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used-to analyze the €feet of"void-induccd" differential settlement on a liner system const*e <br /> -- underneath the pro sed vertical of an existing landfin. <br /> E -- C SOLUT ON MODEL APPLIED TO- A VERTICAL EXPANSION LINEI <br /> SYSTEM DESIGN <br /> e ' - -ec Differential settlement in a vertical expansion liner syster <br /> takes place when the urrOunding waste-in the existing landfill moves toward and, in the extnem <br /> ease, fills in the void created'by the degradation of a largo object such as a large househol. <br /> appliance. A model was devapped to analyze this me SMsm, as shown on Figure I. In thi <br /> modal, soil and waste are represented by a half space medium. .Surface differential settlement <br /> in the model are influenced by the following factors: <br /> • Engine jag properties.of the medium; ,. <br /> • The this . ess-of the medium over the 'void <br /> • The con 'nment liner system grade (ac); and <br /> • The voic size (length L, x width 4 x depth D). - <br /> 1 To quantify the influence of these factors on surface deformation, an influence function <br /> ' is first developed. 71ed1ifferential settlement can then be calculated and evaluated with the <br /> influence function. <br /> The following ctions describe the approach, assumptions and procedures used in <br /> application of the elastic solution model, to the design of a liner constructed for the vertica <br /> =1 expa-ftsian of an existin landfifl. <br /> a <br /> T <br /> D <br /> Figu e 1 Differential settlement model - three dimensional <br /> Elastic Solution Model <br /> Geosynthetics'93-Vancouver.Canada-1501 <br />