Pipe network model for unconfined seepage analysis in fractured rock masses

Feng Ren, Guowei Ma, Yang Wang, Lifeng Fan

    Research output: Contribution to journalArticle

    34 Citations (Scopus)

    Abstract

    An efficient unconfined seepage analysis method is developed for analysing fluid flow in fractured rock mass. The proposed method discretises both porous rock matrix (a low permeability medium) and discrete fracture networks (a high permeability medium) as permeable pipe networks. A finite volume based approach is used to determine the equivalent flow parameters in the undirected pipes for the porous rock matrix such that seepage analysis in a fractured rock mass is carried out in a consistent mathematical framework which gives excellent computational accuracy and efficiency. Using an auxiliary boundary method, pipe networks in the vicinity of the phreatic surface can be adapted in unconfined seepage problems. Validated by finding the phreatic surface in dam structures, it has been found that the fracture orientation, hydraulic aperture, fracture set number and fracture distribution can affect the phreatic surface significantly in a fractured rock mass. The proposed method is applied to investigate the effectiveness of the water curtain system in a water-sealed underground crude oil storage cavern. Grouting effect can also be conveniently investigated by the unified pipe network system. Results show that the proposed method is robust in seepage analysis for both fractured and porous rock masses.

    Original languageEnglish
    Pages (from-to)183-196
    Number of pages14
    JournalInternational Journal of Rock Mechanics and Mining Sciences
    Volume88
    DOIs
    Publication statusPublished - 1 Oct 2016

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