循环孔隙水作用下混凝土动态特性试验研究

发布时间：2018-04-22 11:36

本文选题：混凝土 + 孔隙水压力　；参考：《土木建筑与环境工程》2015年05期

【摘要】：对0、10、50次孔隙水循环下不同应变速率(10-5、10-4、10-3、10-2/s)的混凝土和中低应变速率(10-4、10-3/s)下不同孔隙水循环次数(0、10、50、100、200次)的混凝土进行了常三轴压缩试验,试件尺寸为ф300mm×600mm。对循环孔隙水压作用后混凝土的峰值应力物理力学参数的变化规律进行了统计分析,并对混凝土在不同加载速率下的吸能变化规律进行了分析。结果表明:随着应变速率增大,混凝土的峰值应力呈增大趋势,随孔隙水压循环次数的增加,峰值应力大体呈现先增大后减小的阶段性变化;混凝土的吸能能力随加载速率的增加,表现出明显增大的趋势。混凝土的吸能能力随孔隙水压循环次数的增加表现出一定的离散性,但整体上呈先增大后减小的趋势;选用基于Weibull统计理论的混凝土材料分段式动态损伤本构模型对试验数据进行拟合,经验证,此模型与试验结果吻合较好。
[Abstract]:The normal triaxial compression tests of concrete with different strain rates (10 ~ (-5) ~ 10 ~ (-4) ~ (10 ~ (-3)) ~ 10 ~ (-2) / s) and concrete with different pore water cycling times (n = 10 ~ (10 ~ (-4)) ~ (10 ~ (-3) / s)) under 50 pore-water cycles are carried out. The specimen size is 300mm 脳 600mm. The variation law of the physical and mechanical parameters of the peak stress of concrete under cyclic pore water pressure is statistically analyzed, and the law of energy absorption of concrete under different loading rates is analyzed. The results show that the peak stress of concrete increases with the increase of strain rate, and the peak stress increases firstly and then decreases with the increase of pore water pressure cycle times. The energy absorption capacity of concrete increases obviously with the increase of loading rate. The energy absorption capacity of concrete shows a certain dispersion with the increase of pore water pressure cycle times, but on the whole, it increases first and then decreases. The segmented dynamic damage constitutive model of concrete materials based on Weibull statistical theory is used to fit the experimental data. The results show that the model is in good agreement with the experimental results.
【作者单位】：三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心土木与建筑学院;
【基金】：国家自然科学基金(51279092) 三峡大学研究生科研创新基金项目(2014CX022)~~
【分类号】：TU528

【参考文献】