季节性冻土区高速铁路路基冻胀的井点降水整治数值分析  

Numerical Analysis on Regulation Scheme for Subgrade Frost Heaving of High Speed Railway by Well Point Dewatering in Seasonal Frozen Soil Region

作　　者：周阳宗[1,2] 朱宏伟[3,4] 蔡德钩[3,4] 闫宏业[3,4] 李中国[3,4] 姚建平[3,4] 

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410012 [2]中国铁建十六局集团有限公司,北京100048 [3]中国铁道科学研究院铁道建筑研究所,北京100081 [4]中国铁道科学研究院高速铁路轨道技术国家重点实验室,北京100081

出　　处：《中国铁道科学》2016年第4期9-14,共6页China Railway Science

基　　金：中国铁路总公司科技研究开发计划项目(2014G003-A;2014G003-B;2015G006-H);中国铁道科学研究院铁道科学技术研究发展中心项目(J2014G003)

摘　　要：针对地下水较为发育的季节性冻土区高速铁路路堑地段易发生路基冻胀的情况,采用数值模拟方法,运用SEEP/W软件,进行路基冻胀的井点降水整治研究。结果表明：抽水量为1.5m^3·h^-1的小型水泵在埋深为5～7m的条件下,连续工作约1.3～1.4h可将其周围的水位降至泵底;井点降水整治中,水泵埋深取为6.7m较为合理;取水泵合理的埋深为6.7m时,为在入冬前将路堑中的地下水位降低到3.8m,需抽水25d;入冬后为确保水位在最大冻深3.0m以下,并同时考虑到节能,可采取间隔抽水方式,而暂停抽水后路堑中心地下水位从3.8m回升到3m需要7.5d（水泵最大间歇时间）,然后启动水泵再次将水位从3.0m降至3.8m的抽水时间需要6d。依据数值分析结果在试验段采用井点降水整治后,路基的最大冻胀量从2013年的11.6mm降至2014年的4.5mm,路基的冻胀整治效果较为显著,表明根据数值分析结果制定的井点降水整治方案是合理的。In allusion to the situation that subgrade frost heaving occurred easily in the cutting of high speed railway in seasonal frozen soil region with more developed groundwater,study was conducted through numerical simulation by software SEEP/W on the regulation scheme for subgrade frost heaving by well point dewatering.Results show that,under the condition that the pump discharge of small water pump was 1.5m^3·h^-1 and the buried depth ranged from 5to 7m,the water level around the pump could be lowered to its bottom after continuous working for about 1.3to 1.4h.The pump buried depth of 6.7m was more reasonable in well point dewatering.With this buried depth,25 d was needed to pump the groundwater level in the cutting down to 3.8mbefore winter.In winter,pumping with intervals could be adopted to ensure the groundwater level below 3.0 m of the maximum freezing depth and considering energy conservation.After the suspension of pumping,it would take 7.5d（the maximum intermittent time of water pump）to raise the groundwater level at the cutting center from 3.8to 3.0 m.Then,it would take 6dfor the groundwater level down to 3.8magain when the water pump was started to work once again.After the test section was regulated by well point dewatering according to simulation analysis results,the maximum subgrade frost heaving was decreased from 11.6 mm in 2013 to 4.5 mm in 2014.The regulation effect for subgrade frost heaving is remarkable,which indicates the regulation scheme by well point dewatering set down according to simulation analysis results is reasonable.

关 键 词：路基冻胀 井点降水 渗流分析 施工参数 季节性冻土区 高速铁路 路堑 

分 类 号：U213.14[交通运输工程—道路与铁道工程] U216.417