杭州地区软土层土质特性研究
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摘要
通过对杭州地区典型软土层(第①、第②软土层)土质力学特性、动剪切模量比和阻尼比的分析,详细探讨了杭州地区第①、第②软土层压缩指标、抗剪强度指标与物理指标之间的分布规律和相关性,拟合了相应的经验回归公式,发现了第①、第②软土层动剪切模量比G/Gm ax、阻尼比λ与剪切应变γ之间的关系,并利用M artin-davidenkov模型和陈国兴等建议的阻尼比经验公式进行了拟合,给出了拟合曲线和拟合参数推荐值,从而得到小应变条件下,杭州地区软土层动剪切模量比G/Gm ax和阻尼比λ随剪切应变γ变化的参考值,有利于杭州地区第①、第②软土层动力特性的认识。
According to the mechanical features of the soil characters of the typical soft soil layers(such as the first and the second soft-soil layer) of Hangzhou,the analysis of the dynamic shear modulus ratio and the damping ratio,the paper explores the compression indexes,the distribution law of the shearing strength index and the relevance of the first and second soft-soil indexes in Hangzhou,fits the respective experiential regression formulae,finds the relationship among the dynamic shear modulus G/Gmax,the damping ratio λ and the shear strain γ,and undertakes the fitting for the damping ratio experience formula by applying Martin-davidenkov model and the suggestions from Chen Guoxing and others,and provides the fitting curve and the fitting recommend value,so as to obtain the reference value for the changes of the dynamic shear modulus G/Gmax,the damping ratio λ along with the changes of the shear strain γ in smaller strain condition,so as to have the better understanding of the mechanical features of the first and second soft-soil layers in Hangzhou.
According to the mechanical features of the soil characters of the typical soft soil layers(such as the first and the second soft-soil layer) of Hangzhou,the analysis of the dynamic shear modulus ratio and the damping ratio,the paper explores the compression indexes,the distribution law of the shearing strength index and the relevance of the first and second soft-soil indexes in Hangzhou,fits the respective experiential regression formulae,finds the relationship among the dynamic shear modulus G/Gmax,the damping ratio λ and the shear strain γ,and undertakes the fitting for the damping ratio experience formula by applying Martin-davidenkov model and the suggestions from Chen Guoxing and others,and provides the fitting curve and the fitting recommend value,so as to obtain the reference value for the changes of the dynamic shear modulus G/Gmax,the damping ratio λ along with the changes of the shear strain γ in smaller strain condition,so as to have the better understanding of the mechanical features of the first and second soft-soil layers in Hangzhou.
引文
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[3]寇秉厚.杭州市区地质概况及工程地质、水文地质条件[R].杭州:杭州市勘测设计研究院,1996.
[4]杭州市勘测设计研究院.杭州地铁1号线初步勘察报告[R].2002.
[5]金兴平,杨迎晓,李辉煌.杭州地铁1#线岩土工程问题探讨[J].岩石力学与工程学报,2005,24(S2):5680-5684.
[6]顾明光,汪庆华,卢成忠,等.杭州城市平原区三维第四系结构调查研究方法探讨[J].中国地质,2008,35(2):232-237.
[7]陈晓平,黄国怡,梁志松.珠江三角洲软土特性研究[J].岩石力学与工程学报,2003,22(1):137-141.
[8]SL237-1999,土工试验规程[S].
[9]Martin P P,Seed B H.One-d imensions dynam ic ground responseanalyses[J].American Soc iety of C ivil Engineering,1982,108(7):935-954.
[10]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程和工程振动,1995,15(1):73-84.
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