Reliability analysis of hydrologic containment of underground storage of liquefied petroleum gas

Xu Gao, E. Chuan Yan, Tian-Chyi J Yeh, Yuli Wang, Yue Liang, Yonghong Hao

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

The objectives of this paper are (1) to introduce a numerical first order method to calculate the gas containment reliability within a heterogeneous, two-dimensional, unlined rock caverns (URCs), and (2) to suggest a strategy for improving the gas containment reliability. In order to achieve these goals, we first analyzed the spatial variability of saturated hydraulic conductivity (Ks) at a field site. We then conducted deterministic simulations to demonstrate the importance of heterogeneity of Ks in the analysis of gas tightness performance of URCs. Considering the uncertainty of the heterogeneity in the real world situations, we subsequently developed a numerical first order method (NFOM) to determine the gas tightness reliability at crucial locations of URCs. Using the NFOM, the effect of spatial variability of Ks on gas tightness reliability was investigated. Results show that as variance or spatial structure anisotropy of Ks increases, most of the gas tightness reliability at crucial locations reduces. Meanwhile, we compare the results of NFOM with those of Monte Carlo simulation, and we find the accuracy of NFOM is mainly affected by the magnitude of the variance of Ks. At last, for improving gas containment reliability at crucial locations at this study site, we suggest that vertical water-curtain holes should be installed in the pillar rather than increasing density of horizontal water-curtain boreholes.

Original languageEnglish (US)
Pages (from-to)12-26
Number of pages15
JournalTunnelling and Underground Space Technology
Volume79
DOIs
StatePublished - Sep 1 2018

Keywords

  • Hydrologic containment
  • Petroleum gas
  • Reliability
  • Saturated hydraulic conductivity
  • Unlined rock cavern
  • Water-certain borehole

ASJC Scopus subject areas

  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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