杨丰华,马艳霞,高英,李忠林

• 1:青海大学土木工程学院
• 2:青海省建筑节能材料与工程安全重点实验室
• 3:西安交通大学城市学院

摘要(Abstract)：

【目的】为了研究冻融循环作用和各向异性对西宁地区原状黄土力学特性及变形的影响，【方法】借助冻融循环试验箱和GDS双向动态三轴仪，开展冻融循环试验和施加半正弦波形式的循环荷载动力特性试验，采用修正H-D模型分析冻融循环次数、与沉积方向呈不同角度对西宁地区黄土动力特性参数的影响。【结果】结果显示：(1)随着冻融循环次数的增加，动剪切强度呈现出先减小后增加的趋势；黄土G_d~(-1)增长阈值呈现出先增大后减小的趋势；黄土阻尼比λ呈现出先增加后减小的趋势。(2)与沉积方向呈不同角度的土样动剪切强度具有差异性，即由大到小为0°>60°>90°>45°;G_d~(-1)增长阈值由大到小为45°>90°>60°>0°;黄土阻尼比λ由大到小为45°>90°>60°>0°。【结论】结果表明：(1)随着冻融循环次数的增加，土体结构强度和刚度均表现出先减弱后增强的趋势，土体抵抗变形消耗的动能则呈相反趋势。(2)各向异性影响黄土的动剪切强度、刚度及阻尼比，与沉积方向呈45°土体动剪切强度最低，刚度最弱，土体发生变形消耗动能最多。(3)冻融循环作用影响土体在不同方向的力学特性，随冻融循环次数的增加，与沉积方向呈45°时土体各向异性表现明显，其结构损伤程度最大。

关键词(KeyWords)： 原状黄土;冻融循环;各向异性;动力特性参数;修正H-D模型;力学性能;影响因素

Abstract:

Keywords:

基金项目(Foundation): 陕西省自然科学基础研究计划项目(2021-JQ-892)

作者(Author): 杨丰华,马艳霞,高英,李忠林

DOI: 10.13928/j.cnki.wrahe.2024.02.015

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