• 제목/요약/키워드: 지하공동

검색결과 664건 처리시간 0.03초

Influence of Underground Water Quality Adjacent to Landfill Site on Hydrogeologic Characteristics of LPG Storage Cavern (매립장 인근 지하수질이 LPG 저장 공동의 수리지질학적 특성에 미치는 영향)

  • Choi, Won-Gyu
    • Journal of Digital Convergence
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    • 제12권8호
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    • pp.283-288
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    • 2014
  • The underground water quality of petroleum products storage cavern is influenced by that of dumping and landfill sites adjacent to cavern. From the chemical analysis of underground water sampled from landfill site, insignificant amounts of As, Cu and Pb were detected in a half of test samples while Cd, Hg, $Cr^{6+}$, $CN^-$, TCE, PCE and Phenol were not detected in all samples. All measurements of $COD^{Mn}$ were below $8.0mg/{\ell}$ that can be negligible for the contamination by organic matters. The total bacteria counted from 1st and 2nd microbiological analysis were $94.84{\times}10^4cells/m{\ell}$ and $146.26{\times}10^{-4}cells/m{\ell}$, respectively, and all counts of the sulfate reducing bacteria were less than $2cells/m{\ell}$. It can be suggested that the water quality adjacent to storage cavern can also be studied to improve the reliability of hydrogeologic stability of storage cavern.

Thermodynamic Energy Balance Analysis of Underground Lined Rock Caverns (LRC) for Compressed Air Energy Storage (CAES) (복공식 지하 압축공기에너지 저장공동의 열역학적 에너지수지 분석)

  • Kim, Hyung-Mok;Park, Do-Hyun;Ryu, Dong-Woo;Choi, Byung-Hee;Song, Won-Kyong
    • Tunnel and Underground Space
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    • 제21권4호
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    • pp.297-306
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    • 2011
  • In this paper, we performed thermodynamic energy balance analysis of the underground lined rock cavern for compressed air energy storage (CAES) using the results of multi-phase heat flow analysis to simulate complex groundwater-compressed air flow around the cavern as well as heat transfer to concrete linings and surrounding rock mass. Our energy balance analysis demonstrated that the energy loss for a daily compression and decompression cycle predominantly depends on the energy loss by heat conduction to the concrete linings and surrounding rock mass for a sufficiently air-tight system with low permeability of the concrete linings. Overall energy efficiency of the underground lined rock caverns for CAES was sensitive to air injection temperature, and the energy loss by heat conduction can be minimized by keeping the air injection temperature closer to the ambient temperature of the surroundings. In such a case, almost all the heat loss during compression phase was gained back in a subsequent decompression phase. Meanwhile, the influence of heat conductivity of the concrete linings to energy efficiency was negligible.

Detection of Limesilicate Cavities by 3-D Electrical Resistivity Survey (3차원 전기비저항탐사에 의한 석회규산염암의 공동탐지)

  • Park, Sam-Gyu;Kim, Chang-Ryol;Son, Jeong-Sul;Kim, Jung-Ho;Yi, Myeong-Jong;Cho, Seong-Jun
    • Economic and Environmental Geology
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    • 제39권5호
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    • pp.597-605
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    • 2006
  • In this study, we examined the applicability of 3-D electrical resistivity survey to detect underground cavities within ground subsidence area at the field test site, located at Yongweol-ri, Muan-gun in Korea. Underground cavities are widely present within the limesilicate bedrock overlain by the alluvial deposits in the area of the test site where the ground subsidences have occurred in the past. The limesilicate cavities are mostly filled with groundwater and clays in the test site. Thus, cavities have low electrical resistivity compared to the surrounding host bedrock. The results of the study have shown that the zones of low resistivity correspond to the zones of the cavities identified in the boreholes at the test site, and that the 3-D electrical resistivity survey is very effective to detect underground cavities.

