中国岩溶2017，Vol.36Issue(6)：786-794,9.DOI:10.11932/karst2017y41
岩溶矿床疏干区地下水位恢复对岩溶塌陷作用机制的研究——以湖南宁乡大成桥为例
Study on the mechanism of groundwater level restoration process to karst sinkholes in karst deposit drainage area:A case of Dachengqiao,Ningxiang county,Hu'nan Province
摘要
Abstract
By the end of 2016,17 sinkholes have occurred in Dachengqiao drainage area during groundwater level restoration process.Based on previous research results,through monitoring of groundwater level dy-namic characteristics,hydrogeological and engineering geological drilling and field investigation,this paper studied the characteristics of groundwater restoration and its mechanism on sinkhole formation,which has provided scientific basis for early warning and prevention of ground subsidence in the study area.The results show that,(1)sinkholes are mainly distributed at river terraces and Mazao gully.Sinkholes firstly occurred at recharge area and then runoff area,which has a close relationship with the groundwater dynamic change.(2) The groundwater restoration process can be divided into four stages.The formation mechanisms of the sink-holes can be summarized as the creep seepage and air burst effect,suction effect,soften and suction effect and soften and degradation effect based on these four stages.The collapse patterns are the combination of gravitation-,erosion-,vacuum cavitation-and burst-collapse.It is found that the groundwater level fluctuata-tion in the range of 4-5 m to the surface of bedrock may cause sinkhole more easily.Currently,the ground-water level in the recharge area is 63.95-71.80 m,which is 5-6 m above the bedrock surface,and the groundwater level in the runoff area is 42.8-57.7 m which is 4-17 m below the bedrock surface.There-fore,it is necessary to closely observe the changes of groundwater level.关键词
水位恢复/时空演化规律/岩溶塌陷/作用机制Key words
water-lever restoration/temporal-spatial evolution law/sinkhole/mechanism分类
天文与地球科学引用本文复制引用
潘宗源,蒋小珍,戴建玲,管振德,吴远斌..岩溶矿床疏干区地下水位恢复对岩溶塌陷作用机制的研究——以湖南宁乡大成桥为例[J].中国岩溶,2017,36(6):786-794,9.基金项目
国家自然科学基金项目(41472298) （41472298）
国家青年自然科学基金项目(41402284) （41402284）
中国地质调查项目(DD20160254) （DD20160254）
