Research on engineering stability evaluation of a rail way runs through a goaf based on high density electrical method
In order to reasonably evaluate the stability of a section of Ganzhong Railway crossing goaf,two stages of tech-nical means of macro identification and detailed identification are adopted.In the macro identification stage,the general scope of the goaf and the depth of coal mining are found after site surveying and mapping,engineering geological survey,and collecting the geological report of the coal mine in the goaf.In order to solve the problem that small kiln goaf is challenging to measure efficiently and accurately,based on the field terrain conditions and the general range and burial depth determined at the macro i-dentification stage,the precise distribution range,size,depth,and influence railway range of the goaf are identified first by u-sing the characteristics of ultra-high density electrical geophysical exploration technology,such as high resolution,accurate po-sitioning,economy,and flexibility.Secondly,geological drilling was used to verify the accuracy of the detection results of the ultra-high density electrical method,and the characteristics of the mining zone,mining caving zone,and fracture zone in Goaf were further defined.Based on the technical achievements of the two stages,the stability of goaf is qualitatively evaluated from three aspects:surface deformation characteristics,mining depth ratio(H/M),roof rock and soil mass influence on-site stabili-ty,and the conclusion is that the two goafs are in an unstable state.The QUANTITATIVE calculation shows that the 1#goAF foundation and the 2#GOAF foundation are unstable.Combined with the qualitative and quantitative evaluation results,the comprehensive evaluation results of the two goaf foundation stability are in an unstable state.
railway goafultra high density electrical methodgeological drilling verificationevaluation of stability
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