土工格栅加筋垫层的效果检验

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1、第24卷第3期岩石力学与工程学报Vol.24No.32005年2月ChineseJournalofRockMechanicsandEngineeringFeb.，2005土工格栅加筋垫层的效果检验马时冬(华侨大学土木工程系，福建泉州362011)摘要：泉州市两个古建筑城门楼工程(朝天门和临漳门)对沉降敏感，原设计采用桩基础加钢筋混凝土板的地基加固方案，因其造价昂贵，施工困难，而改为土工格栅加筋垫层的方案。由于当地首次采用加筋垫层，为了检验其效果，进行了多达21组载荷试验，并进行了沉降观测。结果表明，土工格栅加筋垫层可使地基承载力成倍提高，

2、同时能有效地均衡差异沉降和减少总沉降量。建筑物的实际沉降非常小，朝天门城门楼的最大沉降量不超过1cm，临漳门则几乎测不出沉降量，完全能满足工程要求，由此节省了300多万元资金，并使施工大为简化。关键词：土力学；土工格栅加筋垫层；地基承载力；载荷试验；沉降观测中图分类号：TU431文献标识码：A文章编号：1000–6915(2005)03–0490–06VERIFICATIONOFREINFORCEDEFFECTONGEOGRIDCUSHIONFORFOUNDATIONSTRENGTHENINGMAShi-dong(Departmentof

3、CivilEngineering，HuaqiaoUniversity，Quanzhou362011，China)Abstract：InQuanzhoucity，therearetwoancientcity-gatebuildingswhichneedtobereconstructed，i.e.，theChaotianmenandLinzhangmencitygatebuildings.Thefoundationsofthetwostructuresareverysensitivetosettlementandhavetobestrengt

4、hened.Theoriginaldesignschemewaspilefoundationplusconcreteslabwithsteelbarreinforcement.Sinceitisexpansiveandhardtoconstruct，analternativemethodistakenintoaccount.Thegeogridreinforcementcushionisusedunderneaththefooting.However，duetolackofexperienceoflocalsoil，21fieldload

5、ingtestswerecarriedouttoverifytheeffectofgeogridcushion.Theresultsshowthatthebearingcapacityofthefoundationreinforcedwithgeogridcushionisincreasedalmosttwiceasthenaturalfoundation.Meanwhile，thedeformationbehaviorofthereinforcedfoundationisalsoimproved.Thedifferentialsettl

6、ementisharmoniousandthetotalsettlementcanalsobereduced.Thein-situmonitoringshowsthatthemaximumsettlementforChaotianmencitygatebuildingislessthan1.0cm，whileforLinzhangmencitygatebuildingalmostnosettlementisobserved.Itmeansthatthenewdesigncancompletelymeettherequirementofth

7、osestructures.Moreover，thecostofreconstructionworkwasreducedmorethan3millionRMBandtheconstructionwasalsosimplified.Keywords：soilmechanics；geogridreinforcementcushion；bearingcapacityoffoundation；loadingtest；settlementmonitoring计划参照史料建造几座体现唐宋时期建筑风格的城1引言门楼，朝天门和临漳门是其中的两座。该古建筑

8、上部为木结构，下部为石结构，对沉降比较敏感。最泉州市是历史文化名城，为了恢复古城风貌，初的设计采用桩基础加钢筋混凝土板，不仅造价昂收稿日期：2003–09–09；修回日期：2003–10–24