振动频率对压实黄土动强度特性的影响  

Effects of Vibration Frequency on Dynamic Strength Properties of Compacted Loess

作　　者：李焱[1] 骆亚生[1] 谭东岳[1] 杨利国[1] 付中原[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《水土保持通报》2009年第4期130-133,共4页Bulletin of Soil and Water Conservation

基　　金：国家自然科学基金资助项目(50578134);教育部新世纪优秀人才支持计划(NECT-06-0864)

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 posi- tive 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 in- creased 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.

关 键 词：压实黄土 振动频率 动强度 动强度参数 

分 类 号：TU411.8[建筑科学—岩土工程]