摘要
为了研究沥青混合料弯曲试验、直接拉伸试验和劈裂试验的拉应变破坏原因,采用不同试验方法对沥青混合料强度特性进行研究,得到沥青混合料强度、破坏应变和临界应变能密度参数随加载速度的变化规律。研究结果表明:沥青混合料强度和临界应变能密度随加载速度的增大而增大;以极限承载能力作为破坏准则,导致在强度参数取值时存在随意性问题,影响路面结构设计的科学性;拉应变是导致沥青混合料发生破坏的主因;以主拉应变作为破坏准则,可以通过加载速度统一不同试验方法的各个力学参数,解决沥青混合料强度的不确定性问题和破坏原因不明的问题。
In order to study the failure reason in bending test, tensile test and split test of asphalt mixture,strength-loading velocity characteristics with various loading modes were carried out, and the change laws of strength,failure strain and critical strain energy density parameters with various loading rates were obtained. The results show that strength and critical strain energy density increase with the increase of loading rate. Taking ultimate bearing capacity as failure criterion leads to the randomness of the selected strength, and affects the pavement structure design. Tensile strain is the main factor leading to the failure of asphalt mixture. Taking principal tensile strain as failure criterion can unite various mechanical parameters and solve the problems that the strength of asphalt mixture is uncertain and the cause of failure is unknown.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第8期2820-2827,共8页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51038002,51578081,51408064)
湖南省科技计划项目(2014TT2032)
长沙理工大学公路工程教育部重点实验室开放基金资助项目(kfj130103)~~
关键词
沥青混合料
强度特性
主拉应变
破坏准则
asphalt mixture
strength characteristics
principal tensile strain
failure criterion
