廊坊城区地面沉降与地下水漏斗响应关系

Study on the Response Relationship between the Groundwater Funnel and the Land Subsidence in Langfang Urban Area

通过收集廊坊城区水文地质条件、地面沉降监测等资料,分析地下水漏斗变化和地面沉降发展情况,研究廊坊城区地面沉降与地下水漏斗响应关系。首先,深层地下水是廊坊城区的主要水源,2001—2015年供水量呈整体上升趋势,其中生产用水和家庭用水占主要部分,长期开采深层地下水形成地下水漏斗,漏斗断面呈“V”字形。其次,基于合成孔径雷达干涉(interferometric synthetic aperture radar,InSAR)技术,廊坊市城区大部沉降速率>60 mm/a,局部达80 mm/a。再者,地下水漏斗变化和地面沉降响应关系显示,地下水漏斗与地面沉降中心基本吻合,地下水位开采量增加,造成深层水位下降,导致地面沉降速率不断变大,影响范围亦增大,地下水位下降成为该区地面层沉降主要影响因素,同时建筑群荷载增加对地面沉降亦产生不利影响。因此,开展地面沉降与地下水漏斗响应关系研究可为地面沉降灾害防治提供理论依据。

By collecting hydrogeological conditions and land subsidence monitoring and other data in Langfang urban area,groundwater funnel change and land subsidence development were analyzed.The response relationship between the groundwater funnel and the land subsidence in Langfang urban area was studied.First of all,deep groundwater,the main source of water in Langfang urban area,was of an overall upward trend of its supply quantity in 2001—2015.Among which,the production water and household water accounted for the main part.Groundwater funnel was formed by long-term exploitation of deep groundwater,and the funnel section was V-shaped.Secondly,by interferometric synthetic aperture radar(InSAR)technology,the subsidence rate of most urban areas in Langfang was more than 60 mm/a,and locally up to 80 mm/a.Moreover,the response relationship between the change of groundwater funnel and the land subsidence showed that the groundwater funnel basically coincided with the center of land subsidence,the groundwater level exploitation increased.The increase of groundwater level exploitation resulted in the decrease of deep water level,which led to the increase of land subsidence rate and the influence scope.The decrease of groundwater level was the main factor affecting the ground subsidence in this area.At the same time,the increase of the architectural complex load also had a negative impact on the ground subsidence.Therefore,the study on the response relationship between land subsidence and the groundwater funnel provides a theoretical basis for the prevention and control of land subsidence disasters.