上海市承压含水层系统应力-应变特征及地面沉降防治对策  

Stress-strain characteristics of the confined aquifer system and land subsidence controlling countermeasures in Shanghai

作　　者：魏子新[1] 杨桂芳[2] 俞俊英[1] 

机构地区：[1]上海市地质调查研究院,上海200072 [2]华东师范大学,上海200062

出　　处：《中国地质灾害与防治学报》2005年第1期5-8,共4页The Chinese Journal of Geological Hazard and Control

基　　金：国土资源大调查项目(199916000112);上海市1 5万综合地质调查资助项目.

摘　　要：1990年以来,上海市地下水开采与人工回灌格局发生了较大的变化。承压含水层地下水位变化与压缩变形均表现为新的特点与发展趋势。通过对上海中心城区含水层系统的应力-应变特点分析,总结了承压含水层随地下水位下降所表现出的弹性-弹塑性-塑性变形的演化规律。上海中心城区第Ⅱ、Ⅲ承压含水层总体上处于地下水开采与人工回灌的平衡状态,表现为弹性变形;而第Ⅳ、Ⅴ承压含水层由于地下水位目前已严重低于其"临界水位",表现为持续压缩的塑性变形。目前,第Ⅳ承压含水层对中心城区地面沉降贡献率已达到了49 3%,西部华漕地区第Ⅴ承压含水层变形的贡献率为46 7%。针对各承压含水层不同的变形特点,提出了地下水资源管理与地面沉降防治对策。Since 1990, some new characteristics and trends of the confined groundwater aquifers for the critical groundwater level and compaction have occurred as a result of the change of groundwater exploitation and artificial injection patterns. By analyzing the stress-strain properties of the confined aquifer system of the Central Shanghai City, the authors discussed the significance of elastic, elastic-plastic and plastic deformations of the confined aquifer system corresponding to the drop of the groundwater level. The result indicated that the 2^(nd) and 3^(rd) confined aquifers were characterized by elastic deformation, showing the balance between groundwater exploitation and artificial injection. In contrast, the 4^(th) and 5^(th) confined aquifers were featured with continuous plastic deformation, revealing the groundwater levels are far below the critical water level. Up to now, the contribution of the 4^(th) confined aquifer to land subsidence has increased to 49.3%, and that of the 5^(th) confined aquifer in western Huacao area has arrived to 46.7%. On the basis of the different deformation characteristics, some management countermeasures are put forward for controlling land subsidence.

关 键 词：地面沉降 承压含水层系统 应力-应变特征 临界水位 上海市 

分 类 号：P642.26[天文地球—工程地质学]