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used to analyze the effect of"void induced" differential settlement on a liner system constructe <br /> underneath the proposed vertical of an existing landfin. <br /> ELASTIC SOLUTION MODEL APPLIED TO. A VERTICAL EXPANSION LINE) <br /> SYSTEM DESIGN <br /> Differential Settlement Mechanism Differential settlement in a vertical expansion liner syster <br /> takes place when the surrounding waste in the existing landfill moves toward and, in the extrem <br /> case, fills in the void create*by the degradation of a large object such as a large househ.ol, <br /> appliance. A model was dev-eioped to analyze this mechanism, as shown on Figure I. In thi <br /> model, soil and waste arse represented by a half space medium. .Surface differential settlement <br /> in the model are influenced by the following factors: <br /> • Engineering properties_of the medium; .. <br /> • The thickness-of the medium over the void ('1); <br /> • The containment liner system grade (a); and <br /> • The void size (length 4 x width 4 x depth D). - <br /> To quantify the influence of these factors on surface deformation, an influence functioi <br /> is first developed. The d=ifferential settlement can then be calculated and evaluated with the <br /> influence function. <br /> The following sections describe the approach, -assumptions and procedures used in the <br /> application of the elastic solution model, to the design of a liner constructed for the vertica <br /> rl - expansion of an existing landfill. <br /> CIL <br /> T <br /> D <br /> t f <br /> Figure I Differential settlement model - three dimensional <br /> Elastic Solution Model <br /> Goosynthetics'93-Vancouver,CSana&- 1501 <br />