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为了研究西宁地区非饱和黄土的动力特性,文中利用GDS动三轴仪进行室内动三轴试验,研究了不同振次、含水率和固结比对西宁地区非饱和黄土滞回圈、动弹性模量,轴向应变的影响。结果表明:当振动次数增加时,滞回圈由应变轴左侧向右侧移动,且由稀疏变得紧密,含水率、固结比越大滞回圈越靠近应变大的方向;随着含水率的升高非饱和黄土的动弹性模量减小,轴向应变增加;随着固结比的增大动弹性模量增大,轴向应变也增大;动弹性模量和固结比具有相同的增减特性,轴向应变和含水率、固结比也都具有相同的增减特性。研究结果可为交通荷载作用下非饱和黄土地区动力特性的研究和防灾减灾提供参考。
In order to study the dynamic characteristics of unsaturated loess in Xining, indoor dynamic triaxial tests were carried out using GDS dynamic triaxial apparatus. The effects of different vibration times, water cut-off rates and consolidation ratios on the dynamic response of unsaturated loess hysteresis loops, dynamic elastic modulus Volume, the impact of axial strain. The results show that when the vibration frequency increases, the hysteresis loop moves from the left to the right of the strain axis and becomes close by the sparseness. The larger the water content and consolidation ratio, the closer the hysteresis loop is to the direction of larger strain. The dynamic elastic modulus of unsaturated loess decreases and the axial strain increases. The elastic modulus increases as the consolidation ratio increases, and the axial strain increases. The dynamic elastic modulus and consolidation ratio With the same increase and decrease characteristics, axial strain and moisture content, consolidation ratio also have the same increase and decrease characteristics. The results can provide reference for the dynamic characteristics of the unsaturated loess area under traffic load and disaster prevention and mitigation.