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This Page Is Protected By Copyright Of Lakehead University Reproduction Or Dissemination Of This Document Manumannas Wh 1 (61.98 KiB) Viewed 33 times

This page is protected by copyright of Lakehead University. Reproduction or dissemination of this document manumannas whatsoever fee sharing the content with anyone else) is strictly prohibited. Problem 4 (8 marks) The figure below represents a cross section through a long underground circular opening with an inclined, radially oriented plane of weakness intersecting the circular excavation whose trace on the excavation boundary is located at an angle = 45° above the horizontal diameter. It is assumed that the weakness has zero tensile strength, and is non-dilatant in shear, with a shear strength defined by t = on tan o, where is the angle of friction of the weakness. The far-field stresses are defined by components p (vertical) and 0.5p (horizontal). Answer the following questions: (1)Ifø = 18°, will the rock mass at " = 2.5 slip along the plane of weakness? (2) If ¢ = 13°, will the rock mass at = 2.5 slip along the plane of weakness? Give your reasons. FINA Part(1) TU !!! P 5 1423 (1+2-3 tand = 1 Ixo.5 al P/x1.5 (1+ Y