QUESTION 4 The following figure represents a cross section through a long opening. The magnitudes of the plane c of the field stresses are o, = 13.75 MPa, o, = 19.25 MPa, Ty = 4.76 MPa, expressed relative to the ret shown.

Elements Of Electromagnetics
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QUESTION 4
The following figure represents a cross section through a long opening. The magnitudes of the plane components
of the field stresses are o,= 13.75 MPa, o, = 19.25 MPa, Ty = 4.76 MPa, expressed relative to the reference axes
!!
shown.
1. Calculate the maximum and minimum boundary stresses in the excavation perimeter, defining the locations
of the relevant points.
2. If the strength of the rock mass is defined by a maximum shear strength criterlon, and the shear strength is
20 MPa, estimate the extent of boundary failure, in terms of the angular range over the perimeter.
Transcribed Image Text:QUESTION 4 The following figure represents a cross section through a long opening. The magnitudes of the plane components of the field stresses are o,= 13.75 MPa, o, = 19.25 MPa, Ty = 4.76 MPa, expressed relative to the reference axes !! shown. 1. Calculate the maximum and minimum boundary stresses in the excavation perimeter, defining the locations of the relevant points. 2. If the strength of the rock mass is defined by a maximum shear strength criterlon, and the shear strength is 20 MPa, estimate the extent of boundary failure, in terms of the angular range over the perimeter.
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