The Research Of Surface Movement Law On The Stepwise Mining Deep

Energy is base on the development and progress of human society , and coal is the main energy in our country , meanwhile the speed and scale of energy industry development is the indemnity of the economic health and sustainable about our country . Along with the exploitation of coal resource extends to the deep in china , the sloping direction of working face is easy to form super-subcritical extraction . In order to more effective exploit and use the limited coal resource , in this article , under the existing conditions , based on the mining subsidence of the super-subcritical extraction , and discussed the calculation method about the width of mining and staying in the step mining , and inquire into the calculation method of the shortest time interval in the stepwise mining . The prediction parameters of surface movement and deformation are obtained by using computer simulation based on actual data.The surface movement and deformation of single super-subcritical extraction is used to produce predictive parameters , which is required by the probability function . Taking use of law of probability integral make an expected about this regional , comparing with the intending result of mining all the coals in one time by the method of probability integral , mining the coals in different stages can ease the breakage to structures on the ground . Combine influence factor with dominant stratum theory , the rock up swelling and puking of the wall rock and so on , to find out the causes of the initial damage caused by stepwise mining . It is very reality significant for guiding the stepwise mining technology applied to the geological mining .