高速公路路面混凝土结构性能研究

Study on Performance of Expressway Pavement Concrete Structure

【目的】混凝土结构的性能对于高速公路路面稳定性具有重要的影响。【方法】本研究采用室内试验和理论推导的手段,对高速公路路面混凝土结构性能进行研究。建立单轴压缩模型,分析材料非线性力学行为。建立屈曲力学模型,分析结构整体屈曲。【结果】研究结果表明:材料受压过程可分为4个阶段:裂隙压密阶段、弹性阶段、塑性阶段及峰后阶段;材料的失稳破坏,是由于裂隙的失稳扩展产生的。当细观裂隙形成后,材料沿细观裂隙发生剪切破坏;在车载、支撑压力及横向挤压力的作用下,路面出现两侧凹陷—中间鼓起的现象。【结论】本研究针对混凝土非线性力学性能,分析其整体屈曲行为,掌握其力学性能,为现代化高速公路建设提供依据,为以后对混凝土结构性能研究提供技术支持。

[Purposes]The performance of concrete structures has a significant impact on the stability of highway pavement.[Methods]This study uses indoor experiments and theoretical derivation methods to study the structural performance of concrete on highway pavement.Moreover,this paper establishes a uniaxial compression model to analyze the nonlinear mechanical behavior of materials and establishes a buckling mechanics model to analyze the overall buckling behavior of the structure.[Findings]The research results indicate that the material compression process can be divided into four stages:crack compaction stage,elastic stage,plastic stage,and post peak stage;The instability and failure of materials are due to the unstable expansion of cracks.After the formation of micro cracks,the material undergoes shear failure along the micro cracks;Under the action of the vehicle,support pressure,and lateral squeezing force,the road surface appears to have concave sides and bulging in the middle.[Conclusions]This study focuses on the nonlinear mechanical properties of concrete,analyzes its overall buckling behavior,grasps its mechanical properties,provides a basis for modern highway construction,and provides technical support for future research on the performance of concrete structures.