自然状态和饱和水状态混凝土峰值应力、峰值应变及弹性模量的对比分析

Comparative Analysis of Peak Stress,Peak Strain and Elastic Modulus of Concrete under State of Nature and Water-saturated

为了研究湿态混凝土的力学性能,对不同应变速率(10-5、5×10-5、10-4s-1)、不同围压(0、4、8 MPa)下自然湿度和水饱和混凝土做了常三轴压缩试验,并对比分析了两种湿度混凝土在三轴试验下的峰值应力、峰值应变及弹性模量的变化情况。结果表明,在相同围压、相同应变速率下,水饱和混凝土峰值应力较自然湿度混凝土小,弹性模量较自然湿度混凝土大,两种湿度混凝土峰值应变变化无明显规律。围压对湿态混凝土抗压性能影响大于应变速率对湿态混凝土抗压性能的影响。

To study the mechanical properties of wet concrete, the ordinary triaxial compression test of natural hu- midity and water saturated concrete have been implemented under different strain rates （10、5×10^-5、10^-1S^-1） and confining pressures （0 MPa, 4 MPa, 8 MPa）. And the mechanical parameters （peak stress, peak strain and elastic modulus） change of two kinds of concretes are analyzed comparatively. The results show that the peak stress of water saturated concrete is less than that of natural humidity concrete, elasticity modulus of water saturated concrete is larger than that of natural humidity concrete under the same confining pressure and strain rate; but the peak strain of two kinds of humidity concrete have no obvious difference. The influence of confining pressures on compressive properties of humid ity concrete is greater than the impact of strain rate.