循环荷载下压实黄土动强度特性研究

摘要

Moving mountains to fill out the ditch is a new measure to deal with the shortage of construction land inloess areas.Conducting dynamic strength characteristics research on compacted loess has important theoretical andpractical significance for largescale site formation of moving mountains to fill out the ditches in loess areas of highseismic intensity.This paper uses GDS vibrating triaxial to study the dynamic strength characteristics of Lvliangcompacted loess under different conditions of the moisture content,dry density and loading frequency.The resultsshow that the dynamic strength reduces with the increasing of moisture content and increases with the increasing ofdry density and loading frequency.The moisture content has significant effect on the dynamic strength of compactedloess.The dynamic strength of compacted loess decreases with the increasing of vibration times.Linear equationsunder a semi-logarithmic coordinate can be used to fit their relationship.%移山填沟进行新区建设或修建机场，是黄土地区应对建设用地不足而采取的一项新措施。进行压实黄土的动强度特性研究，对高烈度黄土地区大规模移山填沟具有重要的理论和现实意义。本文利用 GDS振动三轴仪对吕梁压实黄土的动强度特性进行了研究，分析了含水率、干密度和加载频率对其动强度的影响规律。结果表明：压实黄土的动强度随含水率的增大而减小，随干密度和加载频率的增加而增大；含水率对压实黄土的动强度影响显著；压实黄土的动强度随着振次的增加而减小，用半对数坐标系下的直线方程拟合效果较好。