| Through analyzing the commodity of '.Д.Слесарев formula by the softwareABAQUS, this essay try to study the regular pattern of stress and strain distribution of rockmass near coal mining stope under different fault line. Main content:1. The formula is based on the mode of simply supported beam and the principle thatthe maximization tensile stress should be less than the tensile strength of the coal bed. Theformula derivated from the mode of statically indeterminate beam meet a more criterionroof-to-floor fixed support condition. Through numerical simulation, we found that themode of simply supported beam and statically indeterminate beam is only applicable to thecondition that the width of pillar is far less than the thickness of coal seam. To the actualbarrier pillar, the mode is far distorted.2. Based on the geological background and character of aquifer and fault of the Xuhuaiarea, generalized the modeling parameters and established the numerical model. Thoughanalyzing the regular pattern of stress and strain distribution of mined-out area, it is foundthat the barrier pillar all turned to be longitudinal compressed under any kind of conditionwithout the appearance of longitudinal compression to the simply supported beam. Thestress-strain of barrier pillar often turns to the maximization when the fault degree isbetween about90-110°. Overthrust fault can easily deform stretching and activate to bewater conductive fault.3. Discussed the geometrical condition that the formula should be satisfied, pointedthat during the actual coal-mining which is near faults, the geometrical conditions, Stress conditions and “stress-thickness” conditions of the coal pillar are all contrary to thecharacters of the formula.4. According to the numerical simulation results, deduced the tensive, extensive andcompressive deformation may be the basic reason of water inrush triggered by coal miningnear faults. |
PDF Full Text Request