Research On The Effect Of Syncline Structure On Rock Burst In Wudong Coal Mine

There are totally 32 coal-bearing layer in Wudong mine field,the primary mineable coal bed now is the two coal seam B1+2 and B3+6,whose thicknesses is respectively 30 m and 40 m,the average angle of the coal seam is 87°,is steeply inclined and specially thick coal seams mining.The mine adopts inclined shaft multiple levels for development and horizontal section top coal caving process for extraction.Since 2011,there have been five times rock burst accidents in ming working face of Wudong mine,which caused serious threat to the safety production of mine.The steeply inclined seam is in the south wing of Ba Daowan syncline,with the excavation engineering extends to the deep,the further performance of the coal and rock is stress concentration and energy accumulation,the danger of rock bursts occurrence will be further strengthened,it has become a major issue to be solved in current safety production in Wudong Mine.The paper,taking the Ba Daowan syncline structure as the research background,completes the following studies.Statistical analysis rock burst pressure behavior in the syncline structure areas,clears appearance characteristics of rock burst in structural areas;Determination of the physical and mechanical properties and bump proneness of coal seam in syncline area has obtained by laboratory test;Methods of theoretical analysis and analogical reasoning,etc are integrated to analyze the forms of Ba Daowan syncline structure,by what the scope of the synclme axis section is detenmined,than,studied the distribution characteristic of principal stress of the scope;Tectonic stress conditions of rock burst pressure behavior in Wudong Mine and the impact on stability ot drivage roadway caused by bending rock are analyzed in theory;The mining scheme and comparison scheme are researched by using numerical simulation method,the influence of mining stress is analyzed as well,moreover,Ultimately determine the preferred embodiment of the seam mining suitable for syncline wings,But also provide theoretical basis for the design of mine bumping prevention and control scheme.The research results show that:Coal seam in Wudong Mine has weak bump proneness,and the Ba Daowan syncline is a Fault-bend fold;Coal and rock below the level+225 m of the Ba Daowan syncline is closed to influence scope of the syncline axis section,primary stress reaches a higher level in this scope,and horizontal principal stress value is about 2.5 times of vertical principal stress,which reflects the characteristic that tectonic stress concentration in the syncline axis;It determines that mining B1+2 coal seam before B3+6 coal seam is a better solution,the face advance support stress influence ranges 40 m-65 m in the syncline wings,the peak stress ranges from 8.8 MPa to 8.8 MPa,the face lateral support stress influence ranges 15m?20n,It provides theoretical basis for the design of mine pressure bump prevention and control scheme,It is also instructive for prevention and control of rock bursts of the similar syncline area.