砂土与硫酸腐蚀混凝土接触面剪切试验研究

发布时间：2018-06-20 21:11

本文选题：硫酸腐蚀 + 土与混凝土接触面　；参考：《岩土力学》2017年09期

【摘要】：为了研究酸腐蚀作用对桩-土接触面剪切特性的影响,利用大型多功能界面剪切仪,进行了砂土与被硫酸加速腐蚀0、31、93、154 d的混凝土板之间接触面剪切试验,量测了不同腐蚀时间的混凝土与砂土接触面的剪切应力和剪切位移关系。研究结果表明:砂土与硫酸腐蚀混凝土接触面剪切应力与剪切位移符合双曲线模型,接触面剪切破坏符合摩尔-库仑准则。随着腐蚀时间的增加,接触面黏聚力减小,摩擦角、剪切强度以及达到峰值剪切应力所需的剪切位移增大,接触面的破坏趋向于土体自身剪切破坏。取未腐蚀混凝土与砂土接触面达到峰值剪应力时的剪切位移为基准,对该位移对应的不同腐蚀时间下混凝土与砂土接触面的剪切应力进行对比分析,发现腐蚀5个月后的剪切应力要小于未腐蚀时的剪切应力。按双曲线模型对试验测得的接触面剪切应力和剪切位移关系进行了拟合,获得了该模型中的参数,为进一步进行数值模拟提供参考。
[Abstract]:In order to study the effect of acid corrosion on the shear characteristics of pile-soil interface, a shear test was carried out between sand and concrete slabs with accelerated corrosion of sulfuric acid for 0 ~ 31 ~ 3154 d by using a large multifunctional interface shear meter. The relationship between shear stress and shear displacement of the interface between concrete and sand with different corrosion time was measured. The results show that the shear stress and shear displacement of the interface between sand and sulphuric acid corrosion concrete are in accordance with the hyperbolic model, and the shear failure of the contact surface conforms to the Mohr Coulomb criterion. With the increase of corrosion time, the cohesive force of the contact surface decreases, the friction angle, shear strength and the shear displacement required to reach the peak shear stress increase, and the failure of the contact surface tends to the shear failure of the soil itself. Taking the shear displacement of the interface between uncorroded concrete and sand as the benchmark, the shear stress of the interface between concrete and sand under different corrosion time corresponding to the displacement is compared and analyzed. It is found that the shear stress after 5 months corrosion is smaller than that without corrosion. According to the hyperbolic model, the shear stress and shear displacement of the contact surface measured in the experiment are fitted, and the parameters of the model are obtained, which provides a reference for further numerical simulation.
【作者单位】：广东工业大学土木与交通工程学院;同济大学建筑工程系;
【基金】：国家自然科学基金资助项目(No.51208373) 上海市浦江人才计划(No.12PJ1409000)~~
【分类号】：TU470

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