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为研究不同孔隙水压循环次数、不同加载速率下的混凝土的力学性能,对直径为300 mm,高度为600 mm的混凝土试件进行0,10,50,100,200次循环孔隙水压的预处理(孔隙水压的上限为3 MPa,下限为1 MPa),然后在3 MPa的围压下进行4种应变速率(10-5,10-4,10-3,10-2/s)下的常三轴(σ2=σ3≥σ1)抗压性能试验。结果表明:随着应变速率的不断增加,混凝土的峰值应力增大,峰值应变整体上呈增大的趋势;随着循环孔隙水压次数的不断增加,混凝土的峰值应力呈阶段性变化,100次之前呈增大趋势,100次之后呈减小趋势,峰值应变无明显规律性变化,弹性模量呈减小趋势。
In order to study the mechanical properties of concrete with different pore hydraulic pressure cycles and different loading rates, pore pressures of 0, 10, 50, 100 and 200 cycles were pretreated for concrete specimens with a diameter of 300 mm and a height of 600 mm The upper limit of pressure is 3 MPa and the lower limit is 1 MPa), and then under the confining pressure of 3 MPa, the three triaxial axes of four kinds of strain rate (10-5, 10-4, 10-3, 10-2 / s) (σ2 = σ3 ≥ σ1) compression resistance test. The results show that with the increase of strain rate, the peak stress of concrete increases and the peak strain increases as a whole. With the increase of the number of circulating pore water pressure, the peak stress of concrete changes stepwise, 100 times Before it, it showed a tendency of increasing. After 100 times, it showed a decreasing trend. There was no obvious regularity of peak strain and a decreasing tendency of elastic modulus.