风积沙在循环荷载作用下的变形特性试验研究

发布时间：2018-03-12 17:21

本文选题：风积沙　切入点：塑性应变　出处：《武汉理工大学学报》2014年06期 　论文类型：期刊论文

【摘要】：通过动三轴试验研究了风积沙在循环荷载作用下的累积塑性应变特点,分析了围压、循环荷载大小、偏压固结比、初始静偏应力和循环荷载作用频率对累积塑性应变的影响,得出了风积沙在循环荷载作用下的累积塑性应变特点,根据循环荷载的大小应变类型可以分为4种:稳定型、缓慢增加型、匀速增加型和突然增大型。当围压为20kPa时,其临界动应力水平D的取值范围为:0.27D0.33。风积沙的累积塑性应变随着循环荷载大小、初始静偏应力的增加而增大,随着围压、偏压固结比和荷载作用频率的增加而减小。提出了一种针对动应力水平较低时风积沙累积塑性应变模型,并验证了模型的正确性。
[Abstract]:The characteristics of cumulative plastic strain of eolian sand under cyclic load are studied by dynamic triaxial test. The effects of confining pressure, cyclic load size, biasing consolidation ratio, initial static deflection stress and cyclic load action frequency on cumulative plastic strain are analyzed. The characteristics of cumulative plastic strain of eolian sand under cyclic load are obtained. According to the strain types of cyclic load, there are four types of strain: stable type, slow increasing type, uniform increasing type and sudden increasing large type. When the confining pressure is 20 KPA, the plastic strain can be divided into four types: stable type, slow increasing type, uniform increasing type and sudden increasing large type. The critical dynamic stress level D is in the range of: 0.27D 0.33.The cumulative plastic strain of eolian sand increases with the increase of cyclic load and initial static deflection stress, and increases with confining pressure. A model of cumulative plastic strain of aeolian sand at low dynamic stress level is proposed and verified by the increase of the ratio of partial compression and consolidation and the frequency of load action.
【作者单位】：长安大学公路学院;
【基金】：西部交通建设科技项目(2011318797600)
【分类号】：U414

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