常州横林岩溶塌陷区地下水水动力模式及致塌作用研究  

Study on groundwater hydrodynamic model and its collapse effect in karst collapse area of Henglin,Changzhou

作　　者：车增光 喻永祥[1] 刘洪[1] CHE Zeng-guang;YU Yong-xiang;LIU Hong(Key Laboratory of Fracture Geological Hazards,Ministry of Land and Resources/Geological Survey of Jiangsu Province,Nanjing 210018,China)

机构地区：[1]国土资源部地裂缝地质灾害重点实验室/江苏省地质调查研究院,中国南京210018

出　　处：《地下水》2020年第6期43-46,共4页Ground water

基　　金：苏南地区岩溶地质生态环境调查评价(苏财建[2014]278号)。

摘　　要：常州横林岩溶塌陷始发于20世纪80年代末,是我国长三角地区最典型的平原深覆盖型塌陷之一,地下水活动是塌陷形成的主导性动力因素。从含水层结构及分布、水位动态变化等方面,分析了横林地区地下水系统特征及历史演变过程,结果表明:基岩潜山式基底构造、“天窗式”砂层—灰岩含水层结构以及主采层水位的持续下降,造成地下水水动力模式的不断演变,依据水位与基岩面的关系,将塌陷期内的地下水水动力条件概化为承压、承压—负压、负压3种模式,岩溶塌陷的发生、发展与承压—负压、负压两种模式的形成基本具有同步性,地下水的渗流潜蚀、失托加荷和真空吸蚀是岩溶塌陷产生的主要致塌作用。The karst collapse of Henglin Prefecture of Changzhou City,which originated in the late 1980s is one of the most typical deep-covered collapses in the Yangtze River Delta of China.The dominant dynamic factor for the formation of karst collapse is groundwater activity.In this paper,we analyze the characteristics and historical evolution of groundwater system in Henglin area based on the structure and distribution of aquifer and the dynamic change of water level.The research shows that the bedrock buried hill type basement structure,the"skylight"sand layer-limestone aquifer structure and the continuous decline of the water level of the main mining layer have caused the continuous evolution of the groundwater hydrodynamic model.Based on the relationship between the water level and the bedrock surface,the hydrodynamic conditions during the collapse period can be generalized into three modes:pressure,pressure-negative pressure,and negative pressure.The occurrence and development of karst collapse synchronizes basically with the two modes of pressure-negative pressure and negative pressure.Groundwater seepage latent erosion,vacuum erosion and unloading are the main causes of karst collapse.

关 键 词：岩溶塌陷 地下水活动 水动力模式 致塌作用 常州 横林 

分 类 号：P641.2[天文地球—地质矿产勘探]