PROCEDURE FOR BACK ANALYSIS OF SLOPE FAILURES IN CLOSELY JOINTED ROCK MASSES

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DEHKHODA S.; MEMARIAN H.; MAHINRAD A.A.F.

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Journal: Year:2007 | Volume:41 | Issue:3 (105) Page(s): 309-317

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Title

PROCEDURE FOR BACK ANALYSIS OF SLOPE FAILURES IN CLOSELY JOINTED ROCK MASSES

Author(s)

DEHKHODA S. | MEMARIAN H. | MAHINRAD A.A.F. | Issue Writer Certificate

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Abstract

Where closely jointed rock masses are encountered in slopes, failure can occur both through the rock mass, as a result of combination of macro and micro jointing, and also through rock substance. Determination of the strength of these rock masses is quite difficult since the size of representative specimens of them is too large for laboratory testing. This difficulty can be overcome by using a non-linear rock mass failure criterion or by back analysis of such slopes. In this paper, a new procedure, and accompanying computer program, is presented for estimation of shear strength parameters, mobilized in slopes cut, in closely jointed rock masses, which obey a non-linear failure criterion, rather than a linear one. In this procedure, the necessary constants to calculate normal stress are dependent to shear strength parameters of the failed rock masses. These parameters can be determined, using a main cross section across the failed slope, without the need for exact value of Geological Strength Index (GSI). In this respect, trials are made with different GSIm and GSIs values, corresponding to various possible combinations of the constant m and s, satisfying the limit equilibrium condition, used in the Hoek & Brown’s failure criterion. The proposed procedure provides a quick check for the GSI obtained from the site investigations. The proposed procedure is used in conjunction with the Morgenstern-Price method of slope analysis, for circular or noncircular slip surfaces. The method outlined in this paper has been satisfactorily applied to Duna landslide, in the right bank of upper dam of Siah Bishe pump-storage, north of Iran.

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APA: Copy

DEHKHODA, S., MEMARIAN, H., & MAHINRAD, A.A.F.. (2007). PROCEDURE FOR BACK ANALYSIS OF SLOPE FAILURES IN CLOSELY JOINTED ROCK MASSES. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 41(3 (105)), 309-317. SID. https://sid.ir/paper/14492/en

Vancouver: Copy

DEHKHODA S., MEMARIAN H., MAHINRAD A.A.F.. PROCEDURE FOR BACK ANALYSIS OF SLOPE FAILURES IN CLOSELY JOINTED ROCK MASSES. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2007;41(3 (105)):309-317. Available from: https://sid.ir/paper/14492/en

IEEE: Copy

S. DEHKHODA, H. MEMARIAN, and A.A.F. MAHINRAD, “PROCEDURE FOR BACK ANALYSIS OF SLOPE FAILURES IN CLOSELY JOINTED ROCK MASSES,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 41, no. 3 (105), pp. 309–317, 2007, [Online]. Available: https://sid.ir/paper/14492/en

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