Study On Hosting Pattern And Influence Of The Seam Exploitation On Water Recourses In The Main Seam Of Yushenfu Deposit

Objective to find out the basic occurrence characteristics and its influencing factors, to guide the coal production and the future construction in the Yushenfu coal mining area, the occurrence characteristics and the change law of floor elevation about 5^-2 coal seam in northern mining area of shaanxi and 2^-2 coal seam in Yushen mining area are researched by means of trends analysis method which based on a large number of borehole (logging) data. The coal seam thickness contour map, coal seam thickness trends map, coal seam thickness residual map, floor counter map, floor elevation change trends map, floor elevation trends residual map are made by the surfer software. The distribution characteristics and influence factors of coal-rich and coal-thin areas are found by finding out global change trends and local abnormal of coal thickness. The developmental law and influence to mine production of faults and folds are researched. The distribution characteristics and thickness change of clay aquifuge be made up of Salawusu (Q_3s) aquifers and Lishi loess (Q_2L) and Hipparion clay (N_2b) which are important to surface eco-environment in Yushen mining area is studied finally. This region is divided into three parts-water preservation, water loss and no-water, by means of comparing the greatest development height of transmissive fissure zones according to the coal seam thickness with the strata thickness change between the impermeable layer and the main coal seam roof, which is to propose countermeasure to water protection mining.This article shows that: 5^-2 coal seam thickness change in northern mining area of shaanxi is east thick, west thin, north and south thick, middle thin, the central of Qian Shipan in most north pinch-out, Shi Getai mine field loss, Hong Liulin in southern mine area and Da Liuta in northern forming two coal-rich area; The global change law of 5^-2 coal seam floor elevation shows east high and west low, and south and north high and central low. This coal seam thickness change has a positive correlation with floor elevation. The global change trend of 2^-2 coal seam in the Yushen coal mining area is southeast thick and northwest thin, Yu Shuwan in southeast angle of the mining area forms a rich coal center. And this coal seam floor elevation shows gradually decreased from east to west. These thickness change characteristics of coal seam are controlled by the ancient basis terrain and the sedimentary structure. There are few faults and fold in northern mining area of shaanxi, but in Yushen mining area, there are no large fault to be found and no magma rush into whole area, and its strata only has width and sustained undulation. So the geologic structure of the front is few complexes than the later, but the structure has little influence to coal mining. The water loss region results from shallow groundwater's lead when transmissive fissure zones of Yu Shuwan and XiWan of the eastern Da Baodang region in YuShen mining area is possibly able to affect to the clay aquiclude; The no-water region results from no distribution of Salawusu aquifers; Other regions is the water preservation, but the necessary measure must be take to guarantee the security in the production process.