基于长时序水准监测数据的北京东北部地区地面沉降趋势分析

Analysis and Study of Land Subsidence Trend in Northeast Beijing Based on Long Time Series Leveling Monitoring Data

以北京东北部某在建高铁线路为背景,基于沿线水准基准点多年时序的高程数据对该地区的地面沉降进行分析,发现其处于快速发展阶段且区域沉降不均匀:距离市区较近的人口密集区域沉降量较大,并以国家铁道试验中心铁路环行试验线、马泉营村和顺义区高丽营镇区域最为严重。整体的水准点沉降监测数据表明,从顺义区进入怀柔区后出现了地面沉降明显变小的趋势。随着季节的变化也体现了不同的沉降趋势,11月~次年3月的沉降量较小,这表明北京地区冬季地下水消耗量较少(小于降雨补给量),并且冻结后地面沉降相对较为稳定;6月~8月为北京夏季用水高峰期,地下水的大量抽取导致了较为严重的地面沉降。

Based on years of elevation data of time series of leveling datum points along a high-speed rail line under construction in the northeast of Beijing,the ground settlement in northeast Beijing is analyzed.It is found that ground settlement is in a rapid development stage and the regional settlement is uneven.Settlement in densely populated areas close to urban area is large.The national railway test center,the Railway Circle Test Line,Maquanying Village and Gaoliying Town in Shunyi District are the most serious spots.Overall monitoring data of level point settlement indicates that there is a trend of ground settlement decrease while entering Huairou District from Shunyi District.With seasonal changes,the settlement is also different.Precipitation from November to March of the next year is smaller,which indicates that ground water use in Beijing is less in winter(less than rainfall recharge)and the ground settlement after freezing is relatively stable.June to August is the peak period of summer water use in Beijing with a large amount of ground water extraction which leads to more ground settlement.