Evaluation of foundation stability in the old goaf of sharply inclined coal seams
To ensure the efficient use of surface land in the goaf,it is of great significance to grasp the current situation of foundation sta-bility in the goaf for later urban planning and to ensure the safety of people's lives and properties.This paper takes the old goaf of a coal mine under the sharply inclined coal seam in Tangshan City as the research object,the geological conditions of the old goaf and the min-ing situation of the coal seam were clarified.Transient electromagnetic method and three-dimensional high-density electrical method de-tection methods were comprehensively adopted,and drilling projects were deployed in key areas for verification.Combined with local practical experience and geological survey results data,the probability integration method was used to calculate the residual deformation of the surface in the study area,and the overall stability of the foundation in the study area was mastered.The results showed that:①there were many residual mining voids in the study area,and their distribution characteristics correlated well with the distribution of coal seam outcrops;②the future surface subsidence deformation in the study area would be mainly residual deformation,the maximum resid-ual subsidence on the surface was 300.68 mm,and the stability of the foundation was unstable-basically stable.Because of the distribu-tion of the goaf and the calculation results of the surface residual deformation,the comprehensive analysis concludes that the stability of the foundation in the study area is poor,and efficient management measures are needed to ensure the subsequent safe use of the land.The research method can provide technical references for the detection and foundation stability evaluation of old goafs in sharply in-clined coal seams.
old goaf of sharply inclined coal seamintegrated physical prospectinggeological drillingprobability integral methodstabil-ity evaluation
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