| The paper is on the basis of my supervisor & Professor Huang Qingxiang's item which is Wang Cun coal mine of Cheng He Mineral Bureau key item. By using the field observation, similitude test, calculation with finite element method and theoretical analysis and so on , the paper thoroughly studied the integral properties of the roof and the relation of support-surrounding in soft-rock. Had consulted forefathers' theory and analyzed about the support under soft-surrounding conditions, the relation mechanism of soft-surrounding at the foundation of the experiments, carry on the similar material simulated test, has known that puts down the destruction sport law which carries the floor exploited gently, act on relation analysis after launching the support-surrounding. Between support and to is it confirm support important link that parameter confirm than sureness that pigeonhole to floor to go on pressing floor, and main parameter, go on confirm and computational analysis to soft-surrounding support working resistance in the form of confirming the rational support. Wang Cun support working range gently and is carried directly by the middle rigidity, the working resistance of the support and sinking amount of the roof are an approximate hyperbolic relation. Wang Cun coal mine put down gently range is from 600kN to 1700kN every support for the working resistance for working range with village, selecting support type as working resistance 2000kN every support reasonable, to the coal seam of the soft-surrounding, will need to strengthen the study on rigidity function of the floor in the future, and propose using and lifting the bottom device. The instance has proved the exactness of the research results.
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