Shear Properties of Asphalt Mixtures under Triaxial Compression
Shear Properties of Asphalt Mixtures under Triaxial Compression
复制标题
三轴压缩下沥青混合料的剪切性能
DOI：
10.3390/app9071489
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发表时间：
2019-04-01
影响因子：
2.7
通讯作者：
Li, Sheng
中科院分区：
文献类型：
--
作者：
Huang, Tuo;Qi, Shuai;Li, Sheng
为了研究围压和温度对沥青混合料剪切性能的影响，在40℃、50℃和60℃条件下，对国内广泛使用的连续级配AC（沥青混凝土）-13、开级配OGFC（开级配摩擦层）-13和间隙级配SMA（石胶沥青）-13沥青混合料进行了围压范围为0 ~ 1 MPa的三轴试验。提出了沥青混合料三轴强度的非线性回归/预测模型。结果表明，围压和温度对沥青混合料的抗剪性能有显著影响。随着温度的升高，沥青混合料的抗剪强度因粘聚强度的降低而逐渐降低；沥青混合料抗剪强度随围压的增大而增大。同时，随着围压的增大，黏聚力逐渐增大，摩擦角逐渐减小。当围压接近0.6 MPa时，Mohr-Coulomb破坏包络线向下弯曲，线性Mohr-Coulomb准则不适合描述沥青混合料的破坏行为。因此，提出了幂函数破坏包络线来表征沥青混合料的非线性剪切特性。提出了沥青路面材料和结构设计中抗剪参数（黏聚强度和摩擦角）的非线性演化规律。其中，间隙级配SMA-13沥青混合料抗剪破坏性能较好，被推荐作为提高沥青路面抗剪性能的上层材料。
In order to study the influences of confining pressure and temperature on the shear properties of asphalt mixtures, triaxial tests were conducted at 40 degrees C, 50 degrees C, and 60 degrees C, with the confining pressure ranges from 0 to 1 MPa for the widely used continuous-graded AC (Asphalt Concrete)-13, open-graded OGFC (Open-Graded Friction Course)-13, and gap-graded SMA (Stone Mastic Asphalt)-13 asphalt mixtures in China. A nonlinear regression/prediction model of triaxial strength for asphalt mixtures was proposed. The results show that confining pressure and temperature had a significant effect on the shear resistance of asphalt mixtures. With increasing temperature, the shear strength of the asphalt mixture gradually decreased due to the decreasing of cohesion strength; the shear strength of the asphalt mixture increased with the increase of confining pressure. Meanwhile, the cohesion strength increased and the friction angle decreased gradually with the increase of confining pressure. When the confining pressure was close to 0.6 MPa, the Mohr-Coulomb failure envelope bended down, so the linear Mohr-Coulomb criterion is not suitable to describe the failure behavior of asphalt mixtures. Therefore, a power function failure envelope was put forward to characterize the nonlinear shear properties of asphalt mixtures. The nonlinear evolutional laws of shear parameters, which includes cohesion strength and friction angle, were also proposed for asphalt pavement material and structure design. Among these asphalt mixtures, the gap-graded SMA-13 asphalt mixture exhibited better performance on the resistance to shear failure, and it was recommended as the upper layer material to improve the shear performance of asphalt pavement.