Question: There are two structural weakness planes emanating from the corners of the opening with a flat roof. The inclinations of the discontinuities are 6 0

There are two structural weakness planes emanating from the corners of the
opening with a flat roof. The inclinations of the discontinuities are 60\deg and 120\deg
respectively. The unit weight of the rock is 20kN/m3, and the span of the opening is
10m. Determine the total support force per metre length of opening required to
prevent failure of the roof wedge.

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