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Wu Jimin, A. Mahtab. 1999: OVERBREAK PREDICTION FOR OPENINGS IN JOINTED ROCKMASS. JOURNAL OF ENGINEERING GEOLOGY, 7(1): 3-8.
Citation: Wu Jimin, A. Mahtab. 1999: OVERBREAK PREDICTION FOR OPENINGS IN JOINTED ROCKMASS. JOURNAL OF ENGINEERING GEOLOGY, 7(1): 3-8.

OVERBREAK PREDICTION FOR OPENINGS IN JOINTED ROCKMASS

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  • Received Date: 1998-03-23
  • Rev Recd Date: 1998-04-16
  • Publish Date: 1999-01-22
  • This article emphasizes a prediction of overbreak,the unstable wedge, for openings in jointed rock mass. Firstly, the basic concept of overbreak in opening, its main cause, and the estimating method are described. Secondly, the calculation softwares and their characteristics for opening overbreak are analyzed and compared. Then, a calculation software edited by the authors is introduced. Finely,a calculation case is given, from field investigation to statistical analysis of the parameters, a general formula for an unstable wedge is inferred; after that, the main factors affecting the unstable wedge are shown. The prediction result provides a basis for treating the overbreak.
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    [4]  W u.J.1996.A nal ysis an d Est im at ion of Param et er s of J oin ts and of t he W edge S tabili ty in t he R oof of a Cir cular T unn el.A Collaborati on Project R epor t.R 109W u.

    [5]  Zh ang X.&L iao G.1990.T ech nical N ot e Est imat ion of Conf idence Bounds f or M ean Tr ace Len gth of Dis contin ut ies U s ing Scanl ine Sur veys.Int.J.R ock M ech.M in.Sci.&Geomech.A bst r.27(3).207~212

    [6]  Sof iano.A.I.1986.St abil it y of Rock Wedges in Tu nnel Roof s.Int.J.Rock M ech.M in.S ci.&Geomech.A bst r.23(2).119~130.

    [7]  M orinean A.1995.A ide M moire St at is tique.Cisia C erest a.285.

    [8]  吴继敏,周志芳.1997.水利科技的世纪曙光.水利系统首届青年学术交流会优秀论文集.圆形洞室顶部楔形体稳定性的概率评价.北京:中国科学技术出版社,198~202.

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