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1、广西红粘土和膨胀土热力学特性的比较研究第26卷第7期2005年7月岩土力学RockandSoilMechanicsVo1.26No.7Ju1.2005文章一号IlO00—7598一(2005)07—1068-05广西红粘土和膨胀土热力学特性的比较研究欧孝夺,吴恒,周东(广西大学土木建筑工程学院,南宁530004)摘要.基于广西膨胀土和红粘土的成因类型,物质成分和结构特征,研究常温(_4℃～6o℃)下膨胀土与红粘土的热力学特性,探讨了红粘土与膨胀土的抗剪强度指标与温度之问的相关关系.试验结果表明,两种土在l0℃,40℃与室温(28℃)时,主应力差一峰值变化不大,而
2、60℃时有明显增大;在相同条件下,红粘土的主应力差峰值变化更大;红粘土与膨胀土的抗剪强度指标(c,)随热状况不同而发生变化,而且红粘土的粘聚力C和膨胀土的内摩擦角妒在室温,环境有较小值.分析结果认为,两种土的热效应影响趋势相似,但红粘土的热力学特性较为敏感,这与红粘土的成因类型及胶结特征密切相关.研究结果为红粘土与膨胀土地区工程建设及减灾防灾提供参考.关键词:红粘土;膨胀土;热力学中图分类号.Tu441文献标识码:AComparativestudyonthermodynamicscharacteristicsofredclayandexpansivesoilsi
3、nGuangxiOUXiao—duo,WUHeng,ZHOU—Dong(CollegeofCivilandArchitecturalEngineering,GuangxiUniversity,Nanning530004,China)Abstract:Basedonanalyzingthecausesofinformation,materialcomponentsandstructuralcharactersofthecommonexpansivesoilandtheredclayedsoilinGuangxi,somethermodynamicstestshav
4、ebeendoneontheredclayedsoilandtheexpansivesoilundernormaltemperature(-4℃一60℃1tosearchtheirthermodynamicscharactersandtheirrelationsbetweenshearstrengthindexandtemperature.Accordingtothetests,(al-0"3)peakvalueofthetwokindsofsoilsdonotchangemuchundertheindoortemperature(28℃)andthetempe
5、ratureof10℃,40oCenvironmentrespectively,whileunderthetemperatureof60℃thechangeisobviousUnderthesameconditionsthemaindifferencestresspeal(valueoftheredclayedsoilhasagreaterchange.Theshears~engthindicesCoftwosoilschangewiththehotstateaccordingly.Furthermore,thecohesivestressCoftheredcl
6、ayedsoilandthefrictionangleofthecommonexpansivesoilarelessrelativelyintheindoortemperatureenvironment.FromthetestswecanconcludethatthetendencyofthethermodynamicinfluenceontheredclayedsoilandtheexpansivesoiliSsimilar,but山eredclayedsoiliSmoresensitivetothethermodynamicchange.Allthesedi
7、fferencesarecausedbythegenetictypeandagglutinatecharacterofthecommonclayedsoil.TheresultofstudyoffersreferenceforreducingthedisastersandtakingprecautionsagainstthecalamitiesSOastohelptheconstructionontheredclayedsoilandexpansivesoilarea.Keywords:redclay;expansivesoil;thermodynamics1引
8、言广西地处低纬地带,属亚
