Question: The sketch below ( Figure 1 ) illustrates the case of a parallel sided block in the roof of a tunnel acted upon by an

The sketch below (Figure 1) illustrates the case of a parallel sided block in the roof of a
tunnel acted upon by an average horizontal, normal stress of 0.1MPa. The mass density of
the rock is 2700kgm3. Take a unit thickness of 1m in the third dimension.
If the shear resistance of the two vertical planes of weakness is characterised by an angle of
internal friction 20 and cohesion of 10kPa, will the block become unstable if no rock bolts
are used.
The sketch below ( Figure 1 ) illustrates the

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