基于DFOS的通州湾地区地面沉降监测与变形分析

Land subsidence monitoring and deformation analysis of Tongzhou Bay area based on DFOS

以江苏省通州湾地区YD002钻孔为研究对象,建立了地面沉降DFOS(distributed fiber optic sensing)系统,对该地区第四纪沉积层的变形及地面沉降进行长期监测,并依据监测数据对该地区地面沉降的现状和趋势进行分析。结果表明:该地区目前的主要变形来源为抽水层上部承压含水层组垂向释水造成的土层压缩变形,地层整体呈压缩趋势,且各压缩层变形与地下水水位变化规律密切相关;相较于传统分层标,DFOS技术能够更加精细化地测量土层垂向的压缩-回弹变形。

Taking the YD002 borehole in Tongzhou Bay area of Jiangsu Province as the research object,this paper establishes a DFOS(distributed fiber optic sensing)system of land subsidence to monitor the deformation and subsidence of Quaternary sedimentary layer in this area for a long time.Based on the monitoring data,the current situation and trend of land subsidence in this area are studied and analyzed.The results show that the main deformation source in this area is the compression deformation of the soil layer caused by the vertical water release of the confined aquifer group in the upper part of the main pumping layer.The whole stratum shows a compression trend,and the deformation of each compression layer is closely related to the variation law of groundwater level.Compared with the traditional layer-wise mark,the DFOS technology can more finely measure the vertical compression and rebound deformation of soil layer.