Question

QUESTION 1 A series of quartzite beds dip into an open pit mine. How steep can the beds dip if they have an irregularity value of i 120, assuming a dry slope, no cohesion and a required factor safety of 1.2? (40 marks) Rock name or Varieties Quartzite and quartzite rich rock Schist and related rocks Approximate value 300 20-250 30-350 8-200 Carbonates Clays and clay shales Table of angle of sliding resistance according to rock type and smooth contacts

Answer 1

slope for dny a C A wej 9 tan( + i) to aapy safety W sino If c.CD. cohtsion no / W ces tan ( 0+i fos W sino FOS tan tan 9 = 12 Given' Fos 30 tan 3012 O.7S03 tone -