• Title/Summary/Keyword: LPG storage cavern

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액화석유가스(LPG) 지하저장기지에서의 TSP(Tunnel Seismic Prediction)탐사

  • Cha, Seong-Su
    • Journal of the Korean Geophysical Society
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    • v.5 no.2
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    • pp.75-86
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    • 2002
  • A TSP(Tunnel Seismic Prediction) survey which is modified VSP(Vertical Seismic Profiling) survey applied in tunnel was carried out at Pyongtaek and Incheon liquefied petroleum gas(LPG) storage cavern during excavation. The TSP survey in Pyongtaek LPG storage cavern which is located below Namyangho was performed to confirm the location and orientation of the fault detected at pre-investigation stage. The TSP survey was carried out in access tunnel, construction tunnel, and watercurtain tunnel to characterize 3 dimensional figure of the fault. The results of TSP survey are compared four in vestigation boreholes drilled in shelter of access tunnel. The fault was also detected by borehole survey and the location was coincided with the result of TSP survey. Depending on the result of TSP survey and core logging, the design such as cavern layout and length was changed. Another TSP survey was performed in Incheon LPG storage cavern which is located below sea. Because of poor geological information at pre-investigation stage and suffering from heavy leakage of groundwater, the TSP survey to detect fracture zone was carried out. The support and grouting design was reflected by the result of TSP survey.

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Characteristics of Seepage Water and Groundwater in Incheon Coastal LPG Storage Cavern (인천 해안 저장공동 유출수 및 주변 지하수의 수질특성)

  • Jo, Yun-Ju;Lee, Jin-Yong;Choi, Mi-Jung;Cho, Byung-Wook
    • The Journal of Engineering Geology
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    • v.20 no.1
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    • pp.1-12
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    • 2010
  • The objective of this study was to examine the hydrogeochemical and microbiological characteristics for stable maintenance of coastal LPG storage cavern. Cavern seepage water and groundwater in the vicinity of the LPG storage cavern were sampled and analyzed (February, May, August and October 2007). Groundwater samples of propane cavern showed high pHs of 8.1~12.4 due to dissolution of cement grouting materials that had been applied during the well and cavern construction. The EC values showed distinctive seasonal variation. The negative ORP indicated reduced condition. The seepage and surrounding groundwater are classified as Na-Cl type, which represents seawater effects. All of aerobic bacteria, anaerobic bacteria, slime forming bacteria and sulfate reducing bacteria were less than 500 CFU/mL, which indicated that there was no abrupt increase of bacteria in the cavern. Therefore there exist no hydrochemical symptoms to indicate unstable conditions of the cavern operation. However, regular and continuous monitoring is essentially required.

Parameter estimation for identification on cause of drawdown around underground LPG storage cavern (지하 LPG저장공동 주변의 지하수위 강하 원인규명을 위한 파라미터추정)

  • Han, Il-Yeong;Lee, Dae-Hyuck;Lee, Jung-Eun;Jung, Kwang-Pil
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 1998.11a
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    • pp.76-80
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    • 1998
  • In order to identify the cause of ground water drawdown of a piezometer installed around the LPG storage cavern, parameter estimations were conducted by inverse and forward numerical models. An inverse model, SK-EST developed by SK Engineering & Construction Co., Ltd.(SKEC,1997) was performed to estimate the change of the hydraulic conductivity. It was verified by the commercial forward model, AQUA3D (VATNASKIL,1995). The simulation results showed that the hydraulic diffusivity of the rock mass between the piezometer and the cavern had been increased and the change rate of the hydraulic head had been abruptly increased in response to the change of the operation pressure. Finally the statistical analysis for observed data showed the increase of the change rate of the hydraulic head and thus proved the applicability of SK-EST.

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A Numerical Model of Inverse Analysis for Estimating the Clogging in the Underground LPG Storage Cavern (지하 LPG 저장공동에서의 Clogging 추정을 위한 역해석 수치모형)

  • 강태섭;한일영
    • Journal of the Korean Society of Groundwater Environment
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    • v.4 no.3
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    • pp.161-167
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    • 1997
  • A numerical model (SK-EST) for estimating hydraulic conductivity using monitoring data of underground LPG storage cavern was developed. The model calculates hydraulic conductivity from matrix equation which is established from the distribution of hydraulic potential. To verify the applicability of this model, an inverse analysis was performed using the monitoring data of pressure cell of an operating underground LPG storage cavern. And also using the water pressure parker test data which were obtained to look over the operation capability of pressure cell, conductivity variation with depth was estimated using the developed numerical model (SK-EST) and was compared with in situ results.

