列车提速对路基竖向位移的影响及加固效果评价  

Influence of Train Speed on Vertical Displacement of Subgrade and Evaluation of Reinforcement Effect

作　　者：张文月 ZHANG Wenyue(School of Applied Science and Engineering,Fuzhou Institute of Technology,Fuzhou 350506,China)

机构地区：[1]福州理工学院应用科学与工程学院,福建福州350506

出　　处：《沈阳大学学报（自然科学版）》2022年第2期140-145,共6页Journal of Shenyang University：Natural Science

基　　金：福建省中青年教师教育类科研项目(JAT200908);福州理工学院校级科研基金资助项目(FTKY21041)。

摘　　要：为探究列车提速对路基竖向位移的影响,依托兰新铁路乌鲁木齐―奎屯段线路中典型的路基工程,采用MIDAS GTS/NX有限元软件建立了基床-路基-地基三维模型,对比了不同列车运行速度以及单双线运行条件下路基表面的竖向位移时程曲线。分析结果表明:当列车运行速度为100 km·h^(-1)时,竖向位移值为1.81 mm,满足规范要求;当列车提速至双线120 km·h^(-1)、单线140 km·h^(-1)运行时,竖向位移值超过2 mm,未达到规范要求;采用斜向高压旋喷桩加固后,路基的治理效果明显,列车可提速至140 km·h^(-1)运行。To explore the influence on the vertical displacement of the subgrade under the condition of train speed,relying on a subgrade engineering from Urumqi to Kuitun line and using MIDAS GTS/NX,bed-subgrade-foundation three-dimensional model was established.The time history curve of vertical displacement was compared in different train speed and running conditions of single or double-line.The results show that,when the train speed is 100 km·h^(-1),the vertical displacement is 1.81 mm,which meets the specification requirements;when the train speed is increased to 120 km·h^(-1) for double-line and 140 km·h^(-1) for single-line,the vertical displacement exceeds 2 mm,which fails to meet the specification requirements;after reinforcement by inclined high pressure rotary jet grouting pile,the train speed can be increased to 140 km·h^(-1),and the reinforcement effect of subgrade is obvious.

关 键 词：列车 提速 铁路路基 竖向位移 数值模拟 高压旋喷桩 

分 类 号：TU473.1[建筑科学—结构工程]