混杂纤维混凝土的耐火性能研究及其在隧道工程中的应用

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1、西南交通大学硕士学位论文混杂纤维混凝土的耐火性能研究及其在隧道工程中的应用姓名：贺丽娟申请学位级别：硕士专业：桥梁与隧道工程指导教师：李志业20070401西南交通大学硕士学位论文小，同时也减小了发生破坏的深度范围。当聚丙烯纤维掺量为2．Okg／ma～2．5kg／ma的时候，混凝土在高温下的爆裂现象有了明显的改善。6．综合试验与数值模拟计算的结果得到适用于实际隧道工程的混杂纤维混凝土的较优掺量为钢纤维掺量为35kg／m3和聚丙烯纤维掺量为2．0kg／m3～2．5kg／ma。关键词：混杂纤维混凝土；耐高温性能；火损试验；隧道衬砌西南交通大学硕士学位论

2、文AbstractHybridfiberfoncreteisanewfieIdoffiberfoncrete．Itcanbuildupthestrengthofconcreteandamelioratethepropertyofconcretethroughadoptingcomplexoverlappedmode．Cometolight，nomatterwhathighpropertyconcrete，justthesanlenormalstandardconerete，theyhavethesameshortcoming，namelynofir

3、e-resistance．ButthehybridfiberconcreteCanamelioratethefire：resistanceofhi班propertyconcretethroughimmingtingthelowmeltpointfiberandthehighmeltpointfiber．Soithasveryimportantpracticalsignificancetostudythefire-resistunceofhybridfiberconcrete．Combiningtheguidelineoffireprotection

4、designintunnelstructure，thispaperadoptshybridfiberconcreteintunnelstructuretoameliomtethefire-resistantcapabilityofconcrete．Allowforeconomyandproperties，thispaperselectssteelfiberandpropylenefibertojumbleatsmalladdition(byvolume)，andcan'ythroughfollowingstudies：I．Thefiretestin

5、g，surveyingtheinnertemperatureofdifferentadditionspecimens．2．Mechanicspropertiesexperimentsofthespecimensbeforethefiretestingandafterfiretestingincludecubicstrengthofconcrete，splittensilestrengthofconcreteandlossofweight．3．SimulatingfireoftunnelengineeringwimANSYSanalysissoR．t

6、hetunnelliningadoptsreinforcedconcreteandfivekindsofhybridfiberconcrete，analyzinginnertemperaturefielddistributionandtemperaturestressdistribution．Throughcombiningtestsandcomputersimulate．thispapergainedthefollowingconclusion：I．Theinnertemperatureconducfionofconcretehasvisible

7、meliorationwiththeincreaseofpropylenefib既Theinnercalefaetivespeedandlapserateareleastwhenthepropylenefiberadditionisabout2．0kg／m'．2．Thehybridfibercallenhancethecubicstrengthandsplittensilestrengthofconcreteafterfire—testing,itCanminishthelossofweightwhentheconcretehappenedblow

8、out．Thehybridfiberconcretehasaforesaidadvantagewhichisconstit