振动频率对压实黄土动强度特性的影响
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摘要
利用动扭剪三轴仪对压实黄土进行了不同振动频率下的试验研究,分析了振动频率f对压实黄土的动强度和动强度参数的影响规律。研究表明,在一定围压下,压实黄土动强度均随振动频率f的升高而增大,与振动频率呈正相关关系;在试样振动频率确定的情况下,压实黄土的动强度随围压的增加而增大;压实黄土的动黏聚力cd和动内摩擦角φd均随着频率的增大而升高;动强度参数中cd和φd随振次的增加均呈减小并最终趋于稳定的趋势。
Shear failure of compacted loess in different frequencies is studied using a torsion shear apparatus and the effects of frequency on dynamic strength and dynamic strength parameter are investigated. (1) At a certain defined confining pressure, dynamic strength of compacted loess is increased with the rise of the frequency, showing a positive relation with frequency. (2) At a certain defined frequency, dynamic strength of compacted loess is increased with the rise of confining pressure. (3) Both dynamic cohesion and internal fraction angle of compacted loess are increased with the rise of frequency. (4) The dynamic cohesion and the internal fraction angle are decreased and tend to be steady with the increased vibration.
Shear failure of compacted loess in different frequencies is studied using a torsion shear apparatus and the effects of frequency on dynamic strength and dynamic strength parameter are investigated. (1) At a certain defined confining pressure, dynamic strength of compacted loess is increased with the rise of the frequency, showing a positive relation with frequency. (2) At a certain defined frequency, dynamic strength of compacted loess is increased with the rise of confining pressure. (3) Both dynamic cohesion and internal fraction angle of compacted loess are increased with the rise of frequency. (4) The dynamic cohesion and the internal fraction angle are decreased and tend to be steady with the increased vibration.
引文
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[2]潘林有,王军.振动频率对饱和软粘土相关性能的影响[J].自然灾害学报,2007,16(6):204-208.
[3]张建民,王稳祥,振动频率对饱和砂土动力特性的影响[J].岩土工程学报,1990.12(1):89-96.
[4]郭文,李强,王汝恒.振动频率对饱和砂卵石土动模量和动阻尼比影响的试验研究[J].四川建筑科学研究,2007,33(6):113-115.
[5]王建荣,张振中,王峻,等.振动频率对原状黄土本构关系的影响[J].西北地震学报,1999,21(3):310-314.
[6]陈存礼,胡再强.强夯地基黄土的动力特性参数及其振动频率的关系[J].西安.理工大学学报,1998,14(2):216-220.
[7]谢定义.土动力学[M].西安:西安交通大学出版社,1988.
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