列车移动荷载引起的地基土应力状态变化
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摘要
将列车移动荷载简化为多组轮轴荷载,通过多点加载模拟列车在轨道路基结构上的移动过程。以遂渝线板式无砟轨道路基结构为对象,应用FLAC 3D软件建立轨道-路基-场地三维动力分析模型,对轨道、路基结构的动力响应进行分析,细致分析了列车荷载移动过程中作用线正下方地基中土单元的应力路径和主应力轴的旋转现象。结果表明:地基土单元动力响应具有明显循环特征;主应力轴始终沿顺时针方向旋转,且连续旋转了180°。
The travelling load of train should be simplified as a plurality of wheel-axle loads,a nd the moving process of a train on the track subgrade structure was simulated by multi-point loading.Taking the subgrade structure of slab ballastless track in Suining-Chongqing railway as an object,a three-dimensional dynamic analysis model of tracksubgradesite was established by applying FLAC 3D,the dynamic response of track and subgrade structure was analyzed,and the rotation of stress path and principal stress axis of foundation soil elements beneath the action line during the travelling of train load was studied in detail.The results showthat the dynamic response of foundation soil elements has obvious cycle characteristics in theaction of a plurality of wheel-axle loads,and the main stress axis always rotates in a clockwise direction,which rotates 180 degrees continuously.
The travelling load of train should be simplified as a plurality of wheel-axle loads,a nd the moving process of a train on the track subgrade structure was simulated by multi-point loading.Taking the subgrade structure of slab ballastless track in Suining-Chongqing railway as an object,a three-dimensional dynamic analysis model of tracksubgradesite was established by applying FLAC 3D,the dynamic response of track and subgrade structure was analyzed,and the rotation of stress path and principal stress axis of foundation soil elements beneath the action line during the travelling of train load was studied in detail.The results showthat the dynamic response of foundation soil elements has obvious cycle characteristics in theaction of a plurality of wheel-axle loads,and the main stress axis always rotates in a clockwise direction,which rotates 180 degrees continuously.
引文
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[12]沈扬,周建,龚晓南,等.主应力轴循环旋转对超固结黏土性状影响试验研究[J].岩土工程学报,2008,30(10):1514-1519.
[13]吴宏伟,施群.深基坑开挖中的应力路径[J].土木工程学报,1999,32(6):53-58.
[2]陈云敏,陈仁朋,芦森.软土地基地铁施工及运营过程中的几个土力学问题[C]//同济大学,浙江大学.城市地铁建设与环境岩土工程高级技术论坛论文集.杭州:浙江大学出版社,2002:165-177.
[3]边学成,陈云敏,胡婷.基于2.5维有限元方法分析列车荷载产生的地基波动[J].岩石力学与工程学报,2006,25(11):2335-2342.
[4]丁智,葛国宝,魏新江,等.地铁列车运营引起的地基土应力状态变化分析[J].岩土工程学报,2013,35(增2):647-651.
[5]刘雪珠,陈国兴,储勇.列车引起的地基土应力状态变化的三维有限元分析[J].地震工程与工程振动,2010,30(2):159-167.
[6]边学成,胡婷,陈云敏.列车交通荷载作用下地基土单元体的应力路径[J].土木工程学报,2008,41(11):86-92.
[7]王常晶,陈云敏.列车移动荷载在地基中引起的主应力轴旋转[J].浙江大学学报(工学版),2010,44(5):950-954.
[8]陈国兴,潘华.轨道交通振动作用引起的土单元应力路径特征及其在室内试验中的模拟[J].土木工程学报,2010,43(增):340-345.
[9]肖军华,洪英维,吴楠.交通荷载引起主应力轴旋转下软黏土特性试验[J].地下空间与工程学报,2015,11(6):1522-1527.
[10]沈扬,陶明安,王鑫,等.交通荷载引发主应力轴旋转下软黏土变形与强度特性试验研究[J].岩土力学,2016,37(6):1569-1578.
[11]王常晶,温日琨,陈云敏.交通荷载引起的主应力轴旋转室内试验模拟探讨[J].岩土力学,2008,29(12):3412-3416.
[12]沈扬,周建,龚晓南,等.主应力轴循环旋转对超固结黏土性状影响试验研究[J].岩土工程学报,2008,30(10):1514-1519.
[13]吴宏伟,施群.深基坑开挖中的应力路径[J].土木工程学报,1999,32(6):53-58.