资源描述：
《Development of a Multiple-Purpose Borehole SOFT ROCK》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、JGeotechnicalTesting,Sept.2002,Vol.25,No.3PaperIDGTJ200210141_253Availableonlineat:www.astm.org1211An-BinHuang,Cheng-KuoFang,Jyh-JongLiao,andYii-WenPanDevelopmentofaMultiple-PurposeBoreholeTestingDeviceforSoftRockABSTRACT:Theauthorsdevelopedaversatileinsitutest
2、ingdevicespecificallyforsoftrock.Themainpurposeofthisdevicewastoprovidede-signparametersforshallowordeepfoundationsinsoftrock.Thenewdevice,referredtoastheBoreholeTestingDevice(BTD)consistedoffourradialcurvedplatensatthetopandacircularsteelplateatthebottom.TheBT
3、Dwasdesignedtobeusedina200-mm-diameterborehole.Drivenbyahighstresspressuremeterandahydraulicpiston,theBTDcanbeusedtoperformaboreholejackingtest,plate-loadingtest,andboreholesheartestinthesameborehole.AmultistagetestingprocedurewasproposedtoperformtheBTDtest.Thi
4、spaperdescribesthedesignandoperationoftheBTDandpresentsasetoftestdatatodemonstratethecapabilitiesoftheBTD.KEYWORDS:softrock,boreholejackingtest,boreholesheartest,plate-loadingtestIntroductionlongitudinalplate-loadingtest(BPLT)atthebottomofthebore-hole.TheIntern
5、ationalSocietyforRockMechanicsclassifiesintactrockhavingauniaxialcompressivestrengthqubetween0.5and25TheDesignoftheBTDMPa(ISRM1981)asextremelyweaktoweakrock.AccordingtoJohnston(1993),softrockmaybeconsideredasagenerictermTheBTDconsistedofthreemajorcompartments,a
6、sdescribedincoveringthosematerialsthatcouldbedescribedashardclays,ex-Fig.1,withatotalheightof1900mm.Itwasdesignedtoperformtremelyweakrock,veryweakrock,andweakrock.Tatsuokaandtestsina200-mm-diameterborehole.ThetopcompartmentcouldKohata(1995)havepresentedtestdata
7、anddemonstratedthatfieldbeexpandedlaterallyagainsttheboreholewallandperformabore-coringcancausesignificantdisturbancetosoftrocksamplesandholejackingtest.Thislateralexpansionjammedthetopcompart-resultinlowstiffnessmeasurements.Forfoundationsinsoftrock,mentagains
8、ttheboreholewall,providedreactionfortheplate-itwouldbemoredesirabletoderivedesignparametersdirectlyloadingtestatthebottomoftheborehole,andexertedanormalfromfieldloadtests.Ho
