Research and Application of Periodic Weighting Law of Multiple Key Strata in Coal Mining Face
In view of the fact that there are multiple key strata in the fault zone of the coal mining face,it is not in line with the actual law to take the average weighting interval of all supports as the weight-ing interval of the working face.In order to solve the above problems,a research method of periodic weight-ing law of multiple key strata in coal mining face is proposed.Firstly,the'three zones'and key strata of over-lying strata are analyzed.Combined with the monitoring data of mine pressure in working face,the number of support pressure in working face in unit statistical time is taken as the statistical basis,and the date with more support pressure is obtained by algorithm as the date of key strata.This method is used to study the weighting situation of 1201 intelligent mining face.It can be concluded that each weighting of the working face includes the fracture of two key layers.Among them,the average value of the weighting step distance of the first key layer is 17.5 m,the average value of the weighting step distance of the second key layer is 17.9 m,the average difference of the weighting step distance of the two key layers is 0.4 m,and the periodic weighting interval is 11.5 m.By comparing with the field situation,the new calculation method is similar to the field observation results.
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