摘要
为了建立脱空状态下水泥路面疲劳寿命预估方程,基于ANSYS建立板底脱空的水泥路面力学模型,计算其荷载应力和温度应力,分析其较已有计算方法产生偏差的主要影响因素,提出相关修正系数。然后,利用层次分析法确定板底脱空状态下相关脱空修正系数各个影响因素所占权重。最后,根据数据统计结果,运用多元非线性回归方法确定其修正系数计算方法,并构建最终板底脱空下疲劳寿命预估方程,为水泥路面板设计及后期维护提出依据。结果表明:荷载大小及脱空半径对荷载应力影响较大,分别可以达到0.5~1.3倍和0.1~0.5倍,对疲劳寿命影响达到0.6~1倍和0.7~1倍;脱空半径及深度对温度应力影响较小,但在温度梯度下影响较大,达到11.6%,对疲劳寿命影响最大达到0.5倍;面板厚度小于300 mm时,水泥路面板受力状况不利,疲劳寿命骤降。
In order to establish a prediction equation for fatigue life of cement pavement with voids,the finite element software ANSYS was used to establish a mechanical model of a cement pavement with voids at bottom of the pavement panel. Load stress and temperature stress of the pavement were calculated,and main factors influencing error of existing calculation methods were analyzed,Coefficient of correction was proposed. Then,the analytic hierarchy process was used to determine the weight of each factor on the coefficient of correction. Finally,according to the statistical data,amethod to calculate the correction coefficient was determined by using the multiple nonlinear regressions,and an equation for fatigue life prediction of the pavement with voids was obtained. The basis of cement pavement design and post-maintenance were put forward. The results show that the influence of load magnitude and void radius on load stress is large,which can reach 0. 5 - 1. 3 times and 0. 1 - 0. 5 times,respectively,and their effect on fatigue life can reach 0. 6 - 1 times and 0. 7 -1 times,respectively; that the influence of void radius and depth on temperature stress is small,but it becomes 11. 6% larger under temperature gradient,and their maximum impact on fatigue life can reach 0. 5 times. When the thickness of the panel is less than 300 mm,surface stress of the pavement surface is unfavorable,and the fatigue life drops abruptly.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2018年第1期304-313,共10页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金青年科学基金资助项目(51408480)
交通运输部西部建设科技项目(20113187721260)
陕西省教育厅专项科研计划项目(16JK1424)
陕西省自然科学基金基础研究计划面上项目(2017JM5026)
