Practice And Analysis Of Comprehensive Testing For Deformation And Failure Of Overburden In Stope

Although China vigorously promotes the development and utilization of new green energy,the most important primary energy source is still coal.As coal mining continues to dig deeper,various geological disasters continue to occur in the deep coal mines.Among them,mine water damage accidents occupy a large proportion,and overburden deformation and damage is an important factor causing roof water damage accidents.In this paper,the comprehensive deformation test is used to study the deformation and failure characteristics of overburden,so as to determine the water-cracking zone and the development height of the fault zone,and provide technical guidance for the prevention and control of roof water damage.The on-site test relies on the 1312(1)working face of a mine in Huainan.Based on the mining geological conditions,the coal seam roof drilling is used for monitoring construction,and the distributed optical fiber and parallel electric method integrated detection system is constructed to test the deformation and failure process of the mining overburden.the study.Through the data analysis,the variation characteristics of the roof rock strata during the mining process are obtained,and the development height of the “two belts” of the roof rock stratum is inferred.Among them,the resistivity test results show that the development height of the slump zone is 15 m,and the development height of the water-conducting fracture zone is 38 m.The distributed fiber test results show that the development height of the fault zone is 16 m and the development height of the water-conducting fracture zone is 40 m.Based on the comprehensive analysis of the measured results,it is judged that the development height of the 11-2 coal water-conducting fracture zone is 40 m,the development height of the fall zone is 16 m,and the average coal thickness of the working face is 2.8m,the slump/thickness ratio is 5.7 times,crack/mining The thickness ratio is 14.8 times.In this paper,the combination of electrical exploration and distributed optical fiber exploration technology is applied to the deformation and failure of overburden in the stope.It is of great practical significance to test and analyze the deformation and failure process.The test results obtained from the study can provide technical parameters for the mining of the surface and similar working faces to prevent mine disasters such as water inrush accidents.Affected by the deformation and damage of the roof rock stratum,the test cable and cable selection should be studied in combination with the characteristics of the stratum to achieve a comprehensive observation of the data.Due to the current technical means,the research results of this data collection are not guaranteed to be completely consistent with the actual situation.At the same time,the technical means should be further studied and improved to reduce the influence of errors and improve the detection accuracy.Figure [29] Table [4] Reference [79]...