Study On Dynamic Response Of Fushun West Open Pit Mine Slope In Remaining Coal Mining Period

After mining for near sixty years, Fu Shun west open-pit mine come to remaining coal mining period. Fu Shun west open-pit mine have formed an 400 miles depth pit, In the pit, different kinds of geologic structures like big or small fault, fold, weak layer and so on, along with rocks formed by depositing in different time, containing argillaceous composition, in the mean time, underground mining formed various caves, goaf. Because of the depth of west open-pit mine is large, the horizontal stresses in sides and rocks at bottom decrease or fade away, and that lead to the difference between the vertical and the horizontal stresses increase. Hun river ponds for years, cause continuous water leakage out of west open-pit mine north side. Specially the mines of Long Feng, Sheng Li and Tiger mine have broken out high frequency, more serious earthquakes, the focus is shallow, forming an environment with cyclical loading on rock tired and base shake.The thesis adopt the study method combines optical test, theory analysis with numerical simulation, acquired the following main achievements:(1) the dynamical characteristic trial on rocks specimen under dynamical loading, reveal the rmation, wreck characteristic of rocks under long time cyclical dynamical loading. The upper limit stress , periodic loading amplitude, loading frequency, wave form in a fatigue test all have influence on rocks tired process; when the upper limit stress is equal, the bigger the amplitude is, the more easy to damage; Both the upper limit and amplitude have a critical value, cyclical loading must excess this value, or loading will not oscillate causing deformation, and cannot form tired damage; The high the cyclical loading frequency is, the more easy to damage; Rocks specimen fatigue fracture curve is controlled by static loading curve, and a kind of rock fatigue fracture stress-strain curve must be within the same kind of rock static loading...