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1991~1996年期间,上海中心城区年均沉降达10.2mm,约为前25年的2.5倍。外加海平面上升与上海地壳下沉,上海近期沉降加速形势引起了新闻媒介和市政府的高度重视。本文概述了上海近期地面沉降的面上和垂向分布特征。指出上海近期地面沉降加速是在浅部土层保持持续性压缩的基础上,第Ⅱ、Ⅲ含水层水位上升速率大大降低,第Ⅳ、Ⅴ含水层开采量大幅增加而地下水位下降速率加大及建筑工程大面积施工等多种因素所产生的。提出的对策建议有:加强城市建设和工程施工的地面沉降监督管理;开展对浅部土层沉降机理研究;保持第Ⅱ、Ⅲ含水层的地下水回灌,严格限制开采量;逐年缩减第Ⅳ、Ⅴ含水层地下水开采量,使其向居民饮用水方向发展;实行长江三角洲地下水统一管理。
From 1991 to 1996, the average annual urban subsidence in downtown Shanghai reached 10.2 mm, about 2.5 times that of the previous 25 years. Coupled with the rising sea level and the descending of Shanghai’s crust, the recent acceleration of settlement in Shanghai has caused great attention from the news media and the municipal government. This article provides an overview of the surface and vertical distribution of recent land subsidence in Shanghai. It is pointed out that the recent acceleration of ground subsidence in Shanghai is based on the sustained compression of the shallow soil layers. The water level rise rates of the II and III aquifer are greatly reduced. The production of the IV and V aquifer drastically increases while the descending rate of the groundwater table increases Construction of a large area of construction and other factors arising. Proposed countermeasures and suggestions are as follows: To strengthen supervision and management of land subsidence in urban construction and construction; To study the mechanism of subsidence in shallow soil; To maintain the recharge of groundwater in the aquifers in sections II and III, and to strictly limit the amount of exploitation; To reduce Ⅳ, Ⅴ Aquifer groundwater exploitation, to the direction of residents drinking water; the implementation of the Yangtze River Delta groundwater management.