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FIGURE 4 <br />• ELASTIC SOLUTION DIFFERENTIAL SETTLEMENT MODEL (3) <br />Ll <br />Three cimensionai elastic solution model of sloping surface over a void. <br />Z0 <br />1.8 O <br />c /® 1.6 <br />ca 12 [.J o <br />3 1.0 <br />E ® 0.8 <br />E — .0.6 O <br />c � I <br />OZ a I <br />0.0..� <br />0.0 0.2 0.4 0.6 0.8 1.0 1.2 <br />Ratio of Void Width to Controlled iil Thickness (L./T) <br />Maximum tensile strain verses ratio of void width/fill thickness over 0.9m x <br />0.9m x 1.8m (3'x3'x6') void. <br />5.0 <br />O.O-O <br />O <br />.5 $ SLJP_ 0 <br />0.0 0 5 10 15 20 25 30 35 40 <br />Containment Liner Grade (degree) <br />Required fill thickness (T) to prevent grade reversal verses liner grade over <br />3'x'3'x6' void. <br />