Research On Mining Subsidence Laws Of Thin Bedrock And Shallow Buried Depth

The rule to strata and surface deformation shows the specialty which under thin bedrockand shallow buried depth mining conditions,only master the mechanism that can guide miningactivities effectively in the similar geological conditions.Theory research,curve fitting,numerical simulation is applied in this dissertation for theresearch of SanDaoGou coal mining.This thesis makes a comparatively systematic researchon structural stability,mechanical mechanism,predicting parameters and the rule of strata andsurface deformation.The main conclusions of this thesis contain the followingaspects:Firstly,the mechanism of strata and surface movement under thin bedrock and shallowburied depth mining conditions are highlighted,which by the integrated study of mechanicalmechanism.Secondly,based on analyzing influencing factor under the geologicalconditions,relationship between parameters and the ratio of depth and thickness,the ratio ofbedrock thickness and loose layer thickness are established.Thirdly,a theoretical analysis wascarried out for the strata and surface deformation characteristics which based on geologicaland surveying data in SanDaoGou mine,Meanwhile,all kinds of surface deformationparameters are obtained,too.Fourthly,predicting parameters are calculated by curve fittingmethod,and point out the probability integral method is expected to surface deformation in thestudy of feasibility.Fifthly,by use FLAC3D.the effect of underground minging on the surfacemovement are revealed,and the relationship between parameters and the depth and thicknessare established.