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ased to yu theffect of"void induced" differential SeWement on a liner system <br /> underneath the proposed vertical of an existing landfill. Y cons <br /> EI.AMC SOLUTION MODEL APPLIED TO-A VERTICAL EXPANSION LINE) <br /> SYSTEM DESIGN <br /> e- n j e eme Mech ni Differential settlement in a vertical expansion liner syster <br /> takes place when the-surrounding waste-in the existing Iandfill moves toward and, in the extrem <br /> case, fills in the void created'by the degradation of a large object such as a large househ.01, <br /> appliance. A model as develo anal. <br /> ped to yze this mechanism, as shown on Figure I. In thi <br /> model, soil and was are represented by a half space medium. .Surface differential settlement <br /> in the model arae influenced by the following factors: <br /> • <br /> Engineering properties-of the medium; .. <br /> • The thic[mess-of the medium over the void (T), <br /> • The con 'nment-liner sten <br /> ® sy grade (a); and <br /> The voi' size (length L, x width 4 x depth D). <br /> P <br /> 1 To quantify the influence of these factors on surface deformation, an influence functioi <br /> ' is first developed, a di-fferential settlement can then be calculated and evaluated with the <br /> influence function. <br /> 1 The following sections describe the approach, assumptions and procedures used in.t� <br /> application of the elan c solution model, to the design of a liner constructed for the vertica <br /> expansiGn of an existing landfill. <br /> Q <br /> T <br /> L7 L, <br /> Figu e 1 DifferentW settlement model - three dimensional <br /> Elastic Solution Model <br /> Geosynthetics"93-Vancouver.Canada- 1501 <br />