Research On10Coal Seam's Occurrence Characteristics And Block Selection For Comprehensive Mechanization Mining Of Liu Dian Coal Mine

Sedimentary environment is prerequisite of coal seam's occurrence state.It not only directly control the formation and distribution of the coal,but aslo significant effect the coal's thickness,structure and top-floor rock.after the coal is formed. Because of crustal movement and the river flushing action, the primary structure of the coal seam destroyed,that is thickness and structure of the coal seam changed. Because lava erosion action, so that the coal metamorphism for natural focus inlocality.In this paper,we study the occurrence characteristics of10coal seam in Liu Dian coal mine from sedimentary environment and later structure aspects;Use grey fuzzy comprehensive evaluation method to quantitative evaluate10coal seam's structure development level;Use Equi-block indexation method to evaluate10coal seam's geological conditions of Fully Mechanized Mining, the specific methods and the results obtained as follows:1. Use sedimentation and lithofacies ancient geography method to analysis10coal seam's sedimentary environment in Liu Dian coal mine,and come to a conclusion that this area used to be delta plain environment; Using the coal thickness variation coefficient and recoverable index to evaluate the stability of coal seam,and draw a conclusion that10coal seam is stable.2. Thickness of see coal drilling are more uniform. coal seam is stable. through exploration and exploitation comparison.there's a discrepancy in faults's status and distribution at exploration and production two times; Despite the coal seam's thickness of the single see coal point is relatively stable. But as a result of the coal seam under the function of fault cutting, seam is not continuous.3. The faults in mine field are very development. the faults's strike is to the north-east and north-north-east mainly,it's tend to the north-west and north-north-west mainly. More normal faults are exposed through exploration and production, reverse faults rarely. Big faults and small faults intricate, The large-medium-sized faults control subprime small-medium faults; next is the flods development. mine field is a inclined structure whose strike is north-north-west and up to south east, The zone development with some subsidiary anticline and syncline; The influence of magmatic rocks to10coal seam inlocality, caused coal thickness thin and even metamorphic for nature focus mainly; Through the drilling logging curve to interpret coal body structure, come to the conclusion that tectonic coal of10coal seam is very development.4. Use grey fuzzy comprehensive evaluation method and select fault density, fault strength, fractal dimension, planar deformation coefficients and magmatic rock impact intensity index for evaluation index to quantitative evaluate10coal seam's structure development level, and come to the conclusion that10coal seam's structure belongs to complex-extremely complex type.5. Use Equi-block indexation method and select structural index and coal seam index for evaluation index to evaluate10coal seam's geological conditions of Fully Mechanized Mining at western Liu Dian coal mine,come to the conclusion that the condition of Fully Mechanized Mining is bad. Figure [67] table [34] reference [77]...