CPTU技术在黏性土不排水抗剪强度计算中的应用研究
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摘要
以江苏江海高速公路的黏性土为例,采用孔压静力触探技术(CPTU)对该场地黏性土进行土层测试与不排水抗剪强度的计算研究。结合现场十字板剪切试验,反演该场地黏性土CPTU的三种圆锥系数。最后,以反演的总锥尖圆锥系数(Nk=15.9)来计算该场地其他位置处黏性土的不排水抗剪强度。结果表明:在确定场地圆锥系数的前提下,以CPTU技术来计算黏性土的不排水抗剪强度是可靠的。
Taking the clayey soils of Jianghai expressway in Jiangsu Province as an example,testing of the soil layer in the site and evaluating the undrained shear strength of clayed soil by CPTU were carried out.Based on the field vame shear test,three CPTU cone factors of clayey soils are analyzed.Finally,the undrained shear stength of clayey soils at other locations in the same site is evaluated by the cone factor of total cone tip(Nk=15.9).Under the premise of determining the cone tip of the site,it is reliable to evaluate the undrained shear strength of clayey soils by CPTU technology,which can be used as good reference for evaluating undrained shear strength of other sites.
Taking the clayey soils of Jianghai expressway in Jiangsu Province as an example,testing of the soil layer in the site and evaluating the undrained shear strength of clayed soil by CPTU were carried out.Based on the field vame shear test,three CPTU cone factors of clayey soils are analyzed.Finally,the undrained shear stength of clayey soils at other locations in the same site is evaluated by the cone factor of total cone tip(Nk=15.9).Under the premise of determining the cone tip of the site,it is reliable to evaluate the undrained shear strength of clayey soils by CPTU technology,which can be used as good reference for evaluating undrained shear strength of other sites.
引文
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[17]Lunne T,Christoffersen H P,Tjelta TI.Engineering use of piezocone data in north sea clays[C]∥Proceedings of International Conference on Soil Mechanics and Foundation Engineering.San Francisco:[s.n.],1985:907-912.
[18]Lunne T,Powell JJM,Robertson PK.Cone Penetration Testing in Geotechnical Practice[M].London:CRC Press,1997.
[19]Aas G,Lacasse S,Lunne T,et al.Use of in situ tests for foundation design on clay[C]∥Proceeding of In Situ’86:Use of In Situ Tests in Geotechnical Engineering.Virginia:American Society of Civil Engineers,1986:1-30.
[20]La Rochelle P,Leroueil S,Trak B,et al.Observational Approach to Membrane and Area Corrections in Triaxial Tests[M]∥Donaghe R T,Chaney R C,Silver M L.Advanced Triaxial Testing of Soil and Rock.Orlando:ASTM International,1988.
[21]Rad N S,Lunne T.Direct correlation between piezocone test results and undrained shear strength of clay[J].International Symposium on Penetration Testing,1989,2:911-917.
[2]Kim C,Kim S,Lee J.Estimating clay undrained shear strength using CPTUresults[J].Proceedings of the Institution of Civil Engineers-Geotechnical Engineering,2009,162(2):119-127.
[3]CAI G J,LIU SY,TONG LY,et al.Field evaluation of undrained shear strength from piezocone penetration tests in soft marine clay[J].Marine Georesources and Geotechnology,2010,28(2):143-153.
[4]郭小青,朱斌,刘晋超,等.珠江口海洋软土不排水抗剪强度及循环弱化特性试验研究[J].岩土力学,2016,37(4):1005-1012.GUO X Q,ZHU B,LIU J C,et al.Experimental study of undrained shear strength and cyclic degradation behaviors of marine clay in Pearl River Estuary[J].Rock and Soil Mechanics,2016,37(4):1005-1012.
[5]曹宇春,杨建辉.基于有效固结应力法确定结构性黏性土不排水抗剪强度[J].岩土力学,2013,34(11):3085-3090.CAO Y C,YANG J H.Undrained shear strength determination of structured clays based on effective consolidation stress method[J].Rock and Soil Mechanics,2013,34(11):3085-3090.
