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基于剪切弹性柔量的基-面层间接触状态及路面力学响应分析

Keywords: 道路工程,层间接触状态,剪切弹性柔量,力学响应,疲劳寿命

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Abstract:

为研究半刚性基层与沥青面层的层间接触状态对路面结构力学响应和疲劳寿命的影响,选取典型半刚性基层沥青路面结构,采用Bisar3.0软件中的剪切弹性柔量参数AK作为基-面层层间接触状态的评价指标进行路面结构力学计算,分析不同层间接触状态下沥青路面结构的应力、应变、弯沉等力学指标的变化规律,并计算了层间不同接触状态下路面结构的疲劳寿命.结果显示剪切弹性柔量可以较好的表征基-面层层间接触状态;弯拉应力和剪应力受基-面层间接触状态的影响较大,当基-面层间接触状态由连续变为滑动时,沥青层底弯拉应力的涨幅为528.25%,沥青层底剪应力的涨幅为157.3%,而弯沉受基-面层间接触状态的影响较小;基-面层间保持连续的接触状态可以提高层间抗剪切能力,延长路面的使用寿命.

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