上海国土资源Issue(4)：12-16,5.DOI:10.3969/j.issn.2095-1329.2014.04.003
上海地区地面沉降新特征的发生机制分析
Investigation of the mechanism associated with recent land subsidence in Shanghai
摘要
Abstract
Recent land subsidence in Shanghai has fol owed a new pattern whereby the subsidence and deformation of the aquifer increase continuously, but the deformation lags the recovery in the groundwater level. Existing approaches to land subsidence prediction cannot reasonably interpret these phenomena. Consequently, new research was conducted to investigate the mechanisms associated with the new phenomena of land subsidence in Shanghai:i) the inlfuence of urban construction on increased land subsidence was investigated;and i ) the creep characteristics of sandy soil were analyzed to investigate the causes of increased aquifer deformation. This research explains the new phenomena of land subsidence to a certain degree, but could not identify the mechanism. The authors proposed two approaches to try and identify the load-transferring mechanism by considering the temporal and spatial redistribution of stress due to the withdrawal of groundwater. Firstly, a land subsidence model was established based on the Cosserat continuum mechanism. This model considers shear forces on an aquifer caused by groundwater pumping and hydraulic gradients. Secondly, the internal erosion of ifne particles in the aquifer, which leads to the redistribution of land subsidence in both space and time, was considered. Such land subsidence due to the internal erosion of ifne silty and clay particles in the pores of aquifer should be investigated.关键词
地面沉降/含水层变形/城市建设/Cosserat力学体系/细颗粒流失Key words
land subsidence/deformation of aquifer/urban construction/Cosserat continuum mechanism/internal erosion of ifne particles分类
天文与地球科学引用本文复制引用
沈水龙,许烨霜..上海地区地面沉降新特征的发生机制分析[J].上海国土资源,2014,(4):12-16,5.基金项目
国家自然科学基金项目(41102175) （41102175）
