温度对水工沥青混凝土强度及剪胀特性的影响试验研究  

Experimental Study on the Influence of Temperature on Strength and Dilatancy of Hydraulic Asphalt Concrete

作　　者：次仁云旦 王柳江[2,3] 扎西顿珠 毛航宇 李瑞平 CIREN Yun-dan;WANG Liu-jiang;TASHI Dun-zhu;MAO Hang-yu;LI Rui-ping(Xizang Hydraulic Waterpower Planning and Design Institution,Lhasa 850000,China;College of Water Conservancy and Hydropower,Hohai University,Nanjing 210098,China;International Joint Laboratory of Long-term Behaviour and Environmentally Friendly Rehabilitation Technologies of Dams,Nanjing 210098,China)

机构地区：[1]西藏自治区水利电力规划勘测设计研究院,拉萨850000 [2]河海大学水利水电学院,南京210098 [3]大坝长效特性及环保修复技术中西联合实验室,南京210098

出　　处：《长江科学院院报》2024年第1期190-195,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点研发计划项目(2022YFE0105000);国家自然科学基金项目(51979091,52009036);中央高校基本科研业务费专项(B210204021)。

摘　　要：为了解温度变化对沥青混凝土强度及剪胀特性的影响,开展了-1、5、10、15℃下的沥青混凝土三轴剪切试验。试验结果表明:沥青混凝土的强度变形特性与温度有密切关系,负温时,表现出明显的应变软化和剪胀性,随着温度的升高,应力-应变曲线转变为应变硬化型,且剪胀性减弱;沥青混凝土抗剪强度随温度升高而减小,且黏聚力的降低幅度明显大于内摩擦角,当温度从-1℃升高到15℃时,内摩擦角减小了4.7°,而黏聚力由1.11 MPa减小到0.28 MPa;沥青混凝土剪胀角随轴向应变增大而增大,并趋于稳定,两者关系可采用双曲线函数进行拟合;双曲线模型参数与温度有较好的相关性,可进一步考虑剪胀角随温度的变化情况。研究成果可为沥青混凝土的热-力耦合本构模型建立提供参考。To investigate the impact of temperature on the strength and dilatancy behaviors of hydraulic asphalt concrete,triaxial shear tests were conducted on asphalt concrete samples at controlled temperatures of-1℃,5℃,10℃,and 15℃.The results demonstrate a strong correlation between temperature and the mechanical response of the asphalt concrete.At temperatures below 0℃,the samples exhibit evident strain softening and dilatancy behaviors.However,as temperature rises,the strain softening transforms into strain hardening,and the degree of dilatancy decreases.Moreover,the shear strength of asphalt concrete reduces with increasing temperature,with the decrease in cohesion being more pronounced compared to the internal friction angle.Specifically,as temperature rises from-1℃to 15℃,the internal friction angle declines by 4.7°,while cohesion drops from 1.11 MPa to 0.28 MPa.Additionally,the dilatancy angle expands with the increase of axial strain and eventually stabilizes,exhibiting a suitable fit using a hyperbolic function.Remarkably,the parameters of the hyperbola model demonstrate a strong correlation with temperature,making them useful for developing a thermal-mechanic constitutive model for asphalt concrete.

关 键 词：沥青混凝土 温度 强度特性 剪胀特性 堆石坝 

分 类 号：TU455[建筑科学—岩土工程]