车辆动载下路基土竖向动应力及扩散规律
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摘要
推导了车辆动载作用下路基土中竖向动应力的求解方法,提出用速度系数来表征车辆动载下路基顶面产生的竖向动应力与车辆运行速度的关系,并模拟试验确定了速度系数的取值为0.105。原位监测试验表明:车辆动载在路基顶面产生的竖向动应力值约为0～16 kPa,大小与车辆载重及运行速度等因素有关。计算分析了5种类型车辆动载下路基土中竖向动应力的扩散规律。结果显示:随着深度增加,路基土中的竖向动应力逐渐减小,当路基土的深度超过8m时,所有类型车辆荷载在路基土中产生的竖向动应力不到路基顶面的10%;车辆载重越大,竖向动应力扩散速度越慢。
It put forward a method to calculate vertical dynamic stress of the subgrade under vehicle loads.Vertical stress of the subgrade soil under moving loads is different from the stress under inmobile loads,which can be described by "speed coefficient" and its value is 0.105.The dynamic stress on the top of the subgrade caused by the vehicle loads varies from 0 kPa to 16 kPa,and it will decrease as depth increases.When the depth of subgrade soil is more than 8m,the dynamic stress caused by vehicle loads is less than 10 percents of the stress on the top of the subgade soil.As the vehicle loads is bigger,the vertical dynamic stress diffuses slower.
It put forward a method to calculate vertical dynamic stress of the subgrade under vehicle loads.Vertical stress of the subgrade soil under moving loads is different from the stress under inmobile loads,which can be described by "speed coefficient" and its value is 0.105.The dynamic stress on the top of the subgrade caused by the vehicle loads varies from 0 kPa to 16 kPa,and it will decrease as depth increases.When the depth of subgrade soil is more than 8m,the dynamic stress caused by vehicle loads is less than 10 percents of the stress on the top of the subgade soil.As the vehicle loads is bigger,the vertical dynamic stress diffuses slower.
引文
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[2]Eason G.The stresses produced in a semi-infinite solid by a movingsurface force[J].International Journal of Engineering Science,1965,2:581-609.
[3]Lansing D L.The Displacements in an Elastic Half-Space due to aMoving Concentrated Normal Load[R].Washington,D.C.:Techni-cal Report R-238,National Aeronautics and Space Administration,1966.
[4]Hyodo M,Yasuhars K.Analytical procedure for evaluating pore-water pressure and deformation of saturated clay ground subjected totraffic loads[C]//Proceedings of the sixth International Conferenceon Numerical Methods in Geomechanics:Volumes 1-3.Rotterdam,Netherlands:AA Balkema,1988:653-658.
[5]凌建明,王伟,邬洪波.行车荷载作用下湿软路基残余变形的研究[J].同济大学学报:自然科学版,2002,30(11):1315-1320.Ling Jianming,Wang Wei,Wu Hongbo.On residual deformation ofsaturated clay subgrade under vehcile load[J].Journal of Tongji U-niversity:Natural Science,2002,30(11):1315-1320.
[6]王常晶,陈云敏.列车荷载在地基中引起的应力响应分析[J].岩石力学与工程学报,2005,24(7):1178-1186.Wang Changjing,Chen Yunming.Analasis of stresses in train-in-duced ground[J].Chinese Journal of Rock Mechanics and Engi-neering,2005,24(7):1178-1186.
[7]李金凤,梁乃兴,汪鑫洋,等.三轴重复荷载作用下AC-13沥青混合料永久变形试验分析[J].重庆交通大学学报:自然科学版,2012,31(1):54-58.Li Jinfeng,Liang Naixing,Wang Xinyang,et al.Analysis of AC-13asphalt mixture permanent deformation in triaxial repeated load test[J].Journal of Chongqing Jiaotong University:Natural Science,2012,31(1):54-58.
[8]黎冰,高玉峰,魏代现,等.车辆荷载的影响深度及其影响因素研究[J].岩土力学,2005,26(增刊1):310-313.Li Bing,Gao Yufeng,Wei Daixian,et al.Research on influentialdepth of vehicle loads and its influencing factors[J].Rock and SoilMechanics,2005,26(supp1):310-313.
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