Han Xiaoning, Hu Zaiqiang, Yu Liangshu, Pang Yuan, She Haicheng, Zhang Longfei, Wang Xiaoliang, Qi Changjun
Institute of Geotechnical Engineering, Xi'an University of Technology, Xi'an 710048, China.
School of Urban Construction, Yangtze University, Jingzhou 434032, China.
Materials (Basel). 2023 Oct 1;16(19):6529. doi: 10.3390/ma16196529.
To reveal the dynamic characteristics of asphalt core embankment dams (ACEDs), we carried out a dynamic triaxial experiment on hydraulic asphalt concrete (HAC) under different temperatures ( = 4 °C, 10 °C, 16 °C, and 22 °C) and stress states ( 1.0, 1.2, 1.4, and 1.6; = 0.5, 0.6, 0.7, and 0.8 MPa). The results indicate that HAC's maximum dynamic elastic modulus increased with decreasing temperature, increasing principal stress ratio, and increasing confining pressure. However, the damping ratio showed the opposite trend. Moreover, in order to study the deformation capacity of HAC, 300 cyclic loads were applied to some specimens. At a temperature of 22 °C, the specimens had a tendency to deform axially, but not significantly. With a decrease in temperature, the axial deformation tendency of the specimen gradually weakened or even disappeared. However, a small number of cracks appeared in the aggregate and between the asphalt and the aggregate of the specimen. In order to quantify the dependence of dynamic parameters on temperature, the temperature influence factor of the maximum dynamic elastic modulus and the temperature sensing factor of the damping ratio were defined. The variation in the temperature influence factor of the maximum dynamic elastic modulus with temperature can be described by a logistic function. The temperature sensing factor of the damping ratio increased with an increasing principal stress ratio and peripheral pressure. Finally, maximum dynamic elastic modulus and damping ratio computational models for the interaction of temperatures and stress states were developed using the normalization method. Upon comparison, the dynamic parameters were observed to be very close to those listed in the literature, which verifies the applicability of the computational models of the maximum dynamic elastic modulus and damping ratio.
为揭示沥青心墙土石坝（ACEDs）的动力特性，我们对水工沥青混凝土（HAC）在不同温度（ = 4℃、10℃、16℃和22℃）和应力状态（ 1.0、1.2、1.4和1.6； = 0.5、0.6、0.7和0.8MPa）下进行了动力三轴试验。结果表明，HAC的最大动弹性模量随温度降低、主应力比增加和围压增加而增大。然而，阻尼比呈现相反的趋势。此外，为研究HAC的变形能力，对部分试件施加了300次循环荷载。在22℃温度下，试件有轴向变形的趋势，但不明显。随着温度降低，试件的轴向变形趋势逐渐减弱甚至消失。然而，试件的骨料以及沥青与骨料之间出现了少量裂缝。为量化动力参数对温度的依赖性，定义了最大动弹性模量的温度影响因子和阻尼比的温度敏感因子。最大动弹性模量的温度影响因子随温度的变化可用逻辑函数描述。阻尼比的温度敏感因子随主应力比和围压的增加而增大。最后，采用归一化方法建立了温度与应力状态相互作用下的最大动弹性模量和阻尼比计算模型。经比较，发现动力参数与文献中列出的参数非常接近，这验证了最大动弹性模量和阻尼比计算模型的适用性。
