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• Sec. 2.9 Deslgning for Separation 71 <br />This value of T,~ can be compared to the puncture test (if the object is blunt, causing <br />puncture) or to the tear test (if the object is sharp, causing tear). Both types of tests were <br />described in Section 2.I.3. <br />Using some assumptions (which can be modified as described) a design guide can <br />be developed as shown in Figure 2.17. It was developed on the basis that the geotextile <br />had an initial opening size of 0.06 mm (= 0.00236 in.) and the protruding stones had a <br />sphericity of 0.4. Thus <br />T,w, _ (0.00236rrd,)p'(I - 0.4) <br />= 0.00445d,p' <br />Example: What is the required puncture resistance o(a woven gcoteztile of AOS = No. 30 <br />a <br />0 <br />• a <br />c <br />y0 <br />i <br />a <br />4 <br />C <br />C <br />L <br />J <br />a <br />a <br />'v <br />¢` <br />Pressure on goetextile Ilb/~ntl <br />1'-' 0.75 rare intlarion Pressure) <br />Figure 2.17 Typical puncture rcsistancc deign guide. <br />• <br />50 75 100 1Z5 t50 <br />