Study On The Law Of Regional Mine Pressure Appearance Based On The Concept Of "Regional Big Support"

Based on the analysis and statistics of mine pressure in Shangwan Coal Mine,buertai coal mine and Daliuta coal mine in Shendong mining area,it is found that the distribution of the working resistance of the support along the inclined(face length direction)is uneven,which has a strong regional character.In this regard,based on the concept of "regional big support",the division law of the first and one side goaf working faces along the inclined area is summed up by the method of field measurement;the roof movement law along the inclined area and the distribution of each area are studied by using the method of theoretical analysis and mechanical calculation,and the roof structure model along the inclined area is established;according to the divided area,the roof structure model along the inclined area is established Study on the law of regional mine pressure appearance and put forward corresponding control measures.The specific results are as follows:1)According to the trend of the working face,the stress of each support is not uniform,and it shows the basic characteristics of "low pressure-pressurization-high pressure-pressurization-low pressure" from the beginning of the end position.It can be divided into "low pressure area 1","pressurization area 1","high pressure area","pressurization area 2" and "low pressure area 2" along the trend.The distribution range of each area of the first mining face is "trapezoid with symmetrical center" The distribution range of each area of the working face in one side of the goaf is characterized by "trapezoid with asymmetric center".2)In the same working face,the characteristics of the mineral pressure in different areas are different,and the difference with the whole working face is large;in the same working face,the regional end resistance and bracket utilization ratio are the highest in the high pressure area,the highest in the high pressure area and the lowest in the low pressure area;in the same working face,the dynamic load coefficient is the obvious in the high pressure area,the obvious in the high pressure area and the low in the high pressure area The pressure zone is not obvious.3)According to the situation of regional mine pressure,the control measures such as partition support,forced caving and reasonable support selection are put forward.