• Title/Summary/Keyword: 석회공동

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A Case Study of Ground Subsidence in a Groundwater-saturated Limestone Mine (지하수로 포화된 석회석광산의 지반침하 사례연구)

  • Choi, Woo-Seok;Kim, Eun-Sup;Kang, Byung-Chun;Shin, Dong-Choon;Kim, Soo-Lo;Baek, Seung-Han
    • The Journal of Engineering Geology
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    • v.25 no.4
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    • pp.511-524
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    • 2015
  • Groundwater causing subsidence in limestone mines is uncommon, and thus relatively poorly investigated. This case study investigated the cause and possibility of future subsidence through an evaluation of ground stability at the Samsung limestone mine, Chungcheongbuk-do. The ground near the mine area was evaluated as unstable due to rainfall permeation, and subsidence in the unmined area resulted from groundwater level drawdown. Future subsidence might occur through the diffusion of subsidence resulting from the small thickness of the mined rock roof, fracture rock joints, and poor ground conditions around the mine. In addition, the risk of additional subsidence by limestone sinkage in corrosion cavities, groundwater level drawdown due to artificial pumping, and rainfall permeation in the limestone zone necessitates reinforcements and other preventative measures.

A Study on the Cause Analysis of the Ground Subsidence in Limestone Mine (석회석 광산에서 발생한 지반침하에 대한 원인 분석 연구)

  • Lee, Sangeun;Jeong, Gyo-Cheol
    • The Journal of Engineering Geology
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    • v.30 no.4
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    • pp.497-514
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    • 2020
  • This study investigated the causes of large-scale ground subsidence in the upper part of mining cavities of the Samdo limestone mine, Samcheok city, Gangwondo, Korea. Geological and electrical resistivity surveys were undertaken on the collapsed slope of the mountain and in the mine tunnel where subsidence occurred, with geotechnical evaluations and numerical analysis. It is concluded that wide mining cavities, with irregular pillars in unstable rock masses hosting discontinuities, weathered over time, resulting in subsidence occurring along a fault plane due to increasing ground stress.

A Study on Stability Analysis of Large Underground Limestone Openings considering Excavation Damaged Zone (굴착손상영역을 고려한 대형 석회석 갱내채광장의 안정성 분석 연구)

  • Kwon, Min-Hyuk;Choi, Sung-Oong;Kim, Chang-Oh
    • Tunnel and Underground Space
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    • v.26 no.2
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    • pp.131-142
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    • 2016
  • Investigation for rock joints, inspection for rock core, and laboratory tests for rock specimens, in this study, have been performed for identification of the extent and properties of Excavation Damaged Zone in a underground limestone mine, which plans to enlarge the size of openings to improve the production rate. Properties of EDZ and surrounding rock masses have been used numerically for discontinuum analysis, and it is concluded that the effect of EDZ can be increased with increasing the opening size and a blasting pattern of high precision can be suggested for the counterplan.

Development of the Environmentally Friendly Filling Material for the Underground Cavities using the Rock-dust and an Assessment on Filling and Material Characteristics (석분토를 이용한 지하공동의 친환경적 충전재 개발과 충전 및 재료특성 평가)

  • Ma Sang-Joon;Kim Dong-Min
    • Journal of the Korean Geotechnical Society
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    • v.21 no.9
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    • pp.35-44
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    • 2005
  • Recently, underground cavities such as limestone cavity and abandoned mine give rise to a lot of damage in SOC facilities. But there are many difficult problems such as delay of the working terms and enormous economic losses in finding a new method and changing construction design. In this study, a new filling material for underground cavities was developed using the stone-dust classified as industry waste polluting environment. As a result of test, filling material properties was that a compressive strength was $34{\~}60\;kgf/cm^2$, a change ratio in length was $0.268{\~}0.776\%$ and water absorption was $34.3{\~}46.9\%$. Also as a result of suspended mass test and pH test, it was confirmed that the developed filling material has a characteristic of non-separating in water and it was an environmentally friendly material.

An Analysis of Cyber Communities based on Apartment Residential Space: The Realities of Internet Home Pages of Apartment Complexes (아파트 사이버공동체의 가능성과 한계 -아파트 홈페이지의 운영 실태를 중심으로-)

  • Yim, Seok-Hoi
    • Journal of the Korean association of regional geographers
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    • v.11 no.6
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    • pp.585-606
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    • 2005
  • The rapid development of Information technology and the Internet has brought about a new phase like building cyber communities in Apartment residential space. This study empirically considers the possibility and limit of cyber communities based on apartment residential space through analysing apartment Internet home pages. The analysing results show us the fact that apartment cyber communities are less satisfied than theoretical expectation. However, they have some possibilities as on-line communities. First of all, the most important factor is off-line community activities in realizing the possibility of cyber community at least in apartment residential space.