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An Experimental Study on Groundwater Head, Injection Water Flowrate and Seepage Water Flowrate under Clogging State of Underground Storage (LPG 지하저장기지 수평 수벽공의 클로깅 현상 발생시 지하수위 및 주입수량, 삼출수량의 변화양상에 관한 실험적 연구)

  • Han Choong-Yong;Kang Joe M.
    • Journal of the Korean Institute of Gas
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    • v.1 no.1
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    • pp.101-105
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    • 1997
  • When the water curtain system is employed to keep the liquefied gas in the underground storage cavern, clogging is observed in borehole. Since this phenomenon causes serious difficulties in managing LPG storage cavern, it needs to detect the degree of clogging accurately under various circumstances. Thus, in this study the active factors of clogging, that is, groundwater head, injection water flowrate, and seepage water flowrate, were investigated experimentally using a physical model. Experimental results show that groundwater head around storage cavern increases as cavern Pressure increases, while it decreases as clogging becomes severe. The pressure in storage cavern is required to reduce up to atmospheric pressure in order to detect and identify the degree of clogging more accurately. The decrease of uroundwater head due to clogging slows down as the pressure in borehole increases. As amounts of suspended matters in injected water increase, both injection water flowrate and seepage water flowrate decrease linearly with time, and the flowrate of injection water drops rapidly compared with seepage water flowrate.

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Application of A Discrete Fracture Flow and Mass Transport Simulation Technique Assessing Tightness Criteria for Underground LPG Storage Cavern (지하 LPG 저장공동의 기밀성평가를 위한 분리열극개념의 지하수유동 및 용질이동 모형 모의기법 적용)

  • 한일영;조성만;정광필
    • The Journal of Engineering Geology
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    • v.5 no.2
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    • pp.155-165
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    • 1995
  • Fluid flow studies of fractured rocks require three-dimensional modeling of the fracture system. The stochastic discrete fracture models constructed by Monte Carlo simulation technique were applied to the analysis of groundwater flow and mass transport in fractured rock for the assessment of tightness criteria of underground LPG storage cavern. The parameters that most affect the conceptual discrete fracture modeling proved either fracture orientation or size and on the fract'lre flow interpretation proved conductive fracture intensity. The fracture transmissivity played important role in solute transport in fractured rock simulated by particle tracking approach. It was partly recognized that the calibrated stochastic discrete fracture model can be used for the tightness criteria of underground LPG storage cavern.

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Prediction of Leachate Migration from Waste Disposal Site to Underground LPG Storage Facility and Review of Contamination Control Method by Numerical Simulations (수치모의를 통한 지하 LPG 저장시설에 인접한 폐기물매립지에서의 침출수이동 예측 및 제어공법 검토)

  • 한일영;서일원;오경택
    • Journal of the Korean Society of Groundwater Environment
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    • v.3 no.2
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    • pp.51-59
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    • 1996
  • In case waste disposal site is to be constructed close to the underground facilities such as LPG storage cavern which is completely maintained by groundwater pressure, it is generally requested that the possibility on leachate contamination of cavern area be reviewed and the countermeasure, if it is estimated cavern area is severely affected by leachate, be taken into consideration. Prediction was performed and leachate control plan was made using by analytical and the numerical analysis on the leachate migration which is likely to happen at the area between the proposed waste disposal site and the underground LPG storage cavern located at the U petrochemical complex. Analytical solutions were obtained by the conservative mass advection-diffusion equation and the effect of advection and dispersion factor on the leachate migration was reviewed through peclet number calculation and the functional relationship between the factors and leachate transport velocity was established, which leads to enable us to predict the leachate transport velocity without difficulties when different parameters (factors) are used for analytical solution. Numerical solutions were obtained by FEM using AQUA2D which is for the simulation of groundwater flow and contaminant transport. 3-D discrete fracture models were simulated and fracture flow analysis was performed and feasibility study on the water-curtain system was conducted through the fracture connectivity analysis in rock mass. As results of those analyses, it was interpreted that the leachate would trespass on the LPG storage cavern area in 30 years from the proposed wate disposal site and the vertical water-curtain system was effective mathod for the prevention of leachate's migration further into the cavern area.

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An Application Case on Project Management Technology in LPG Storage Cavern Project (프로젝트관리기법의 LPG Storage Cavern Project 적용사례)

  • 신용훈;김호영;이철욱
    • Magazine of korean Tunnelling and Underground Space Association
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    • v.4 no.3
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    • pp.23-37
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    • 2002
  • 프로덕트 관리를 통하여 발주자에게 제공해야 하는 산출물에 대한 구체적인 특성 및 제원이 규명되면, 프로젝트 관리를 통하여 발주자에게 제공해야 하는 산출물에 대한 구체적인 작업 및 자원이 규명된다. 또한 프로젝트 관리는 설정된 공기, 공사비, 품질 등의 프로젝트 목표를 만족시킴으로써 그 역할을 수행하게 된다. 최근 국내외 프로젝트의 입찰 과정을 볼 때 발주자의 요구사항이 점점 까다로워지고 제약 조건은 더욱 강화되고 있는 추세이다. 따라서 몇몇 사람의 특화된 감각이나 과거 수행된 계획의 답습만으로는 이러한 추세에서 제대로 대응하여 프로젝트 목표를 달성하는 것은 매우 힘든 실정이다. 본 기술보고에서는 프로세스를 통하여 프로젝트 계획을 개발함으로써 과학적이며 체계적인 프로젝트 관리가 이루어질 수 있음을 보여주고자 한다.

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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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    • v.12 no.8
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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.