Chen Bei-Bei, Gong Hui-Li, Li Xiao-Juan, Lei Kun-Chao, Lin Zhu, Wang Yan-Bing
State Key Laboratory of Urban Environmental Process and Digital Modeling, Capital Normal University, Beijing 100048, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2013 Aug;33(8):2198-202.
The excessive mining for underground water is the main reason inducing the land subsidence in Beijing, while, increasing of load brought by the urban construction aggravate the local land subsidence in a certain degree. As an international metropolis, the problems of land subsidence that caused by urban construction are becoming increasingly highlights, so revealing the relationship between regional load increase and the response of land subsidence also becomes one of the key problems in the land subsidence research field. In order to analyze the relationship between the load changes in construction and the land subsidence quantitatively, the present study selected the TM remote sensing image covering Beijing plain and used Erdas Modeler tool to invert the index based on building site (IBI), acquired the spatial and temporal change information in research area further; Based on results monitored by PS-InSAR (permanent scatterer interferometry) and IBI index method, and combined with the GIS spatial analysis method in the view of pixels in different scales, this paper analyzes the correlation between typical area load change and land subsidence, The conclusions show that there is a positive correlation between the density of load and the homogeneity of subsidence, especially in area which has a high sedimentation rate. Owing to such characteristics as the complexity and hysteretic nature of soil and geological structure, it is not obvious that the land subsidence caused by the increase of load in a short period. But with the increasing of local land load made by high density buildings and additional settlement of each monomer building superposed with each other, regional land subsidence is still a question that cannot be ignored and needs long-term systematic research and discussion.
过量开采地下水是诱发北京地面沉降的主要原因，而城市建设带来的荷载增加在一定程度上加剧了局部地面沉降。作为国际大都市，城市建设引发的地面沉降问题日益凸显，因此揭示区域荷载增加与地面沉降响应之间的关系也成为地面沉降研究领域的关键问题之一。为定量分析建设中的荷载变化与地面沉降之间的关系，本研究选取覆盖北京平原的TM遥感影像，利用Erdas Modeler工具反演基于建筑用地的指数（IBI），进一步获取研究区域的时空变化信息；基于永久散射体干涉测量（PS-InSAR）监测结果和IBI指数法，并结合不同尺度像元视角下的GIS空间分析方法，分析典型区域荷载变化与地面沉降的相关性，研究结果表明荷载密度与沉降均匀性之间存在正相关关系，尤其是在沉降速率较高的区域。由于土壤和地质结构的复杂性及滞后性等特点，短期内荷载增加引起的地面沉降并不明显。但随着高密度建筑造成的局部土地荷载增加以及各单体建筑附加沉降相互叠加，区域地面沉降仍是一个不可忽视的问题，需要长期系统的研究和探讨。
