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~.o a,~an amts[ Erna <br />As IDentloned prwiatsly, the peroentege o! fine opal wash used in oonetruction <br />of the refuse pile, ea well as the oorntx,iction ~raoedut~s have been a~arx3ed fma <br />tttioro in use at the rise of the original design. Of interest are the potential <br />ette~ts of these duit]es and of the absatved density levels on the shear strength <br />atta tharafotn, the stability o! the refuse pile. <br />M Cottistti~ction p~ooedures in aarent use favor the development of altaztvstirg <br />layers of coarse and fine raRtse. Zlte potential for failure planes to seek out <br />and tt:'ar~c taeaker layers within the pile (l.e., the fire layers) has been <br />irtcreaeed. 1lterefora, tea have oonsezvatively ale-fed to evaluate shear strerriths <br />of the Lino zvilsa only. Since the ittsitu density fmn the refuse materials was <br />feud to be highly variable, we elecGad to obtain shear sttenyth data at several <br />different densities beginning with an initial density at or near the mean deity <br />fcar the line reluse, abtaini.ng another test approximately one standard deviatiaz <br />bald this density and yet a thin test at least tw standard deviations below <br />this d'ertsity. Lttormation on the specifies of the direct shear testing lrtludiag <br />strain rata, normal loads, stress strain plots and strength envelopes will be <br />found in }~ppevdix A. A summary of the actual initial dry densities utilized aM <br />the corz+espotdirq friction angles observed will be found in Tabu S. Figure 6 <br />shoes a Blot of friction angle vetsus initial dty density. The friction angles <br />z~epotfed repa:~aertt ooraolidnted drained ar effective stress friction angles. Zr-e <br />Initial design was based on an effective stress friction angle of ]5•, Using the <br />plat on !'igurv 6, a lrictian angle of 35' world requite an ih situ density o! at <br />least 5Z.] pcl. Ass~anirq the density to be a normal variata and using the meant <br />dry denity for the fine rosuse o! 61.9 pef atxt the stardazd deviation o! 6.9 <br />pd, wee have ostitn3tad the prsbability that the in place density will eQunl or <br />a~asd SZ.J pc! to be appxtodmatelY 91.l;. <br />