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本文进行了孔隙水压不同循环次数(0次,10次,50次,100次和200次)以及不同应变速率下(10~(-5)/s,10~(-4)/s,10~(-3)/s和10~(-2)/s)混凝土常规三轴压缩试验,分析了混凝土峰值应变的变化规律、应力-应变曲线及损伤特性。结果表明:相同循环次数孔隙水压下,峰值应变随应变速率增加,整体呈现出增加的趋势;而相同应变速率下,峰值应变随孔隙水压循环次数的变化规律并不明显;在中低应变速率(10~(-5)~10~(-3)/s)下,混凝土的损伤变化受孔隙水压循环次数影响较大;当循环次数达到200次时,孔隙水压作用对混凝土产生较大的损伤。通过对循环孔隙水作用下混凝土动态损伤破坏机理的分析可知:混凝土的破坏过程实际上是内部裂纹不断形成、扩展、贯通,材料损伤不断产生、累积的过程;当损伤达到一定程度,混凝土发生宏观破坏,失去承载力。
In this paper, the pore water pressure of different cycles (0 times, 10 times, 50 times, 100 times and 200 times) and different strain rates (10 ~ (-5) / s, 10 ~ (-4) ~ (-3) / s and 10 ~ (-2) / s), the variation of peak strain, stress-strain curve and damage characteristics of concrete were analyzed. The results show that under the same strain rate, the peak strain increases with the strain rate, and the trend of peak strain changes with the pore water pressure at the same strain rate. (10 ~ (-5) ~ 10 ~ (-3) / s), the damage of concrete is greatly affected by the number of pore water pressure cycles. When the number of cycles reaches 200, the effect of pore water pressure on the concrete Big damage. The analysis of dynamic damage and damage mechanism of concrete under cyclic pore water shows that the failure process of concrete is actually the continuous formation and expansion of internal cracks and the continuous accumulation and accumulation of material damage. When the damage reaches a certain level, Destruction, loss of capacity.