Land Subsidence Induced by Groundwater Extraction and Building Damage Level Assessment——A case Study of Datun, China
As in many parts of the world, long-term excessive pumpage of groundwater has caused significant land-surface subsidence in the residential areas of Datun coal mining district in Eastern China. The recorded maximum level of subsidence in the area since 1976 is 863 mm, and the area with an accumulative subsidence greater than 200 mm has reached 33.1 km2 by the end of 2006. Over ten cases of building crack due to ground subsidence have already been observed. Spatial variation in ground subsidence often leads to a corresponding pattern of ground deformation.Buildings and underground infrastructures have been under a higher risk of damage in locations with greater differential ground deformation. Governmental guideline in China classifies building damages into four different levels, based on the observable measures such as the width of wall crack, the degree of door and window deformation, the degree of wall inclination, and the degree of structural destruction. Building damage level (BDL) is estimated by means of ground deformation analysis in terms of variations in slope gradient and curvature. Ground deformation analysis in terms of variations in slope gradient has shown that the areas of BDL Ⅲ and BDL Ⅱ sites account for about 0.013 km2 and 0.284 km2 respectively in 2006, and the predicted areas of BDL (define this first) Ⅲ and Ⅱ sites will be about 0.029 km2 and 0.423 km2 respectively by 2010. The situation is getting worse as subsidence continues. This calls for effective strategies for subsidence mitigation and damage reduction, in terms of sustainable groundwater extraction, enhanced monitoring and the establishment of early warning systems.
Land subsidence groundwater extraction ground deformation slope gradient building damage level Datun China
FENG Qi-yan LIU Gang-jun MENG Lei FU Er-jiang ZHANG Hai-rong ZHANG Ke-fei
China University of Mining and Technology Xuzhou 221008, China Royal Melbourne Institute of Technology University, Melbourne, 3001,Australia
国际会议
徐州
英文
48-52
2007-10-22（万方平台首次上网日期，不代表论文的发表时间）