Study On The Evaluation Of Surface Residual Deformation And Stability In A Goaf Of Yi Yuan Kou

The disasters caused by the goaf can not be ignored,such as the collapse of buildings,the destruction of roads,and the intensification of ground cracks.But the goaf has the characteristics of irregular spatial distribution,strong concealment and hard to predict the ground collapse.It has always been a difficult problem for engineers and technicians to pay great attention to;the analysis of the surface residual deformation and stability in a goaf is a hot issue in the study.In this paper,the research work is carried out on the background of the goaf in Yiyuankou village.Using the deformation mechanism of the key layer structure and the theory of elastic thick plate,the calculation model of the surface residual settlement was derived.The rock thickness,modulus of elasticity and action load have a significant influence on the surface residual settlement,but the effect of Poisson's ratio is not very much.The establishment of the model provides a theoretical guidance for the overall grasp of the surface residual deformation law in the goaf.Based on the deformation monitoring data of the goaf,and using the GM(1,1)model of grey prediction theory,the deformation prediction equation of several regions was constructed,and the prediction for the development trend of the surface residual deformation was made.The results show that the stability of the goaf still has a great potential for safety,and it is necessary to use the grouting method and other treatment measures to deal with it.With the aid of the finite difference software FLAC,the engineering generalizability models of the goaf before and after using the grouting method were established.The stability criterion of foundation was put forward,and the stability of the goaf before and after treatment was compared.Through the calculation and analysis of the failure field and deformation field of foundation,prove that grouting treatment is very effective,which effectively controls the occurrence of plastic zone development and surface residual deformation.The numerical simulation technology provides an effective solution to the evaluation of the effect of the grouting treatment in the goaf...