车辆载重与动荷载对X形桩桩-网复合地基动力特性影响的试验研究
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摘要
基于大比例模型试验,采用半正弦波模拟移动车辆荷载,通过开展不同车辆载重和动荷载作用下X形桩桩-网复合地基的动力特性模型试验,分析桩身动应力、土拱效应、动土压力、垫层应力传递系数、格栅动应变等的变化规律,初步揭示了车辆载重和动荷载对X形桩桩-网复合地基的影响机制。试验结果表明,车辆动荷载对X形桩桩身动应力的影响深度约为2 m;车辆载重和动荷载的增加会导致桩间土承受更多的动应力,并且会降低路肩处土工格栅的作用;但是,路基中心的垫层应力传递系数几乎保持不变;土工格栅的动应变比超过0.048时,格栅累积变形会随着车辆载重和动荷载的增加迅速增大。
The dynamic characteristics of X-section cast-in-situ concrete(XCC) pile-geogrid composite foundation under half sine wave loading simulating different static and dynamic loads from a moving vehicle axle are investigated in large-scale model tests.The dynamic stress of an XCC pile, soil arching, dynamic soil pressure, the stress transfer coefficient of the cushion, dynamic strain of the geogrid are analyzed. The mechanism of XCC pile-geogrid composite foundation influenced by the static and dynamic loads of vehicles is preliminarily revealed. The test results show that the influence depth of dynamic loads on stress of an XCC pile is 2 meters.More dynamic stresses are supported by the soil between piles and the effect of a geogrid on the road shoulder is weakened with the increasing of the static and dynamic loads. The stress transfer coefficient of the cushion located in the center of subgrade is constant with the increasing of the static and dynamic loads. The cumulative deformation of a geogrid increases rapidly with the increasing of the static and dynamic loads as the value of the ratio of dynamic strain is over 0.048.
The dynamic characteristics of X-section cast-in-situ concrete(XCC) pile-geogrid composite foundation under half sine wave loading simulating different static and dynamic loads from a moving vehicle axle are investigated in large-scale model tests.The dynamic stress of an XCC pile, soil arching, dynamic soil pressure, the stress transfer coefficient of the cushion, dynamic strain of the geogrid are analyzed. The mechanism of XCC pile-geogrid composite foundation influenced by the static and dynamic loads of vehicles is preliminarily revealed. The test results show that the influence depth of dynamic loads on stress of an XCC pile is 2 meters.More dynamic stresses are supported by the soil between piles and the effect of a geogrid on the road shoulder is weakened with the increasing of the static and dynamic loads. The stress transfer coefficient of the cushion located in the center of subgrade is constant with the increasing of the static and dynamic loads. The cumulative deformation of a geogrid increases rapidly with the increasing of the static and dynamic loads as the value of the ratio of dynamic strain is over 0.048.
引文
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[4]曹海莹,朱毅,刘云飞,等.车辆荷载作用下双层路基层间动应力响应试验研究[J].振动与冲击,2017,36(5):30-36.CAO Hai-ying,ZHU Yi,LIU Yun-fei,et al.Tests for interlayer dynamic stress response of a two-layer roadbed under vehicle load[J].Journal of Vibration and Shock,2017,36(5):30-36.
[5]李洪亮,王晓华,沈可.天津滨海新区重载交通工作区深度的分析[J].土木工程学报,2011,44(增刊1):158-161.LI Hong-liang,WANG Xiao-hua,SHEN Ke.Analyses of the working depth of the heavy vehicle loads in Tianjin Binhai New Area[J].China Civil Engineering Journal,2011,44(Suppl.1):158-161.
[6]李皓玉,杨绍普,齐月芹,等.移动随机荷载下沥青路面的动力学特性和参数影响分析[J].工程力学,2011,28(11):159-165.LI Hao-yu,YANG Shao-pu,QI Yue-qin,et al.Dynamics of asphalt pavement under moving stochastic loads and parameter analysis[J].Engineering Mechanics,2011,28(11):159-165.
[7]孙璐,邓学钧.速度与车辆动态特性对于车路相互作用的影响[J].土木工程学报,1997,30(6):34-40.SUN Lu,DENG Xue-jun.The influences of speed and dynamic characteristics of truck on vehicle-pavement interactions[J].China Civil Engineering Journal,1997,30(6):34-40.
[8]LIU HAN-LONG,ZHOU HANG,KONGGANG-QIANG.XCC pile installation effect in soft soil ground:a simplified analytical model[J].Computers and Geotechnics,2014,62:268-282.
[9]LüYA-RU,LIU HAN-LONG,NG C W W,et al.Three-dimensional numerical analysis of the stress transfer mechanism of XCC piled raft foundation[J].Computers and Geotechnics,2014,55:365-377.
[10]LüYA-RU,LIU HAN-LONG,DING XUAN-MING,et al.Field tests on bearing characteristics of 404X-section pile composite foundation[J].Journal of Performance of Constructed Facilities,2011,26(2):180-189.
[11]刘汉龙,刘芝平,王新泉.现浇X形混凝土桩截面几何特性的分析[J].中国铁道科学,2009,30(1):17-23.LIU Han-long,LIU Zhi-ping,WANG Xin-quan.Analysis on section geometry character of X style vibro-pile[J].China Railway Science,2009,30(1):17-23.
[12]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,2002,30(11):1315-1320.LING Jian-ming,WANG Wei,WU Hong-bo.On residual deformation of saturated clay subgrade under vehicle load[J].Journal of Tongji University,2002,30(11):1315-1320.
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[15]郑俊杰,张军,马强,等.路桥过渡段桩承式加筋路堤现场试验研究[J].岩土工程学报,2012,34(2):355-362.ZHENG Jun-jie,ZHANG Jun,MA Qiang,et al.Experimental investigation of geogrid-reinforced andpile-supported embankment at bridge approach[J].Chinese Journal of Geotechnical Engineering,2012,34(2):355-362.