深层海床粉质黏土动剪切模量和阻尼比试验研究
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摘要
利用英国GDS公司研制的空心圆柱扭剪仪,采用应变控制,对琼州海峡海床埋深超过100m的粉质黏土进行动三轴试验,研究有效围压、塑性指数对其动剪切模量Gd和阻尼比的影响。研究发现:在相同条件下塑性指数越大动剪切模量越小,而阻尼比变化规律不明显;根据塑性指数IP、孔隙比e和有效围压σ0'建立了适合计算深层海床粉质黏土最大动剪切模量的经验公式,拟合出模量衰减曲线Gd/Gdmax-γd和阻尼比增长曲线λ-γd的经验公式并给出其上、下包络线拟合参数值。
Cyclic triaxial tests controlled by the strain are performed on undisturbed marine silty clay which is located more than 100m depth of The Qiongzhou Strait seabed by the hollow cylinder apparatus made by GDS.Meanwhile,the effects of effective confining pressure and the plastic index IP on the dynamic shear modulus Gd and the damping ratio λ were investigated.It is found that under the same conditions the greater the plastic index is,the smaller dynamic shear modulus are,but the change of damping ratio has no obvious rule.According to the plastic index IP,porosity e and effective confining pressure,an experience formula,which is suitable for calculating the maximum dynamic shear modulus of the deep seabed silty clay,is established.Based on the test results,the fitting parameters of envelope curves of dynamic shear modulus ratio Gd/Gdmaxand damping ratio λ versus dynamic strain γd for deep-sea marine silty clay are presented.
Cyclic triaxial tests controlled by the strain are performed on undisturbed marine silty clay which is located more than 100m depth of The Qiongzhou Strait seabed by the hollow cylinder apparatus made by GDS.Meanwhile,the effects of effective confining pressure and the plastic index IP on the dynamic shear modulus Gd and the damping ratio λ were investigated.It is found that under the same conditions the greater the plastic index is,the smaller dynamic shear modulus are,but the change of damping ratio has no obvious rule.According to the plastic index IP,porosity e and effective confining pressure,an experience formula,which is suitable for calculating the maximum dynamic shear modulus of the deep seabed silty clay,is established.Based on the test results,the fitting parameters of envelope curves of dynamic shear modulus ratio Gd/Gdmaxand damping ratio λ versus dynamic strain γd for deep-sea marine silty clay are presented.
引文
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[3]郑维民.中国海洋工程地质研究[J].工程地质学报,1994,2(1):90-96(Zheng Weimin.Marine engineeringgeology research in China[J].Journal of EngineeringGeology,1994,2(1):90-96(in Chinese))
[4]Christian J T,Taylor P K,Yen J KC,et al.Largediameter under water Pipeline for nuclear power plantdesigned against soil liquefaction[C]//Proceedings of theSixth Annual Off-Shore Technology Conference.Houston,Texas,1974:597-606
[5]牛作民.渤海湾海相淤泥土工程物理性质的初步研究[J].海洋地质与第四纪地质,1986,6(3):35-42
[6]吕悦军,唐荣余,沙海军.渤海海底土类动剪切模量比和阻尼比试验研究[J].防灾减灾工程学报,2003,23(2):35-42(Lu Yuejun,Tang Rongyu,Sha Haijun.Experimental study on dynamic shear modulus ratio anddamping ratio of the soils of Bohai seafloor[J].Journal ofSeismology,2003,23(2):35-42(in Chinese))
[7]肖智旺,闫澍旺,刘润.海洋地基土的随机场特性[J].海洋技术,2005,24(4):73-79(Xiao Zhiwang,YanShuwang,Liu Run.Random field characters of propertiesof marine soil[J].Ocean Technology,2005,24(4):73-79(in Chinese))
[8]孔令伟,吕海波,汪稔,等.湛江海域结构性海洋土的工程特性及其微观机制[J].水利学报,2002(9):82-88(Kong Lingwei,Lu Haibo,Wang Ren,et al.Engineeringproperties and micro-mechanism of structural marine soil inZhanjiang sea area[J].Journal of Hydraulic Engineering,2002(9):82-88(in Chinese))
[9]潘华,陈国兴,孙田.原状海洋土动泊松比的试验研究[J].岩土力学,2011,32(增1):346-350(Pan Hua,Chen Guoxing,Sun Tian.Experimental research ondynamic Poissons ratio of undisturbed marine soil[J].Rock and Soil Mechanics,2011,32(S1):346-350(inChinese))
[10]Takaaki K.Moduli and damping factors of soft marine clays[J].Journal of Geotechnical Engineering,1992,118(9):1360-1375
[11]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程与工程振动,1995,15(1):73-84
[12]Koutsoftas D C,Fischer J A.Dynamic properties of twomarine clays[J].Journal of Geotechnical EngineeringDivision,ASCE,1980,106(6):645-657
[13]Saada A S,Macky T A.Integrated testing and properties ofa Gulf of Mexico clay[C]//Strength Testing of MarineSediments:Iaboratory and In-Situ Measurements.Philadelphia:ASTM,1985:363-380
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