Spatiotemporal coupling law of mining pressure, strata movement and fracture field distribution in deep stope

With three typical deep mine working faces of Huainan mining area as research background, the dynamic evolutionary characteristics and spatiotemporal coupling effect of mining pressure, strata movement and fracture distribution in deep stope have been studied by using the comprehensive methods composed of numerical simulation, similar simulation and field monitoring. Furthermore, the dynamic response mechanism of mining stress field, overlying strata displacement field and roof fracture field has also been investigated. The results have shown that mining stress is significantly affected by mining progress, and the range within 20 m before and after working face squaring is the significantly affected zone of stress, with the dynamic response of the transient evolution features between mining stress and progress. Strata movement has strong spatial-temporal view, the same layer of strata with the speed increasing vertical displacement into a "Z" shaped distribution. Roof fracture range of plastic zone and mining advance progress keep synchronous coordination, and expansion space changes from lower to upper, damage depth from outside to inside, and affecting time from short to long. Roof breaking has spatial and temporal characteristics of transient, piecewise extension and partition mobility, strata fracture field has experienced spatial and temporal evolution process of pressure relief and instability losing, extensional cracking, fracture shrinking and turning small, fitting and closing. Mining response mode of advancing time and overburden failure has been obtained by field monitoring, and research results have provided a theoretical reference for the prevention of deep rock dynamic disasters. © 2016, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.