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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第9期    总第265期    2016年9月

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文章编号:1672-7207(2016)09-3225-06
三轴压缩条件下沥青混合料中间主应力效应及破坏准则
黄拓,李亦鹏,郑健龙

(长沙理工大学 公路工程教育部重点实验室,湖南 长沙,410004)

摘 要: 针对沥青混合料强度试验方法及沥青路面设计采用的最大拉应力理论没有考虑中间主应力影响的问题,利用自主研发的三轴试验装置及方法,对AC-13C沥青混合料开展三向压缩试验,包括常规三轴强度试验及中间主应力试验,观察试件的破坏形态。建立三向压缩条件下AC-13C沥青混合料的八面体强度理论计算式。研究结果表明:随着侧向压力的增大,试件破坏形态逐渐从拉应变破坏转变为斜剪破坏;沥青混合料在三轴压缩条件下的强度明显大于单轴抗压强度;中间主应力对沥青混合料强度有显著影响:当中间主应力逐渐增大时,三轴破坏强度逐渐增大,但强度增长幅度逐渐减小;所建立的三向压缩条件下AC-13C沥青混合料的八面体强度理论计算式可为沥青路面材料及结构按三维应力状态设计提供参考;建议采用能够反映中间主应力效应的强度理论作为沥青混合料的破坏准则。

 

关键词: 沥青混合料;三轴试验方法;中间主应力效应;三向压缩状态;破坏准则

Intermediate principal stress effect and failure criterion of asphalt mixture under triaxial compression state
HUANG Tuo, LI Yipeng, ZHENG Jianlong

Key Laboratory of Highway Engineering, Ministry of Education, Changsha University of Science & Technology,
Changsha 410004, China

Abstract:To solve the problem that strength test methods of asphalt mixture and the maximum tensile stress theory of asphalt pavement design do not consider the effect of intermediate principal stress, three-direction compression tests including conventional triaxial strength test and intermediate principal stress test were carried out on AC-13C asphalt mixture with self-developed triaxial test machine and test method. Besides, failure characteristics of specimens were observed. The octahedral failure criterion of AC-13C asphalt mixture was established under triaxial compression state. The results indicate that failure mode of specimen gradually changes from tensile strain failure to shear failure with the increase of the lateral pressure. The strength of asphalt mixture in three-direction compression state is obviously greater than uniaxial compression strength. Intermediate principal stress has significant effect on asphalt mixture’s strength, and it should be taken into account. Triaxial failure strength increases with the increase of intermediate principal stress, but the range of strength gradually decreases. The octahedral failure criterion of AC-13C asphalt mixture provides theoretical reference for material and structure design of asphalt pavement under three-dimensional stress state. The strength theory which can reflect the effect of intermediate principal stress is suggested to be used as asphalt mixture’s failure criterion.

 

Key words: asphalt mixture; triaxial test method; intermediate principal stress effect; triaxial compression state; failure criterion

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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