교하였다.

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Suggestion on Reasonable Boundary Conditions for Modeling a Tunnel Shield by Displacement Control Method (변위 제어를 통한 터널 쉴드 모델링의 적정 경계조건 제안)

  • Kim, Jeong-Soo;Kim, Moon-Kym
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2011.04a
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    • pp.512-515
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    • 2011
  • 터널 해석은 주로 지표침하와 터널 라이닝 내 단면력 산정에 초점이 맞춰지며 이는 시공단계를 고려한 3차원 수치해석 모델을 이용해 결정할 수 있다. 수치해석 시 shield는 응력 제어, shell element로 모델링하는 방법 등으로 모사될 수 있다. 한편 변위 제어를 통한 쉴드 모사는 shield를 적절한 경계조건으로 처리함으로서, 다른 shield 모사 방법에 비해 모델링 작업을 간소화하고 해석의 효율성을 높일 수 있다. 본 연구에서는 변위 제어에 의한 shield 모사를 위한 적정 경계조건을 제안한다. 이를 위해 시공단계가 고려된 유한요소해석을 사용하여, 쉴드 및 굴착면에서의 경계조건 변화와 이에 따른 지표침하 관측 수행하였다. 제안된 shield 변위 제어로부터 얻어진 해석결과를 이론적인 해와 비교함으로서, 제시된 shield 모델링 방법의 적정성과 지반 거동 변화를 평가하고자 한다. 해석 결과는 지반 모델의 지표침하를 기준으로 관찰되었으며, 변위제어에 의한 결과와 요소에 의한 모델링 결과가 유사하게 얻어짐을 보여준다. 또한 변위제어의 쉴드 모사에서 회전 구속보다 변위 구속 조건에 지배적으로 영향을 받음을 확인하였다.

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Analysis Model of Corrugated Steel Plates for Soil-Metal Box Culverts (지중강판 박스구조물을 위한 파형강판 해석 모델)

  • Choi, Dongho;Lee, Jongsun;Na, Hosung
    • Journal of the Korean GEO-environmental Society
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    • v.11 no.11
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    • pp.5-18
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    • 2010
  • In this paper, a 3-dimensional stiffened plate model for soil-metal box structures is proposed. 3-dimensional stiffened plate model is enable to model corrugated steel plates of soil metal box culverts considering section modulus and section properties of longitudinal and horizontal direction from a corrugated steel plate. Loading conditions which causes maximum displacement and maximum moment according to the step construction stages(a back filling to the top of the plate, a back filling to the maximum depth of cover, and loading of live loads) was applied and the behaviors of the soil metal box culverts was analyzed. Analysis results of 3-dimensional stiffened model were compared with those of 2-dimensional model, 3-dimensional equivalent plate model and 3-dimensional corrugated plate model. As results, the behaviors of 2-dimensional model and 3 dimensional equivalent model are different from 3-dimensional corrugated plate model but the result of 3-dimensional stiffened model has good agreement with that of 3-dimensional corrugated plate model.

A Study on Earth Pressure Calculating Method about Shield TBM Tunnel Segments in the Rock (암반층에서 쉴드 TBM 터널 세그먼트의 작용하중 산정방법에 관한 연구)

  • Chun, Byungsik;Ki, Jungsu;Kang, Taehee;Kwag, Yunehyeong;Byun, Yoseph
    • Journal of the Korean GEO-environmental Society
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    • v.15 no.5
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    • pp.13-21
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    • 2014
  • This study analyzed the differences in the analysis techniques through a comparative analysis of the various segment's modeling techniques of Shield TBM method and proposed reasonable modeling techniques. Also, this study suggested reasonable estimating methods of load to be applicable in the field through the load analysis and three-dimensional finite element analysis by estimating model of rock mass relaxation load. Estimating method of relaxation area by rock mass rating makes no odds of output in subgrade with high rock mass rating, but so the difference of output is large, that is judged to set conservative design off. In estimating result of rock mass relaxation area by three-dimensional analysis relaxation area of subgrade with low-grade soil was predicted to be positioned at medium-range of many methods, in case of designing segment in subgrade with low-grade soil it needs to actively review estimation of relaxation area through three-dimensional analysis reflecting mechanical tunnel excavation.

A Method of Developing a Ground Layer with Risk of Ground Subsidence based on the 3D Ground Modeling (3차원 지반모델링 기반의 지반함몰 위험 지반 레이어 개발 방법)

  • Kang, Junggoo;Kang, Jaemo;Parh, Junhwan;Mun, Duhwan
    • Journal of the Korean GEO-environmental Society
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    • v.22 no.12
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    • pp.33-40
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    • 2021
  • The deterioration of underground facilities, disturbance of the ground due to underground development activities, and changes in ground water can cause ground subsidence accidents in the urban areas. The investigation on the geotechnical and hydraulic factors affecting the ground subsidence accident is very significant to predict the ground subsidence risk in advance. In this study, an analysis DB was constructed through 3D ground modeling to utilize the currently operating geotechnical survey information DB and ground water behavior information for risk prediction. Additionally, using these results, the relationship between the actual ground subsidence occurrence history and ground conditions and ground water level changes was confirmed. Furthermore, the methodology used to visualize the risk of ground subsidence was presented by reconstructing the engineering characteristics of the soil presented according to the Unified Soil Classification System (USCS) in the existing geotechnical survey information into the internal erosion sensitivity of the soil, Based on the result, it was confirmed that the ground in the area where the ground subsidence occurred consists of more than 40% of sand (SM, SC, SP, SW) vulnerable to internal erosion. In addition, the effect of the occurrence frequency of ground subsidence due to the change in ground water level is also confirmed.

Numerical Modelling of Vertical Drains Installed in Soft Deposit under Embankment (성토재 아래의 연약지반에 설치된 연직배수재의 수치모델링)

  • 이승래;김윤태
    • Geotechnical Engineering
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    • v.12 no.6
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    • pp.127-138
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    • 1996
  • The in-situ consolidation behavior of drainage system-installed deposits has three dimensional characteristics. Therefore, for an approximate 2-D plane strain consolidation analysis, it is necessary to convert the 3-D spatial flow of actual cases into the laminar flow simulated by the 2-D plane strain model. . In this paper, in order to properly model the effect of three dimensional characteristics, an equivalent and efficient model has been applied in a finite element technique for the analysis of the drainage system-installed soil deposits. The equivalent two dimensional model involves equivalent permeabilities and drainage widths. To validate the equivalent two dimensional model, three dimensional analyses were per formed by using the ABAQUS program and the results of 3-D analyses were compared with those of the 2-D analyses. By using the proposed equivalent model, one may be able to appropriately predict the consolidation behavior of drainage system-installed soft deposits.

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