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工程力学  2013 

吕梁地区压实马兰黄土变形与抗剪强度特性

DOI: 10.6052/j.issn.1000-4750.2012.06.0441, PP. 108-114

Keywords: 压实马兰黄土,抗剪强度,变形特性,割线模量,变形系数

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Abstract:

针对吕梁地区压实马兰黄土的变形及抗剪强度特性开展了压缩及直剪试验研究,分析了初始压实度及初始含水量与抗剪强度指标之间的关系及其对土体压缩变形的影响,并基于割线模量法提出了压实马兰黄土在初始压实度及初始含水量变化时的变形修正公式。研究结果表明:压实马兰黄土初始含水量w及初始压实度K与粘聚力c及内摩擦角#x003c6;呈线性关系;在不考虑压实度及含水量的影响时,侧限压缩应变#x003b5;与垂直压力p关系可用#x003b5;=kpn表达;压实马兰黄土割线模量Esoi与K呈线性关系,且与1/w的关系曲线与抛物线非常相似。建立的压实马兰黄土在初始压实度及初始含水量变化时的变形修正公式可以用于吕梁地区压实马兰黄土填筑地基变形分析与计算。

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