Influence Distance Study of Ground Subsidence Induced By Extracting Groundwater

Many years of research Land subsidence experience has shown that groundwater exploitation is the main reason in Tianjin area. Land subsidence in Tianjin has hidden and the great harm. in particular,to ensure the safety of lifeline engineering,we need to calculate the regional land subsidence caused by groundwater exploitation in the impact of distance,so as to pressure and reducing groundwater mining provide a basis. This paper selected Wuqing district that the route of the Beijing-Tianjin inter-city has through. Using VISUAL MODFLOW groundwater flow simulation software,we have established the exploitation of groundwater flow model. Groundwater flow field is calculation the value of different distances. Ratio unit deformation amount that is land subsidence in a layered statistical is calculated the land subsidence by exploitation ground water. The so-called unit of deformation is more than 1m thick strata,1m drop in water level when the amount of ground deformation caused by the amount of land subsidence.