[6]胡增辉,李家奇,李晓昭,等.利用标准贯入试验确定粘性土的不排水抗剪强度[J].地下空间与工程学报,2011,7(增刊2):1577-1582,1588.HU Z H,LI J Q,LI X Z,et al.Determination of undrained shear strength of clayey soils by SPT value[J].Chinese Journal of Underground Space and Engineering,2011,7(S2):1577-1582,1588.
[7]王建军,刘鑫,王晨涛,等.孔压静力触探(CPTU)计算软土固结系数及其在港珠澳大桥工程中的应用[J].公路,2013(9):56-62.
[8]Campanella RG,Gillespie DG,Robertson PK.Pore Pressures during Cone Penetration Testing[M].Canada:Department of Civil Engineering,University of British Columbia,1981.
[9]张诚厚.同三国道宁波市境高速公路试验段软基试验研究总报告[R].南京:南京水利科学研究院,1998.
[10]孟高头,张德波,刘春宇,等.用孔压静力触探和室内固结试验求取土的固结系数的对比研究[J].水文地质工程学报,2001(1):18-20.MENG G T,ZHANG D B,LIU C Y,et al.A comparision study conslidation coeffecient of sil by piegocone penetration test(CPTU)and laboratory consolidation test[J].Hydrogeology and Engineering Geology,2001(1):18-20.
[11]孟高头,刘事莲,马淑芝,等.孔压静探试验在珠江三角洲软土地区中的应用研究[J].地质科技情报,2000,19(1):81-84,88.MENG G T,LIU S L,MA S Z,et al.Application research of piezocone penetration test(Cptu)in pearl river delta[J].Geological Science and Technology Information,2000,19(1):81-84,88.
[12]刘松玉,蔡国军,童立元.现代多功能CPTU技术理论与工程应用[M].北京:科学出版社,2013.
[13]CAI G J,LIU SY,TONG LY,et al.Assessment of direct CPT and CPTUmethods for predicting the ultimate bearing capacity of single piles[J].Engineering Geology,2009,104(3/4):211-222.
[14]Lunne T,Kleven A.Role of cpt in north sea foundation engineering[C]∥Norris G M,Holtz R D.Cone Penetration Testing and Experience.New York:ASCE,1981:76-107.
[15]Kjekstad O,Lunne T,Clausen C JF.Comparison between in situ cone resistance and laboratory strength for overconsolidated North Sea clays[J].Marine Geotechnology,1978,3(1):23-36.
[16]Senneset K,Janbu N,Svano G.Strength and deformation parameters from cone penetration tests[C]∥Proceedings of the Second European Symposium on Penetration Testing,ESOPT II.Amsterdam:Balkema Publishing Home,1982:863-870.
[17]Lunne T,Christoffersen H P,Tjelta TI.Engineering use of piezocone data in north sea clays[C]∥Proceedings of International Conference on Soil Mechanics and Foundation Engineering.San Francisco:[s.n.],1985:907-912.
[18]Lunne T,Powell JJM,Robertson PK.Cone Penetration Testing in Geotechnical Practice[M].London:CRC Press,1997.
[19]Aas G,Lacasse S,Lunne T,et al.Use of in situ tests for foundation design on clay[C]∥Proceeding of In Situ’86:Use of In Situ Tests in Geotechnical Engineering.Virginia:American Society of Civil Engineers,1986:1-30.
[20]La Rochelle P,Leroueil S,Trak B,et al.Observational Approach to Membrane and Area Corrections in Triaxial Tests[M]∥Donaghe R T,Chaney R C,Silver M L.Advanced Triaxial Testing of Soil and Rock.Orlando:ASTM International,1988.
[21]Rad N S,Lunne T.Direct correlation between piezocone test results and undrained shear strength of clay[J].International Symposium on Penetration Testing,1989,2:911-917.