Restoration Efficiency Analysis of Expansive Material Implemented Trenchless Underground Cavity Restoration Method Varying Number and Location of Bore Holes (팽창재료를 이용한 지하 공동 비개착 복구공법에서 천공 개수 및 위치에 따른 복구효율 분석)

  • Choi, Byeong-Hyun;Lee, Kicheol;Lee, Junwon;Kim, Dongwook
    • Journal of the Korean Geosynthetics Society
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    • 제18권4호
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    • pp.25-37
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    • 2019
  • The conventional representative underground cavity restoration methods, which are mainly open-cut methods, require high cost and long period of time for the restoration. Therefore, various trenchless restoration methods have been proposed to improve these disadvantages. The underground cavity restoration method using the expansive material proposed in this paper is one of the trenchless methods. This method fills the underground cavity with high quality backfill soils through the small hole(s) at asphalt layer and compacts backfill soils by insertion of the expansive material within the cavity. In this study, the restoration method using expansive material was constructed in acrylic chamber. The restoration efficiency of the method was analyzed by the fill ratio and degree of relative compaction according to the location and number of bore holes. As a result of the experiment, the restoration efficiency and the optimum construction location were found to be irrelevant.

Hydraulic Analysis of Air-core Patterns with Various Discharge and Improving Inlet Part of the Underground Bypass Model (유량변화와 지하방수로 유입구모형의 개선에 따른 공기공동양상의 수리학적 분석)

  • Park, Sung Won;Kim, Hyung-Jun;Rhee, Dong Sop
    • Proceedings of the Korea Water Resources Association Conference
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    • 한국수자원학회 2016년도 학술발표회
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    • pp.369-369
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    • 2016
  • 홍수피해 저감을 위한 지하방수로나 지하저류지 등은 홍수 방어를 위한 도심 내의 토지 확보 부담을 줄이며, 집중 호우 발생 시 내수를 초기에 신속하게 배제하여 제내지 침수 피해를 줄이는데 효율적으로 활용된다. 미국 및 일본, 홍콩과 같은 외국에서는 이미 지하방수로 및 지하저류지를 활용한 홍수피해 저감방안을 수립하여 활용하고 있으며, 최근 국내에서도 치수 계획 수립 시 지하방수로 혹은 지하저류지 시설 도입이 활발히 검토되고 있으나 적용사례가 전무하여 제반기술이 부족하고 많은 시행착오가 예상된다. 제반설계기술의 경우는 구조적인 방안이 모색되어야 하며 대표적으로, 지하방수로 유입구 형상이, 동일한 흐름조건에 대한 유량배제효율에 가장 지배적인 영향인자로 알려진 바 있으며 다양한 유입구 형상설계방안이 기존 실험적 연구 및 외국 설계지침에 제안된 바 있다. 지하방수로는 접근 수로를 통해 유입된 유량이 유입구를 지나며 가속되어 와류 흐름을 형성하며 수직 갱도로 유입되는 구조를 갖기 때문에 지하방수로의 방류 효율을 높이기 위해서는 유입구에서 흐름 특성을 파악하는 것이 중요하다. 이때 유입흐름특성이 사류일 경우 혹은 급격하게 유입 유량이 많아지는 경우 수직 갱도 내에 공기 공동이 형성되어 구조물 파손, 와류의 발생으로 인한 배제효율 감소 등의 피해를 야기할 수 있으므로 수리학적으로 규명할 필요가 있다. 따라서 본 연구에서는 지하방수로의 기존 유입구형상에 대한 장단점을 비교하고, 개선점을 적용하여 수리모형을 제작하여 개수로 실험장치에 설치하고 다양한 유입흐름조건에 따라 수리실험을 수행하였다. 그 결과 유입흐름조건에 따라 발생하는 유입구의 공기 공동의 발달 및 소멸 그리고 규모변화를 정량적으로 분석하여, 유입부의 가능 단면적이 큰 수직갱도인 경우, 유량배제 효율이 감소되는 분석결과에 적절하게 일치하였으며, 본 연구결과는 향후 지하방수로 설계의 제반기술의 수립 시 효율적인 활용이 가능하다.

