行车荷载作用下水泥混凝土路面板角隅脱空数值仿真分析
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摘要
为了研究行车荷载作用下,水泥混凝土路面板角隅不同脱空状态对路面板面层的影响,通过有限元软件ADINA,考虑真实轮胎荷载作用,针对轮胎在不同轴载作用下、不同脱空面积以及非脱空状态下建立的9块水泥混凝土路面板有限元分析模型,分析在不同工况作用下的脱空状态(角隅脱空)对路面结构作用力的影响。结果表明:通过对不同脱空状态仿真数据的分析,得出在角隅不脱空和角隅脱空的情况下,当路面基层脱空时,角隅不脱空处面层的弯沉和弯拉应力明显大于角隅脱空面层的弯沉和弯拉应力,脱空区域上的面层最大弯沉和最大弯拉应力是非脱空时的1.13倍和1.36倍,可以看出脱空区对于路面结构非常不利;对于不同脱空面积下的角隅脱空,随着脱空面积的增大,脱空区域内路面板面层的动力响应显著增大;对于相同脱空面积下且不同轴载的角隅脱空状态下,随着轴载的逐渐增大,脱空区域内路面板面层的弯沉和弯拉应力应逐渐增大。因此采取交通管制、及时注浆或者灌浆和降低轴载等补救措施可以有效的减缓含水脱空区域水泥混凝土路面板结构的破坏。
In order to study the influence of the different hollow state of the cement concrete pavement angle on the pavement surface layer under the driving load,the finite element software ADINA is used to consider the real tire load, and the tires are different under different axle loads and different voids.The finite element analysis model of 9 cement concrete pavements established under the area and non-empty state, analyzes the effect of the void state(cornering void)under different working conditions on the force of pavement structure.The results show that by analyzing the simulation data of different void states, it is concluded that when the corners of the pavement are emptied,the corners of the pavement are not emptied.Thebending stress is obviously larger than the deflection and bending stress of the corner layer, and the maximum deflection and maximum bending stress of the surface layer in the void area are 1.13 times and 1.36 times that of the non-empty area. It can be seen that the void area is very unfavorable for the pavement structure; for the voids under different voiding areas, the dynamic response of the pavement surface layer in the void area increases significantly with the increase of the void area; for the same void area and different axle load, with the increase of axle load, the deflection and tension stress of the pavement surface in the void area should gradually increase.Therefore,remedial measures such as traffic control, timely grouting or grouting and reduction of axle load can effectively alleviate the damage of cement concrete pavement structure in water-containing void area.
In order to study the influence of the different hollow state of the cement concrete pavement angle on the pavement surface layer under the driving load,the finite element software ADINA is used to consider the real tire load, and the tires are different under different axle loads and different voids.The finite element analysis model of 9 cement concrete pavements established under the area and non-empty state, analyzes the effect of the void state(cornering void)under different working conditions on the force of pavement structure.The results show that by analyzing the simulation data of different void states, it is concluded that when the corners of the pavement are emptied,the corners of the pavement are not emptied.Thebending stress is obviously larger than the deflection and bending stress of the corner layer, and the maximum deflection and maximum bending stress of the surface layer in the void area are 1.13 times and 1.36 times that of the non-empty area. It can be seen that the void area is very unfavorable for the pavement structure; for the voids under different voiding areas, the dynamic response of the pavement surface layer in the void area increases significantly with the increase of the void area; for the same void area and different axle load, with the increase of axle load, the deflection and tension stress of the pavement surface in the void area should gradually increase.Therefore,remedial measures such as traffic control, timely grouting or grouting and reduction of axle load can effectively alleviate the damage of cement concrete pavement structure in water-containing void area.
引文
[1]彭永恒,李想.基于板底脱空的水泥混凝土路面动力特性分析[J].黑龙江大学自然科学学报,2016,33(2):244-250.
[2]李想,彭永恒.板底脱空对水泥混凝土路面板动力响应分析[J].北京工业大学学报,2017,43(12):1922-1929.
[3]赵茂才.水泥混凝上路面板下脱空对使用寿命的影响分析[J].公路交通科技,2004,21(2):1-4.
[4]陈开国.水泥混凝土路面板底脱空区域动水压力分布特性研究[J].公路,2018,1(1):20-25.
[6]HANSEN E C,HANNESEN R J,ARMAGHANI J M.Field effects of water pumping beneath concrete pavement slabs[J].Journal of transportation engineering,ASCE,1991,117(6):679-696.
[7]AASHTO(American Association of State Highway and Transportation Officials).AASHTO guide for design of pavement structures[S].Washington D C,1993.
[2]李想,彭永恒.板底脱空对水泥混凝土路面板动力响应分析[J].北京工业大学学报,2017,43(12):1922-1929.
[3]赵茂才.水泥混凝上路面板下脱空对使用寿命的影响分析[J].公路交通科技,2004,21(2):1-4.
[4]陈开国.水泥混凝土路面板底脱空区域动水压力分布特性研究[J].公路,2018,1(1):20-25.
[6]HANSEN E C,HANNESEN R J,ARMAGHANI J M.Field effects of water pumping beneath concrete pavement slabs[J].Journal of transportation engineering,ASCE,1991,117(6):679-696.
[7]AASHTO(American Association of State Highway and Transportation Officials).AASHTO guide for design of pavement structures[S].Washington D C,1993.