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. Calculations <br />FIGURE 1: <br />QUARRY SLOPE STgglL1TY <br />R1O GRANDE RED ROCK SITE <br />/ ~ <br />~ u, w <br />LL LL LL <br />° Q ° <br />AreaArea 77~~ Sltt)/ <br />= 7?36 sf/f <br />overburden <br />HAVES MEMBER <br /> <br />Assumptions <br />'- <br />• Sliding Block Ana <br />•Dry slope IYSes (Daylighting Bedrock) 5000 <br />• Wwst <br />Case Slope. Vertical High Wall Shear 6trengin or Shale Interbetls <br />~1f°n shear ResWls <br />•Slidin <br />9 controlled b <br />' m on Remomen Spetlmens ~ (Reference 7) <br />y fdcb <br />on angle along <br />basal failure plane tlip sbpe in shale <br />• No lateral <br />t y <br />FMi <br />s <br />rength tlue to interconnecting joints <br />Shear strength of overbuNen ~ <br />M <br />y ~ <br /> <br />°S8G weak r`mOw" <br />zo <br />°' <br />u ignored <br />• Total Herght = q6 (eel ~ <br />r' ~ ~ a-zas <br />, <br />'G uNmate rid <br />° i <br />•Overburden Thickness=Sleet s <br />xak remopm O1~~e-xor <br />~'15.0'd55 <br />16° a~ameb ramea <br /> <br />• Unil Wt. of timastone = 745 <br />' • <br />0 eC <br />ca, 15 Y-t5S <br />pcf <br />Unit Wt. of Soi! = 170 ppf <br /> 0 <br />• Design Strength or Basal F normal stress <br />• Friction angle (PH7 allure Plane (PSf} <br />e A edy ekUnp TYSickn Ses deg actual dip approx. 2 to 3 degrees, 5 degrees assumed fo be conservative) <br />• WL Of Block=(1736 sfx t45 pcf)+(715 sfx 110 pq)=177370 fb <br />• Driving Fwce= W (SIN(5)) = 15,4631b. <br />• Resisting = W(CpS (5))TAN(PHI) = 87,35816. <br />° Factor of safety against Sliding = 3.7 <br />'YPPBxhibitsq.7'_gpp(I I80)RavB/laaaary 17, 2002 <br />2 <br />70000 <br />