廊坊城区地面沉降与地下水漏斗响应关系

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。

Study on the response relationship between the groundwater funnel and the land subsidence in the Langfang urban area

By collecting hydrogeological conditions and land subsidence monitoring and other data in the Langfang urban area, groundwater funnel change and land subsidence development are analyzed, and the response relationship between the groundwater funnel and the land subsidence in the Langfang urban area is studied. First of all, deep groundwater is the main source of water in Langfang urban area, water supply quantity shows an overall upward trend in 2001-2015, the production water and household water account for the main part, Groundwater funnel is formed by long-term exploitation of deep groundwater, and the funnel section is V-shaped. Secondly, based on InSAR technology, the subsidence rate of most urban areas in Langfang City is 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 shows that the groundwater funnel basically coincides with the center of land subsidence, the groundwater level exploitation increases. The increase of groundwater level exploitation results in the decrease of deep water level, which leads to the increase of land subsidence rate and the influence scope. The decrease of groundwater level is the main factor affecting the ground subsidence in this area. At the same time, the increase of the architectural complex load also has 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.