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used to analyze the ffect of"void induced" diffuential settlement on a liner system cons <br /> t* <br /> underneath the Proposed vertical of an existing landfill. <br /> ELASTIC SOLUTION MODEL APPLIED TO. A VERTICAL EXPANSION LINE) <br /> SYSTEM DESIGN <br /> ec ni Differrential settlement in a vertical- expansion liner syster <br /> takes place when the, urronnding waste-in the existing landfill moves toward and, in the extrem <br /> case, fills in the vol created'by the degradation of a large object such as a large househol, <br /> aPphanre. A model was developed to analyze this mechanism, as shown on Figure I. In thi <br /> model, soil and waste arc represented by a half space medium. _Surface differential settlement <br /> in the model are influenced by the following factors: <br /> • Engin ee 'ng properties,of the medium; .'. <br /> ® The thic ess of the medium over the void (T)• <br /> • The con irunent liner stem a <br /> ® sy grade (q); and - <br /> The vo size (length 4 x width 4 x depth D). <br /> To quantify the influence of these factors on surface deformation, an influence function <br /> is first developed. 17 a differential settlement can then be calculated and evaluated with the <br /> influence function. <br /> The following s ctions describe the approach, assumptions and procedures used in _ <br /> application of the el-asac solution model, to the design of a liner constructed for the vertica <br /> `i expansion of an existing landfill. <br /> CK <br /> T <br /> D <br /> Lr I <br /> I <br /> Figure I Differential settlement model - three dimensional <br /> Elastic Solution Model <br /> I <br /> Geosynthctics'93-vay-ouver.Chnada-1501 <br />