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分布式光纤监测是利用光纤作为传感介质,采用先进的OTDR技术,探测出沿光纤不同位置土层的应变情况,实现真正分布式测量。阜阳地面沉降是由于过量抽汲阜阳城区地下水引起水位下降,在正常固结和超固结[1]土层分布区,由土层固结压密而造成的大面积地面下沉现象。省地质测绘院、阜阳市测绘院、安徽省地质调查研究院在该区域进行大量的高程测量工作,仅查明了地面沉降范围及垂直沉降量,但对地面沉降的形成机理,各压缩层的变化量缺少统一认识。采用分布式光纤监测技术能准确测出各压缩层的变化关系,为阜阳地面沉降防治研究提供科学依据。
Distributed optical fiber monitoring is the use of optical fiber as the sensing medium, the use of advanced OTDR technology to detect the strain along the optical fiber at different locations in the soil to achieve truly distributed measurements. The land subsidence in Fuyang is caused by the excessive pumping of groundwater in Fuyang urban area, which leads to large surface subsidence caused by the compaction of soil layers in the normal consolidation and overconsolidation [1] soil distribution areas. Provincial Geological Surveying and Mapping Institute, Fuyang City Surveying and Mapping Institute, Anhui Institute of Geological Survey in the region a large number of elevation measurements, only to identify the scope of the land subsidence and vertical settlement, but the formation mechanism of land subsidence, the compression layer Changes in the lack of a unified understanding. Using distributed optical fiber monitoring technology can accurately measure the change of the compression layer, providing a scientific basis for the prevention and control of land subsidence in Fuyang.