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한국의 지질과 자연동굴

  • 홍시환;유재신
    • Journal of the Speleological Society of Korea
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    • v.16 no.17
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    • pp.23-26
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    • 1988
  • 석회동굴은 Karst지형 지역에서 지하 형성물로 나타나는 공동지역으로, 이 공동화된 공간에 2차적으로 석순, 석주, 종유석등이 침전되어 생긴 동굴이다. 이런 Karst 지형은 석회암지층에서 용식작용으로 생겨나는데, 우리나라에서는 황해도의 서흥, 신막, 수안, 곡산 물질지역과 평안남도의 덕천, 성천, 강동지방, 그리고 강원도의 삼척, 영월, 평창, 정선, 명주지방, 충청북도의 단양, 제천, 괴산지역 그밖에 경상북도의 울진 지역에도 분포한다.(중략)

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Numerical Investigation on Load Supporting Mechanism of a Pile Constructed above Underground Cavity (공동이 존재하는 암반에 시공된 말뚝기초의 하중지지 메카니즘에 관한 수치해석 연구)

  • Choi, Go-Ny;Yoo, Chung-Sik
    • Journal of the Korean Geotechnical Society
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    • v.27 no.1
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    • pp.5-16
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    • 2011
  • This paper presents the results of a three-dimensional finite element analysis on load supporting mechanism of pile constructed above underground cavity in limestone rock formation. Considering a wide range of cavity conditions, the behavior of pile was studied using the bearing capacity, rock yielding pattern, stress distribution and deformation of pile head and the cavity. The results indicate that the load transfer mechanism of pile, rock yielding pattern and the reduction of bearing capacity of pile significantly vary with the location, size and length of cavity. Based on the results, graphical solutions defining the reduction of the bearing capacity with specific cavity conditions were suggested.

Underground Mine Design and Stability Analysis at a Limestone Mine (석회석광산의 갱내채광설계 및 안정성평가)

  • Koo, Chung-Mo;Jeon, Seok-Won;Lee, In-Woo
    • Tunnel and Underground Space
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    • v.18 no.4
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    • pp.243-251
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    • 2008
  • Recently, the mining methods are changing from surface mining to underground mining because of the increment of the environmental issues and legal regulations. Therefore, the stability of underground openings is a major concern for the safety and productivity of mining operations. In this paper, a survey of structural geology and discontinuities were carried out at a limestone mine. The relevant mechanical properties of rocks were determined by the laboratory tests and rock mass classifications (RMR and Q-system) for the mine design and input data for the stability analysis. The dimensions of unsupported span for underground openings and pillar were decided based on the RMR values of rock mass classifications. The stability analysis for the suggested mine design was examined through the empirical methods (stability graph method and critical span curve) and 3-D numerical analysis (Visual-FEA).

Restoration of Local Community Based on Apartment Residential Space (아파트 주거공간에 기초한 지역공동체 형성에 관한 연구)

  • Yim, Seok-Hoi;Lee, Chul-Woo;Jeon, Hyeong-Soo
    • Journal of the Korean association of regional geographers
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    • v.9 no.3
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    • pp.314-328
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    • 2003
  • This study aims at exploring the restoration of local community based on apartment residential space through the questionnaire survey of residents and community movement organizers. Apartment residential space has a serious limit to the restoration of local community due to the physical feature of closing compartment. But, at the same time, it has many communal elements as well. The survey shows that residential community movements are developing beyond compensatory community movement, although it is yet to be an ideal type of local community in a nonnative sense. Generally, apartment women's associations, together with the representative commission of residents, play a key role in residential community movements. Particularly, community movement activities have a positive effect on improving the neighborhood relationship. Residents themselves think so as well. This study implies the value and possibility of apartment residential movement as an alternative strategy against contemporary urban problems.

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A Study on the Failure Cause of Large Scale Rock Slope in Limestone Quarries (석회석 광산에서 발생한 대규모 암반사면의 붕괴원인 분석에 관한 연구)

  • Lee, Sang-Eun;Kim, Hak-Sung;Jang, Yoon-Ho
    • Tunnel and Underground Space
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    • v.24 no.4
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    • pp.255-274
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    • 2014
  • The target of this study is large scale rock slope collapsed by around 7 pm on August, 2012, which is located at ${\bigcirc}{\bigcirc}$ limestone quarries of Gangneung city, Gangwondo. The slope prior to the collapse is formed as the height of about 200 m and the average inclination of $45^{\circ}$. The estimated amount of the collapse is about $1,500,000m^3$ with respect to the slope after the collapse. Geotechnical and field investigations such as boring, geophysical prospecting, surface geological survey, geological lineaments, borehole imaging, metric 3D imaging, experimental and field test, mining work by year, and daily rainfall were performed to find the cause of rock slope failure. Various analyzes using slope mass rating, stereonet projection, limit equilibrium method, continuum and non-continuum model were conducted to check of the stability of the slope. It is expected that the cause of slope failure from the results of various analysis and survey is due to the combined factors such as topography, rainfall, rock type and quality, discontinuities, geo-structural characteristics as the limestone cavity and fault zones, but the failure of slope in case of the analysis without the limestone cavity is not occurred. Safe factor of 0.66 was obtained from continuum analysis of the slope considering the limestone cavity, so the ultimate causes of slope failure is considered to be due to the influence of limestone cavity developed along fault zone.