Evaluation of Surface Construction Suitability of Old Goaf in a Mine
Aiming at the difficulty of evaluating the suitability of surface construction in old goaf of un-derground mine,this paper comprehensively evaluates the suitability of surface construction in old goaf of underground mine by means of engineering geological exploration,discriminant method of influence depth of building load and empirical formula.The analysis results show that the subsidence backfill with insuffi-cient density is not suitable for construction land,and the residual deformation of other old goaf does not af-fect the safety of new buildings above,and the influence of building load on old goaf should be emphasized.The influence depth of the building and the caving zone height of the goaf area are calculated respectively.When the additional underground stress caused by the building load is equal to 20%of the self-weight stress at the corresponding location,the ratio between the depth and the mining depth of the goaf area after deduc-ing the height of the caving zone can be used as the evaluation criterion for the adaptability of construction land.When the influence depth of the mining depth and the additional stress is greater than 2,the suitabili-ty is good.When it is between 1 and 2,it is the basic suitable area.When it is less than 1,it is the suitabili-ty difference area.The research results provide reference for the evaluation of surface construction in similar goaf areas.
old goafconstruction suitabilitydiscriminant method of influence depthcaving zone
NETL
NSTL
万方数据
