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发泡颗粒混合轻量土三轴应力-应变-孔压特性试验

, PP. 10-17

Keywords: 道路工程,轻量土,三轴试验,孔压,应变硬化,应变软化

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Abstract:

?通过三轴试验对淤泥发泡颗粒混合轻量土进行研究,揭示了不同配比、围压对轻量土应力-应变-孔压特性的影响本质,以及变形模量的变化规律;并结合前人成果,对应力-应变关系进行了模型概化与曲线拟合;基于发泡颗粒混合轻量土的物质结构组成特性,提出了一个反映其物理力学性质的广义本构模型。分析结果表明:配比决定试样的胶结结构强度,围压决定试样的应力状态,围压大于胶结结构强度时,试样剪缩,应变硬化,孔压不断上升,反之,试样剪胀,应变软化,孔压上升后下降,甚至出现负值;变形模量随水泥掺入比的增大而线性增大,随EPS颗粒掺入比的增大而非线性减小,与围压关系不大;概化模型有应变硬化型、应变软化型及理想弹塑型3种;Ducan-Chang双曲线模型与Prevost软化模型的拟合效果较好,但软化模型很难对应变大于15%的曲线进行拟合。

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