振动法水泥稳定砾石的力学疲劳特性与强度标准
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国家自然科学基金资助项目(51408044);中国博士后科学基金特别资助项目(2015T80999);陕西省自然科学基金资助项目(2017JM5034);中央高校基本科研业务费专项资金资助项目(310821172008,310821171018)


Mechanical and Fatigue Properties as Well as Strength Criteria of Cement Stabilized Gravel Produced by Vibration Compaction Method
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    摘要:

    为确保振动法水泥稳定砾石(VTMCSG)基层在交通荷载反复作用下不出现疲劳破坏,研究了VTMCSG的疲劳特性与不同龄期的力学强度(无侧限抗压强度、劈裂强度与抗压回弹模量);基于路面荷载响应、VTMCSG的力学与疲劳特性,结合Miner疲劳累积损伤理论,提出了抗疲劳开裂的VTMCSG强度标准.结果表明:VTMCSG力学强度随水泥剂量的增加呈线性增加、随养生龄期的延长呈非线性增长,采用骨架密实级配可提高VTMCSG的力学强度;所建立的VTMCSG强度增长方程可较为精确地表征其强度增长特性;当试验条件受限时,可利用所建立的力学指标间的关系模型来预估其他力学强度.通过回归分析建立的VTMCSG疲劳方程表明,在高应力水平下骨架密实级配VTMCSG的疲劳性能优于悬浮密实级配VTMCSG;提出了控制疲劳开裂的VTMCSG的7d无侧限抗压强度标准与7d劈裂强度标准,该标准与路面结构、VTMCSG的材料属性以及使用寿命相关联,实现了结构与材料一体化控制VTMCSG基层开裂的目的.

    Abstract:

    Mechanical strength and fatigue properties of cement stabilized gravel produced by vibration compaction method(VTM CSG) were studied. The strength criteria of VTM CSG against fatigue failure was proposed based on the load response of pavement, mechanical and fatigue properties of VTM CSG as well as Miners theory of fatigue accumulation. The results show that the mechanical properties(unconfined compressive strength; splitting strength and compressive resilient modulus) of VTM CSG enhance linearly with the increase of cement content, and increase nonlinearly with the increase of curing age. The VTM CSG with skeleton dense structure shows better mechanical properties. The growth equation of VTM CSG strength can accurately describe the characteristics of strength growth. When the test conditions were limited, the mechanical index relationship equation can be used to predict the other mechanical strengths. The fatigue equation of VTM CSG is put forward, and the fatigue properties of skeleton dense gradation is better than that of suspension dense gradation under high stress level. The compressive strength and splitting strength criteria of VTM CSG against fatigue failure are proposed, which are correlated with pavement structure and layer material properties and service life. The goal of structure material integrated control of VTM CSG base fracture is realized.

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纪小平,王涛,周泽洪,张宜洛.振动法水泥稳定砾石的力学疲劳特性与强度标准[J].建筑材料学报,2018,21(5):761-768

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  • 收稿日期:2017-12-10
  • 最后修改日期:2018-01-13
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  • 在线发布日期: 2018-10-31
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