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时间:2020-03-26
《鲁西南某2×300MW坑口电厂桩基原位试验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、JournalofEngineeringGeology工程地质学报1004—9665/2012/20(6).1057.07鲁西南某2x300MW坑口电厂桩基原位试验研究术周亮①②倪恒②范延彬②(①长安大学地质工程与测绘学院西安710054)(②国核电力规划设计研究院北京100095)摘要鲁西南某2~300MW坑口电厂地基位于黄河冲积地层中,工程地质性质较差,地基强度不能满足电厂重要建(构)筑物的要求。根据现场的工程地质条件,施工中采用预应力高强混凝土管桩(PHC桩)进行地基处理。本文以鲁西南某2×300MW坑口电厂桩基检测工程为实
2、例,首先采用低应变法对桩身质量进行了检测,然后采用高应变试验和静载试验2种方法确定了单桩竖向极限承载力,并对这2种方法的优点、缺点和影响因素进行了分析和对比。得出结论:(1)采用高应变CAP—WAP法拟合后的试验结果与单桩竖向静载荷试验结果基本吻合,通过选取合适的桩、土参数模型使高应变试验的结果准确可靠,是切实可行的。(2)在现场条件不允许开展静载试验时,高应变试验可作为静载试验的补充手段对桩基进行检测。(3)当能够获得可靠的高应变试验结果(与静载试验基本吻合)时,可以通过严谨计算对规范法设计方案进行一定程度的调整,以节约成本,但
3、要慎重对待。关键词桩基PHC桩低应变试验高应变试验静载试验中图分类号:TU473.16文献标识码:AIN—SITUTESTSoFPILEFOUNDATIoNATPoWERPLANTINSoUTH.WESToFSHANDoNGPRoVINCEZHOULiang①②NIHeng②FANYanbin②(@SchoolofGeologyEngineeringandGeomatics,ChanganUniversity,Xian710054)((~)StateNuclearElectricPowerPlanningDesign&Resear
4、chInstitute,Being100095)Abstractthefoundationofa2x300MWpithead’SpowerplantinsouthwestofShandongprovinceislocatedinal—luviallayersoftheYellowRiver.Theengineeringpropertiesofthestrataarepoor.Thelowfoundationstrengthcan’tmeettheneedsofthekeystructuresandbuildingsofthepow
5、erplant.Accordingtothegeologicalconditions,foundationtreatmenthasbeenconductedbyhigh—strengthpre-stressedconcretepipe.Inthecasestudy,wetestthepilebodywithlowstrainintegritytestingmethods,determinetheverticalultimatebeatingcapacityofsinglepileu-singtwomethodssuchashigh
6、straintestsandstaticloadtests,andcontrasttheadvantages/disadvantagesandaf-fectingfactors.Thenweconcludethefollowingthreeresults.(1)TestingresultsbyhighstrainCAPWAPmethodaf-terfittingagreewellwiththatbytheverticalstaticloadofasinglepile.Soitislikelytoenhancetheaccuracy
7、andreliabilityofhighstraintestresultsbyoptimizingthepileandsoilparameters.(2)Whenitisnotallowedforin—situstaticloadtest.highstraintestscanbeusedasasupplementmeanstotheloadtestforpilefoundation.(3)Whenwegetmorereliablehighstraintestresults.someadjustmentscanbemadef0rth
8、edesignschemeaccordingtostandardmethodbasedonrigorouscalculation.KeywordsPilefoundation,PHCpile,Lowstrainintegritytesting,Hi
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