ENGIN2503:Rock Mechanics Applications Project and Lab Work - Engineering Assignment Help

Assignment Task:

Task:

Q. 1
A discontinuity is found fully developed from the toe to the bench surface on a 15 m high slope, slope angle 65°. The discontinuity (frictional angle 32° and cohesion 20 kN/m2) is planar and its strike is parallel to the slope face with a dip 45°. Determine the factor of safety in case of a planar slope failure. Unit weight of the rock is 27 kN/m3. You are required to use RocPlane software to evaluate the stability of the slope (20 marks). If the factor of safety is less than 1.3, then you need to design slope reinforcement system to raise the factor safety to 1.3 (10 marks).

Q. 2
A series of shear tests were performed on a weak rock. Each test was carried out until the sample sheared, and the principal stresses for each test were:

S. No. σ3 (KN/m2) σ1 (KN/m2)1 200 570
2          300                              875
3          400                            1162

Plot the Mohr’s stress circle and hence determine the angle of internal friction and of the rock from Mohr’s envelope (20 marks). If the confining pressure was 600 KN/m2, extrapolate the failure stresses of the rock sample (20 marks).

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