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Evaluation of Performance of Expansive Material for Restoration of Underground Cavity and Stress Release Zone (지하공동 및 이완영역 복구를 위한 팽창성 재료의 성능 평가)

  • Lee, Kicheol;Choi, Byeong-Hyun;Bak, Jongho;Kim, Dongwook
    • Journal of the Korean Geosynthetics Society
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    • 제17권4호
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    • pp.141-155
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    • 2018
  • Recently, the number of ground subsidence resulting from underground cavity has been increased. Accordingly, the importance of restoration of stress release zone around the underground cavity has been emphasized. The stress release zone is composed of low density soils having extremely low stiffness and degree of compaction, which can lead to additional cavity expansion and collapse of overlying ground. Therefore, in this study, the suitability of restoration method of underground cavity using expansive material for reinforcement of stress release zone around the cavity is verified. The basic physical properties and expansion characteristics of the expansive material were examined. The experiment equipment capable simulating of stress release zone was developed and is used to investigate the effect of expanding material on stress release zone. The stress release zone was simulated using the spring in numerical analysis. The factors of the volume ratio of the underground cavity to the expansion material, the degree of stress relaxation, and the shape of the cavity were varied in numerical simulations, and the behavior of stress release zone was analyzed based on the numerical analysis results. Analysis variables are factors that affect each other. Also, filling of underground cavity and capacity of restoration of stress release zone were confirmed when the expansive material was inserted into underground cavity.

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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    • 제21권9호
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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.

Numerical Study for Prediction of Rock Falls Around Jointed Limestone Underground Opening due to Blast Vibration (발파진동에 의한 절리암반 지하공동의 낙석발생 예측에 관한 수치해석적 연구)

  • Kim, Hyon-Soo;Kim, Seung-Kon;Cho, Sang-Ho
    • Explosives and Blasting
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    • 제34권3호
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    • pp.10-16
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    • 2016
  • Recently, transition from open pit to underground mining in limestone mines is an increasing trend in Korea due to environmental issues such as noise, dust and vibrations caused by crushers and equipment. The severe damages in the surrounding rock mass of underground opening caused by explosive blasting may lead to rock fall hazards or casualties. It is well known that variables which mainly affect blast-induced rock falls in underground mining are: blast vibration level, joint orientation and distribution and shape of the cross sections of underground structures. In this study, UDEC program, which is a DEM code, is used to simulate blast vibration-induced rock fall in underground openings. Variation of joint space, joint angle and joint normal stiffness was considered to investigate the effect of joint characteristics on the blast vibration-induced rock fall in underground opening. Finally, jointed rock mass models considering blast-induced damage zone were examined to simulate the critical blast vibration value which may cause rock falls in underground opening.

A study on development of the high-flowable filling material and application in the old tunnel (터널 배면공동 뒤채움재 개발과 노후터널의 적용에 관한 연구)

  • Ma, Sang-Joon;Seo, Kyoung-Won;Bae, Gyu-Jin;An, Sang-Chul;Im, Kyung-Ha
    • Journal of Korean Tunnelling and Underground Space Association
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    • 제4권3호
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    • pp.195-205
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    • 2002
  • Most tunnel damage such as cracks or leakage which exist in tunnel liner commonly, is caused by the cavities that exist behind the tunnel liner, through the tunnel safety inspections. These cavities were analysed to check if they affect the stability of tunnels. This study is on the development of the controlled low-strength and flowable filling material which an be applied to the cavity behind the tunnel lining. The backfilling material studied here is crushed sand and stone-dust which is in cake-state and is a by-product obtained in the producing process of aggregate. Varying the compound mixing ratio, laboratory tests of compression test and chemical analyses were carried out. In addition, the material was applied to an old tunnel for the performance assessment.

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A Case Study of Correlation between Inflows and Geological Structures around Underground Caverns (지하 유류저장 공동의 지질구조와 공동누수량 상호관계에 관한 사례)

  • 전한석
    • The Journal of Engineering Geology
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    • 제10권1호
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    • pp.79-93
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    • 2000
  • When caverns are excavated, it is very important to understand the distribution and charateristics of geological structures because the structures have an significant effect on grouting, rock reinforcement, and groundwater flow, etc. The main water bearing fractures have an orientation of N50~60W and these fractures are known as tension fractures. Their orientation coincides with a long elliptical axis ofpumping test, and they cross the tension fractures of N10~30E. They have typical fracture systems ofrhombic type in this area.

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