ENGIN2503: Rock Mechanics Applications - Engineering Assignment Help

Assignment Task

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. 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.

(RocPlane is a rock mechanics software application. It is available for on campus students in the engineering computing lab in Y building. For students undertaking the course online, please contact Dr Manoj Khandelwal with your student id number, name and Federation University email address so that he can arrange a temporary licence with RocScience to use the program)

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:

1. Plot the Mohr’s stress circle and hence determine the angle of internal friction and cohesion of the rock from Mohr’s envelope

2. If the confining pressure was 600 KN/m2, extrapolate the failure stresses of the rock sample

3. The following table shows data obtained from a single-stage triaxial compression test on a cylindrical rock sample, conducted with closed-loop servo control, at a confining stress of 10.0 MPa, and at zero pore pressure.

Draw the complete stress-strain curve and determine values for the following:

1. Peak strength
2. Residual strength
3. Tangent Young's modulus at 50% peak axial stress
4. Poisson's ratio at 50% peak axial stress

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