辽西风积土动力特性实验研究
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摘要
通过一系列动态三轴实验,研究了原状饱和辽西风积土在不同固结压力条件下的动态强度、动态弹性模量和阻尼比。结果表明,辽西风积土的破坏动态强度随着固结围压和固结应力比的增大而增大,而动态剪切强度明显区别于静态剪强度;其动态弹模量随着固结应力比和固结围压的增加而增加,而阻尼比随着固结应力比和固结围压的增大而减小。同时,分别拟合得到最大动态弹模量和最大阻尼比与有效固结应力的关系式,并且对动态弹模量和阻尼比进行了归一化处理。
Through a series of dynamic triaxial tests,the dynamic strength,the dynamic elastic modulus and damping ratio of saturated original aeolian soil from west Liaoning Province were studied under different consolidation pressure conditions.Results indicate that the failure dynamic strength of aeolian soil increases along with the ambient consolidation pressure and consolidation stress ratio increasing,and the dynamic shearing strength is obviously different from the static one;its dynamic elastic modulus increases along with the consolidation stress ratio and ambient consolidation pressure increasing,but the damping ratio change presents an opposite trend.Meanwhile,equations describing the relation of the maximum dynamic elastic modulus and the maximum damping ratio with the effective consolidation stress were fitted respectively,and dynamic elastic modulus and damping ratio were normalized.
Through a series of dynamic triaxial tests,the dynamic strength,the dynamic elastic modulus and damping ratio of saturated original aeolian soil from west Liaoning Province were studied under different consolidation pressure conditions.Results indicate that the failure dynamic strength of aeolian soil increases along with the ambient consolidation pressure and consolidation stress ratio increasing,and the dynamic shearing strength is obviously different from the static one;its dynamic elastic modulus increases along with the consolidation stress ratio and ambient consolidation pressure increasing,but the damping ratio change presents an opposite trend.Meanwhile,equations describing the relation of the maximum dynamic elastic modulus and the maximum damping ratio with the effective consolidation stress were fitted respectively,and dynamic elastic modulus and damping ratio were normalized.
引文
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[2]Hardin B O,Black W L.Vihration modulars of normal consolidated clay[J].J Soil Meth Found Div,ASCE,1968,94(SM2):353-369.
[3]Hardin B O,Drnevich V P.Shear modulus and damping in soils design equation curves[J].J Soil Meth FoundDiv,ASCE,1972,98(7):279-287.
[4]Hardin B O,Black W L.Closure to vibration modulus of normally consolidated clay:design equations and curves[J].J Soil Meth Found Div,1969,95(6):1531-1537.
[5]Hardin B O,Drnevich V P.Shear modulus and damping in soil:measurement and parameter effects[J].J SoilMeth Found Div,ASCE,1972,98(6):603-624.
[6]黄文熙.土的工程性质[M].北京:水利电力出版社,1983(Huang Wenxi.Soil engineering characteristics[M].Beijing:China WaterPower Press,1983(in Chinese))
[7]谢定义.中国土动力学的发展现状与存在的问题[J].西北地震学报,2007,29(1):94-95(Xie Dingyi.Developing Situation and Problem of Soil Dynamic in China[J].Northwestern Seismological Journal,2007,29(1):94-95(in Chinese))
[8]高玉峰,黎冰.黏土与EPS颗粒混合轻质土的动强度特性试验研究[J].岩石力学与工程学报,2007,26(增2):4276-4283(Gao Yufeng,Li Bing.Experimential Study on Dynamic Strength Properties of Lightweigtht ClayMixed with EPS Beads Soil[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(supp.2):4277-4283(in Chinese))
[9]谢定义.土动力学[M].西安:西安交通大学出版社,1988(Xie Dingyi.Soil Dynamics[M].Xi’an:Xi’anJiaotong University Press,1988(in Chinese))
[10]Seed H B,Idriss I M.Simplified procedure for evaluatio soil liquefaction potential[J].J Soil Mech Found Div,ASCE,1971,97(9):1249-1273.
[11]张克绪,谢君斐.土动力学[M].地震出版社,1989(Zhang Kexu,Xie Junwen.Soil Dynamics[M].TheEarthquake Press,1989(in Chinese))
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