山西粉土的动力特性试验研究
|
摘要
通过对山西地区代表性的粉土进行室内的共振柱试验及动三轴试验,研究了本地区粉土的动力特性和粉土在振动过程中孔隙水的变化规律,重点把粉土的共振柱试验结果与Seed和Idriss建议的砂土及饱和粘土的剪切模量比与剪应变(G/G0-γ)曲线和阻尼比与剪应变(D-γ)曲线的变化范围进行了对比分析。研究结果表明:粉土的剪模量比要比饱和砂土的大,其阻尼比小于砂土的阻尼比;粉土的抗液化强度与液化振次之间的关系可用乘幂函数来表示,其振动孔隙水压力的变化规律可以用二次抛物线拟合;结合了本地区的工程实践经验,可为工程设计与施工提供参考。
Through analyzing the testing results from the tests with free vibration column and with dynamic triaxial apparatus for the silts in Shanxi,the dynamic properties of the soils and the variation of pore water during the vibration are studied by the comparison with the variation range of G/G_0-γ and D-γ curves of sand and saturated clay recommended by Seed and Idriss.Testing results show that dynamic shear modulus ratio of silt is higher than that of general saturated sand,but its damping ratio is lower.The relationship between the liquefaction resistance of silt and the cyclic number may be expressed with power function,and its developing regulation of dynamic pore water pressure could be fitted with quadratic parabola function.Based on the local project experience,the results would provide the reference for the design and construction of similar projects.
Through analyzing the testing results from the tests with free vibration column and with dynamic triaxial apparatus for the silts in Shanxi,the dynamic properties of the soils and the variation of pore water during the vibration are studied by the comparison with the variation range of G/G_0-γ and D-γ curves of sand and saturated clay recommended by Seed and Idriss.Testing results show that dynamic shear modulus ratio of silt is higher than that of general saturated sand,but its damping ratio is lower.The relationship between the liquefaction resistance of silt and the cyclic number may be expressed with power function,and its developing regulation of dynamic pore water pressure could be fitted with quadratic parabola function.Based on the local project experience,the results would provide the reference for the design and construction of similar projects.
引文
[1]石兆吉,郁寿松,王余庆等.饱和轻亚粘土地基液化可能性判别[J].地震工程与工程振动,1984,4(3):71~81.
[2]刘雪珠,陈国兴.粘粒含量对南京粉细砂液化影响的试验研究[J].地震工程与工程振动,2003,23(3):150~155.
[3]阮永芬,巫志辉.饱和粉土的若干动力特性研究[J].土木工程学报,1995,17(4):100~106.
[4]黄博,陈云敏,殷建华等.粉土的动力特性及液化势研究[J].工程勘察,2001,(2):7~17.
[5]王翠莲,史三元.取样扰动对饱和粉土动力特性的影响[J].河北建筑科技学院学报,2003,17(4):53~55.
[6]俞炯奇,郑君,姜朴.Hardin-Drnevich模型的修正[J].浙江水利科技,2002,(4):87~88.
[7]Seed,H.B.and Idriss,I.M.Soil Moduli and DampingFactors for Dynamic Response Analyses[R].EERC,ReportNo.0~10,U.C.Berkely,Calif.1970.
[8]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
[2]刘雪珠,陈国兴.粘粒含量对南京粉细砂液化影响的试验研究[J].地震工程与工程振动,2003,23(3):150~155.
[3]阮永芬,巫志辉.饱和粉土的若干动力特性研究[J].土木工程学报,1995,17(4):100~106.
[4]黄博,陈云敏,殷建华等.粉土的动力特性及液化势研究[J].工程勘察,2001,(2):7~17.
[5]王翠莲,史三元.取样扰动对饱和粉土动力特性的影响[J].河北建筑科技学院学报,2003,17(4):53~55.
[6]俞炯奇,郑君,姜朴.Hardin-Drnevich模型的修正[J].浙江水利科技,2002,(4):87~88.
[7]Seed,H.B.and Idriss,I.M.Soil Moduli and DampingFactors for Dynamic Response Analyses[R].EERC,ReportNo.0~10,U.C.Berkely,Calif.1970.
[8]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心