- Question 3 7 Marks A A 20 M High Slope Has An Overall Slope Face Sf Figure 2 Of A Road Cutting Dips At 70 With D 1 (80.73 KiB) Viewed 18 times
QUESTION 3 [7 marks] a) A 20 m high slope has an overall slope face (SF) (Figure 2) of a road cutting dips at 70∘ with dip direction 210∘. The slope is in reasonably fresh granite but intersected by three sets of joints labelled J1, J2, and J3 oriented at 270/85 N,055/55SE, and 000/15E, respectively. From laboratory studies, the friction angle φ=20∘. Prepare these three sets of joints on the stereographic projection, and justify the reasons which joint intersection may be responsible for future rock instability. Figure 2 (5 marks) b) During a site investigation, it is important to evaluate the in-situ soils that are present. As such, list two (2) of the soil sampling techniques and samplers that are used to acquire a soil sample (these should be the industry norm)? (2 marks)