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利用三峡大学自行研制的大型多功能三轴材料试验机,完成了4种侧应力等级和3个数量级加载速率的C30混凝土立方体试件双向受压试验,系统地探讨了不同侧应力和不同加载速率下混凝土的强度特性及变形特性。研究表明,侧应力和应变速率都能提高混凝土的应变峰值,但侧应力对混凝土的应变峰值的影响较应变速率的影响大;随着侧应力的增加,混凝土的率敏感性逐渐降低;在有侧应力的情况下,随应变速率的增加,混凝土弹性模量变化逐渐减小;随应变速率的增加,应力应变曲线上升段更加陡峭,曲线更加饱满,混凝土剩余强度越来越高;双轴受压情况下,混凝土的应力应变曲线下降段趋势比无侧应力状态下较平缓,随侧应力的增加下降段曲线越来越平缓,混凝土的应力应变曲线更加饱满,峰值点无明显尖峰出现,混凝土剩余强度越来越高。
Using the large-scale multi-functional triaxial material testing machine developed by the Three Gorges University, the biaxial compression tests of C30 concrete cube specimens with four kinds of lateral stress levels and three orders of magnitude loading rates were completed. The influences of different lateral stresses and different loading rates Strength and Deformation Characteristics of Lower Concrete. The results show that both the lateral stress and strain rate can increase the peak value of concrete strain, but the effect of lateral stress on the peak value of concrete strain is greater than that of strain rate. With the increase of lateral stress, the sensitivity of concrete decreases gradually. With the increase of strain rate, the elastic modulus of concrete decreases gradually with the increase of strain rate. With the increase of strain rate, the ascending section of stress-strain curve is steeper and the curve is more full, and the residual strength of concrete is higher and higher. Under the condition of pressure, the trend of the descending section of the stress-strain curve of the concrete is smoother than that of the un-stress state. The curve of the descending section of the concrete becomes more and more gentle with the increase of the lateral stress, and the stress-strain curve of the concrete becomes more full with no obvious spikes at the peak point. The remaining strength is getting higher and higher.