Internal thermal origin mechanism of Karstic collapse column with no smoothly extrinsic cycle

摘要

Huainan coal field as main object,investigation of Karstic hydrogeological con- ditions were developed in Huainan structureal unit,and the basic conditions,features and rules of Karstic growth were summarized.Geology background and causes of Karstic col- lapse columns were analyzed.Combined with ancient physiognomy,environment and li- tho-facies features.After studying synthetically Karstic collapse columns,shape of col- lapse body,filling feature,hydrodynamic condition and agglutinate material in Huainan area,considering mine hydrogeological conditions of Xuhuai coal field and referenced Karstic collapse columns characters of other mines in North China,the internal thermal origin theory is elementarily formed for Karstic collapse columns extrinsic cycle can not operate smoothly.Finaly,three aspects including distributing features of different kinds of Karstic collapse columns in north China type coal field,conditions of Karstic collapse col- umns origined from internal thermal with no smoothly extrinsic cycle,mechanics of causes were analyzed and demonstrated.