Answer Happy

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