区域沉降对京津城际高铁北京段线路坡度影响分析  

Effect of regional subsidence on the line gradient of the Beijing-Tianjin inter-city high-speed railway

作　　者：杨艳[1,2] 杨红军 王荣[2] 周毅[2] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]北京市水文地质工程地质大队,北京100195 [3]湖南省邵东生态产业园,湖南邵阳422800

出　　处：《上海国土资源》2014年第2期13-16,共4页Shanghai Land & Resources

基　　金：北京市科委项目"北京地区地面沉降防控与地下水资源合理开发研究"(Z131100005613022);北京市政府财政项目"北京市地面沉降监测系统运行"(国土京环[2004]75)

摘　　要：地面沉降是北京平原区最主要的地质灾害之一,形成了多个沉降中心,其将对高速铁路运行的安全性产生不利影响.以我国首条高速城际轨道交通一京津城际高铁工程为例,分析铁路沿线地面沉降发育现状,以及该线路运营五年多来的差异沉降与坡度变化特征.结果显示,由区域沉降导致的差异沉降量较大,但沉降坡度变化目前仍处于高铁轨道平顺性的设计要求许可范围内.以该线路100年使用年限的设计指标为预测时段,按2013年度沉降速率及2008~2013年间的平均沉降速率分别估算因差异沉降而导致的线路坡度变化,其最大值为3‰左右,远低于20‰的设计临界线;但显著的累计沉降量无疑将影响线路维护及安全运行.指出须采取切实有效的地面沉降防治措施,以减缓高铁线路坡度的变化速率.Land subsidence is the one of the most serious geological hazards on the Beijing Plain. The plain covers an areaof more than 4000 km2 and has several centers of subsidence that may affect the safe and comfortable passage of high-speedtrains. A case study is made of the Beijing-Tianjin high-speed railway, on which trains achieve a top speed of 350 km/h. Thestudy analyzes the occurrence of land subsidence along the railway, the characteristics of the differential subsidence, andthe variation in gradient for a five-year period during which the railway was operating. The results show that the amount ofdifferential subsidence caused by regional subsidence has increased, but the changes in slope caused by the subsidencestill lie within the guidelines of the design requirements for high-speed rail. Using the design index with the line use fixed at100 years, and based on the 2013 rate of subsidence and the 2008–2013 average rate of subsidence, the maximum linegradient change due to differential subsidence is estimated at about 3‰, which is far less than the 20‰. design threshold.However, the cumulative amount of subsidence should still be regarded as potentially affecting the maintenance and safeoperation of the line. Therefore, measures should be taken to ensure the effective prevention and control of land subsidencein order to reduce as far as possible the rate of change in gradient of the high-speed railway.

关 键 词：地面沉降 差异沉降 线路坡度 京津城际高铁 地质灾害防治 

分 类 号：P642.26[天文地球—工程地质学]