摘要
为研究疏干排水孔在既有铁路冻害治理中的布设方式,以疏干排水孔治理大准铁路K136+600~K136+938冻害段路基为工程背景,借助有限元软件针对排水孔间距、孔径、角度、长度等因素对路基内部含水率影响效果进行分析研究。研究结果表明:根据铁路路基实际尺寸合理选择排水孔间距,一般间距宜取1.0 m;排水孔孔径取0.1~0.2 m时排水效果最好;排水孔的倾斜角一般可设为3°~6°;排水孔的长度宜沿横向贯穿路基,布置时两侧错开布置,孔长为路基宽度1/2;对于大准铁路,排水孔宜设置在路基面以下1.5 m。该研究成果可为疏干排水孔治理既有铁路路基冻害工程设计提供理论依据。
In order to study the layout of dewatering drainhole which would be used in existing railway subgrade freezing damage,roadbed freezing damage is a common problem in the construction in cold regions.Section K136+600~K136+938 of the Datong-Junggar railway under construction in north China was taken as an engineering example,for which dewatering drainhole was used.The drainage effect affected by the spacing,aperture,angle,length of the dewatering drainhole were studied by numerical simulation with the finite element software.Based on the simulation results,the technological specifications of the best drainage effect should be:the spacing 1.0 m which depends on the size of subgrade,the aperture 0.1~0.2 m,and the angle 3°~6°.The length should run across the roadbed in the transverse direction,the drainhole should be staggered on both sides of the roadbed,and the length should be taken as the half of the subgrade width.For this railway,the drainage hole should be set 1.5 m below the subgrade surface.This study provided a theoretical guidance for the design of dewatering drainhole against railway subgrade freezing damage.
作者
李星
邓凯丰
舒中文
LI Xing;DENG Kai-feng;SHU Zhong-wen(China Railway Science Academy Co.,Ltd.,Chengdu 610032,China;Geosciences and Environmental Engineering College,Southwest Jiaotong University,Chengdu 610031,China)
出处
《科学技术与工程》
北大核心
2020年第24期10025-10031,共7页
Science Technology and Engineering
基金
国家自然科学基金(41530639,41877226)
国家重点研发计划(2017YFC1501000)
中国神华准能集团科研项目(SHGF-13-46,SHZN-17-41)。
关键词
铁路路基
疏干排水孔
数值分析
排水效果
参数
优化
railway subgrade
dewatering drainhole
numerical simulation
drainage effect
parameter
optimization
