The Study On The Growth Characteristics And Conductivity Of Karst Collapse Column In Sunan Mining Area

As the shallow resources gradually dry up,the coal mine engineering continuously to the deep mining,the scale unceasingly expands,the stope ground stress and the confined waster pressure of coal floor also increase and the water disasters of coal floor is becoming increasingly prominent.The collapse column is the most dangerous big covered disaster in the coal floor water disaster.There have revealed some collapse columns,so it is very necessary for coal mine safety production to carry out the related probe analysis.In this paper,according to the existing drilling geophysical prospecting exploration data and site construction conditions,to learn the amount,form,revealing way and the water situation by doing statistics.Then analyze the development and distribution characteristics of collapse column and to explore the control factors of collapse column.Analyze the general process of searching and govering collapse column in combination with the collapse column management case of Taoyuan coal mine.The main results:1.There have revealed 8 collapse columns in Sunan coal mine,most plane form of karst collapse column are oval,only one like a circle.Most profile form of collapse column are cone.2.Collapse column in the mining area is divided into two types according to the hydraulic conductivity.The hydraulic conductivity of collapse column have a bearing on the cementation and compaction degree of the fillings inside the cylinder and the caving height of collapse column.The caving height of water flowing collapse column is higher and the mud stone class content is higher and have a variety of ingredients in internal fillings.3.The distribution of collapse column is similar to karst development in Sunan mining area,has the inhomogeneity and controlled by structure,terrain and groundwater.Major developed in the tectonic stress concentrated,low-lying terrain and groundwater runoff area.Structure is the main controlling factor.The collapse column distributed in groups and zonality in the tectonic stress area.And the long axis direction of most collapse column is almost the same with the tectonic line direction.4.Take the No.3 collapse column governance project cases of Taoyuan as an example.Summarized the general management steps of collapse column.Used geophysical exploration methods to delineated the abnormal area before production.Finding out the parameters of collapse column development such as the boundary,height,shape and so on,determined the hydraulic conductivity.For the specific circumstances in the late,used the engineering governance means such as grouting reconstruction and coal pillar preserved to ensure the safety of coal mining.