围压作用下类岩材料动态力学特性研究

发布时间：2018-03-08 07:34

本文选题：类岩材料　切入点：动态荷载　出处：《混凝土》2017年12期 　论文类型：期刊论文

【摘要】：为了研究动荷载作用下不同围压水平对类岩材料混凝土力学特性的影响。从混凝土细观结构出发,建立混凝土随机骨料塑性损伤模型,根据混凝土破坏强度的数值试验确定方法,施加冲击荷载,计算了不同围压水平下混凝土的破坏强度和破坏位移,分析了不同围压水平下的破坏形态。结果表明:混凝土属于围压敏感性材料,加载速率不变,随着围压的不断增大,混凝土的动强度、破坏位移以及残余强度也在不断提高,两者成线性增长关系;围压不变,随着加载速率的提高,混凝土的动强度和破坏位移非线性提高,残余强度基本不变。围压大小不同,混凝土材料内部应力分布不同,导致混凝土的破坏类型发生变化,反映出破坏面形状和大小不同。该模型可以比较好的模拟围压作用下混凝土的动力特性。
[Abstract]:In order to study the influence of different confining pressure levels on the mechanical properties of rock-like concrete under dynamic loading, a plastic damage model of concrete random aggregate was established from the concrete mesoscopic structure. According to the numerical test method for determining the failure strength of concrete, the failure strength and displacement of concrete under different confining pressures are calculated by applying impact load. The failure patterns of concrete under different confining pressure levels are analyzed. The results show that concrete belongs to confining pressure sensitive material, and the loading rate is constant. With the increasing of confining pressure, the dynamic strength, failure displacement and residual strength of concrete are also increasing. With the increase of loading rate, the dynamic strength and failure displacement of concrete increase nonlinear, and the residual strength is basically unchanged. The stress distribution of concrete material is different with the size of confining pressure. This model can be used to simulate the dynamic behavior of concrete under confining pressure.
【作者单位】：陕西省土地工程建设集团有限责任公司;国土资源部退化及未利用土地整治工程重点实验室;西安理工大学岩土工程研究所;
【基金】：国家科技支撑计划项目(2014BAL01B03)
【分类号】：TU528

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