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36“这种材料可对某些土层进行分隔和过滤”TencateMirafi的发言人DickJanse说，“如果你想减少沙、石等建筑材料的用量，降低成本，可以在下面加一层强度更大的土工合成层。”在铺设公路和机场跑道时，可先在软路基上铺一层Mirafi公司生产的土工合成材料，然后再铺碎石路基。这样可以防止碎石路基中的沙砾、碎石陷入软路基中，保持路面的结构完整性。采用土工合成材料可延长路面的免养护期。在修筑铁路时，可在现有的路基和碎石道床之间垫一层土工合成材料，防止路基的土层渗入碎石道床，从而保持结构的完整性。采用土工合成材料可大大延长铁路的养护间隔，材料和人工成本的节省亦相当可观。Janse说：“土工合成材料的用途很广泛。而在80％的情况下，使用土工合成材料比传统材料更经济实惠。”小图：高性能聚丙烯土工织物可同时用于分隔、加固和过滤大图采用土工合成材料可大大延长铁路的养护问隔期Inset：High—performancep0IypropeIenegeotextilesareusedforseparation，reinforcementandfiltrationMainphoto：Theuseofageosynfheficsignificantlyincreasestheperiodsbetweentrackmain}enanceeosynthetiesistheumbrellatermthatdescribesarangeofsyntheticproductsusedtosolvegeotechnicaIproblems.ThesyntheticnatureoftheproductsmakesthemSBitableforUSeinthearoundWherehiqhIevelsofdUrabiIityarereqUired.RoadandtrackSUrfacescertainlvmatchthiSspecificationandonecompanvthathasrecoqnisedthiSiSUS—basedTencateMiraft.GeOsvntheticswerefirstusedafterabiqfloodinHollandin1953.Someofthedikesleakedandtheholesweref…edwithsandbaqs.whichatthiStimeweremadeofiuteEveryfiveyearsthesebagsbeqantorotawaVThensomeonethouqhtwhynotmakethesandbaqsfrOmSOmesynthetic?ThiSsomeonewasNiCOTerkuelewhoqottheideatousebaqsmadeofpolyamidesIikenylonwhichdOn。trotaway.Later.thiSuseofgeosyntheticmateria『wasspunofffrommarineanddikeprotectiontootheraPPIicationssuchasroadandtrackbuildina.AtTencateMirafi.high—performancepolypropylenegeotextiIesareusedforseparation.reinforcementandfiltration.SOthereinforcementfunctionsofaqeoqridandtheqeotextilearetombinedinonehiah—strenqthmateriaI.“TheyseparateorflltercertainIayersofSOiI.”saysDickJansespokespersonforgeosynthetiespeciaIistsTencateMirafj.“lfRoad＆RailTechnology·