Mine Pressure Rule Of Basic Roof In Deep Mining

Coal is one of the main energy in China. In recent years, our country has entered the deepmining, deep coal rock characteristics research more thorough, but the influence of its specialmechanical properties to the deep stopes mining has not solved. No matter frequency or thedeath toll, the proportion of the roof disaster accident is high in five nature disaster in coalmine.And the basic roof to pressure is the key work of roof management, also say, is the maincontradiction. But at present, step distance of the basic roof to pressure most use the planeproblem of beams to calculate, what is often Differ Very Big with reality. First, on the basis ofcoal seam impact tendentiousness test have done before to complete Deep stopes similar materialsimulation test. Then establish basic roof mechanics simplified model of deep stopesgoaf.Finally establish deep stope collapse of the basic roof falls numerical model and analyzingdifferent mining depth on the basic roof pressure of the influence of the distance. Theunderstanding and the results obtained mainly as follows:(1)To Henan pingdingshan deep stopes mine area, using the basic principle of similarmaterial simulation test, select Uniform loading method in the upper part of model and completedeep coal seam mining upper strata of indoor spatio-temporal evolution model test. Test resultsshow that the basic roof collapse rule significant, the step distance of the first and periodicpressure is short; In the process of mining the pressure of the basic roof support is dynamicchanging; the Mining influence to the abutment pressure of Overlying strata above the coal seamdecreases gradually as far away from coal seam. The result provides necessary test data andreliable theory basis for establishing numerical simulation of the pressure from basic roof in deepstopes goaf and deep mining.(2)For the actual mining face in deep stopes, the high stress state rock nonlinear unifiedstrength criterion is introduced. The mathematical model of the basic roof in deep stopes goaffirst break is established. Get the expression of the limit loading of the first pressure from thebasic roof and the step distance. The expression is introduced to Wu9-10-20180mining face ofpingdingshan shi kuang. The correctness of the results is verified.(3)The background is deep stopes in Pingdingshan mine area of Henan, rock cracknumerical simulation approach is set up based on extension finite element method. The crackproduce process in the basic roof is modeled by large extension nonlinear finite element method.By means of the comparison between the test results and the simplified theory model results, getthe law of the first pressure from the basic roof in deep stopes goaf. The pressure step distance decreases and strength increases as the increase of mining depth.The mining mechanism of deep stopes is discussed in these results. These results provide areliable thought that the law of pressure from the basic roof based on deep coal rock massstrength criterion in deep stopes goaf, and provide reference and technical support forestablishing theory and numerical model of the law pressure from the basic roof in deep stopesgoaf. These results are provided with important theoretical and practical meaning to the disasterof deep stopes roof pressure.