北京平原区第四系地下水水位变化规律的再认识  

Re-understanding of the variation laws of Quaternary groundwater in Beijing Plain

作　　者：刘元章[1] 武强[2] 高志辉[1] 林沛[1] 韩佂[1] 

机构地区：[1]北京市水文地质工程地质大队,北京100195 [2]中国矿业大学(北京)水害防治与水资源研究所,北京100083

出　　处：《工程勘察》2013年第5期43-47,共5页Geotechnical Investigation & Surveying

基　　金：北京市平原区地下水污染调查项目(PXM2009-158305-074498)

摘　　要：通过对监测井多年水位资料的分析,尤其是利用分层监测井进行分层分析,对本区的水位变化规律进行了重新认识,认为大致可分为两类地区:扇顶与扇中部、扇缘及以下冲洪积平原区。前者自1999年以来水位明显下降;扇缘及以下地区水位则一般具有明显的呈层性,且浅层和深层的变化特征差别很大。本区水位另一重要特征是不同地点的水位一般会不同,尤其是扇缘以下地区,往往会差别较大。认为产生分区、分层及因地而异这些特征的主要原因是由于粘土类地层的阻隔及地层的沉积压实,尤其是差异性压实,会阻碍地下水的运移,从而使得层间及不同地点间的水力联系变弱。Through the data analysis on the multi-year groundwater level of the monitoring wells, especially for the stratified monitoring wells, the study gives the re-understanding of the variation laws of the groundwater level in Beijing Plain. It is indicated that it can be divided into two categories broadly, the top and middle part of the alluvial-pluvial fan, and the fringe part and outer part of the alluvial-pluvial fan. For the former there is an obvious declining for the water level since 1999. For the parts down in the fringe part of alluvial-pluvial fans, there usually exits the obvious stratification characteristics. Also the variation features of the shallow and deep layers are quite different. For another important feature, the water levels in different points usually are quite different, especially for the areas down in the fringe part of alluvial- pluvial fans. It is pointed that the main reasons for the features of the partition, stratification and variation include the water-blocking effects of the clay-type strata and the compaction effects during the sedimentary process, especially the differential compaction, because they all could block the migration of the groundwater, and lead to the weaker hydraulic connection between the layers and the different locations.

关 键 词：北京平原 分层监测井 地下水位 粘土类地层 呈层性 

分 类 号：P641.12[天文地球—地质矿产勘探]