基于SCPTU的软土最大剪切模量测试分析研究
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摘要
最大剪切模量是土的基本力学特性参数,对土动力特性分析和岩土工程抗震设计有着重要的意义。目前最大剪切模量的确定主要依赖于室内试验,土样的采取和室内试验既耗时又不能保证精度。以江苏北部里下河古泻湖相软土地区高速公路建设为工程背景,采用地震波孔压静力触探(SCPTU)和下孔法(DHT)进行了土层剪切波速的测试,基于SCPTU和DHT剪切波速测试资料建立了最大剪切模量Gmax与SCPTU测试参数之间的相关关系。结果表明:采用SCPTU测试的锥尖阻力和孔压参数能够用于对软土的最大剪切模量的初步评价。
The maximum shear modulus is a fundamental parameter related to the mechanical behavior used for analysis of dynamic behavior and aseismatic design of geotechnical structures of soft clays.The previous methods to get the maximum shear modulus in China are generally from the laboratory test which is of time consuming and lower accuracy.This paper performed the measurements of shear wave velocity using the downhole and seismic piezocone tests on the background of expressway engineering of the Quaternary Lixiahe ages-old lagoon facies soft soils in North Jiangsu.Based on the shear wave velocity test data from the downhole and seismic piezocone tests,empirical correlations between the maximum shear modulus Gmax and parameters derived from piezocone measurements are developed.It is shown that the piezocone tip resistance and pore pressure parameter can be used for a preliminary estimate of the maximum shear modulus Gmax of soft soils.
The maximum shear modulus is a fundamental parameter related to the mechanical behavior used for analysis of dynamic behavior and aseismatic design of geotechnical structures of soft clays.The previous methods to get the maximum shear modulus in China are generally from the laboratory test which is of time consuming and lower accuracy.This paper performed the measurements of shear wave velocity using the downhole and seismic piezocone tests on the background of expressway engineering of the Quaternary Lixiahe ages-old lagoon facies soft soils in North Jiangsu.Based on the shear wave velocity test data from the downhole and seismic piezocone tests,empirical correlations between the maximum shear modulus Gmax and parameters derived from piezocone measurements are developed.It is shown that the piezocone tip resistance and pore pressure parameter can be used for a preliminary estimate of the maximum shear modulus Gmax of soft soils.
引文
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[9]SHIBUYA S,TANAKA H.Estimate of elastic shear modulus in Holocene soil deposits[J].Soils and Foundations,1996,36(4):45-55.
[10]SIMONINI P,COLA S.Use of piezocone to predict maximum stiffness of Venetian soils[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2000,126(4):378-382.
[11]SKEMPTON A W.The pore pressure coefficients A and B[J].Geotechnique,1954,4(4):143-147.
[12]SENNESET K,JANBU N,SVANO G.Strength and deformation parameters from cone penetration tests[C]//Proceedings of the 2nd Europe Symposium on Penetration Testing.Rotterdam:Balkema,1982,(2):863-870.
[2]刘松玉,吴燕开.论我国静力触探技术(CPT)现状与发展[J].岩土工程学报,2004,26(4):553-556.LIU Song-yu,WU Yan-kai.On the strategy and development of CPT in China[J].Chinese Journal of Geotechnical Engineering,2004,26(4):553-556.
[3]BALDI G,BELLOTTI R,Ghionna V N,et al.Modulus of sands from CPT and DMT[C]//Proceedings of the 12th International Conference on Soil Mechanics and Foundation Engineering.Rotterdam:Balkema,1989,(1):165-170.
[4]TANAKA H,TANAKA M,IGUCHI H,et al.Shear modulus of soft clay measured by various kinds of tests[C]//Proceedings of the International Symposium on Pre-Failure Deformation of Geomaterials,Rotterdam:Balkema,1994,(1):235-240.
[5]MAYNE P W,RIX G J.Gmax-qc relationships for clays[J].Journal of Geotechnical Testing,1993,16(1):54-60.
[6]HEGAZY Y A,MAYNE P W.Statistical correlation between Vs and cone penetration data for different soil types[C]//Proceedings of the International symposium on Penetration Testing.Sweden:Swedish Geotechnical Society,Linkoping,1995.
[7]TATSUOKA F,SHIBUYA S.Deformation characteristics of soils and rocks from field and laboratory tests[R].Tokyo:Report of the Institute of Industrial Science,University of Tokyo,1992,37(1):136-142.
[8]JAMIOLKOWSKI M,LANCELLOTTA R,Lo Presti D C F.Remarks on the stiffness at small strains of six Italian clays[C]//Proceedings of the 1st International Conference on Prefailure Behaviour of Geomaterials.Rotterdam:Balkema,1994,(2):817-836.
[9]SHIBUYA S,TANAKA H.Estimate of elastic shear modulus in Holocene soil deposits[J].Soils and Foundations,1996,36(4):45-55.
[10]SIMONINI P,COLA S.Use of piezocone to predict maximum stiffness of Venetian soils[J].Journal of Geotechnical and Geoenvironmental Engineering,ASCE,2000,126(4):378-382.
[11]SKEMPTON A W.The pore pressure coefficients A and B[J].Geotechnique,1954,4(4):143-147.
[12]SENNESET K,JANBU N,SVANO G.Strength and deformation parameters from cone penetration tests[C]//Proceedings of the 2nd Europe Symposium on Penetration Testing.Rotterdam:Balkema,1982,(2):863-870.
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