Research On Grouting Effect Detection Of New Railway Dongdu To Pingyi Foundation Goaf

Goaf is the surface deformation and damage district or area that the region of space left by underground ore body being mined and then its surrounding rock instability and displacement、cracking、crushing even breaking down until the overlying rock mass sinking、 bending as a whole.In China goaf is widely distributed especially the large number of coal mine goaf has caused a serious impact on surface buildings or railway etc.Currently China’s railway construction is at its peak,coal mine goaf has become increasingly serious as the geological disaster problem in the construction of railway engineering,and using economical and rational methods governance goaf to reduce its harmfulness is imminent.The domestic large complex goaf mainly use grouting filling for processing, but grouting is by drilling in the underground rock and the goaf filling effect or broken rock consolidation effect of slurry can’t be directly observed,so the goaf grouting effect detection methods become a key technology in the goaf governance.This article selects new railway Dongdu-Pingyi foundation goaf as the research object, this goaf with characteristics such as large-scale multi-layered、no law of mining、hydro geological and engineering geological conditions are complicated、and mining data is incomplete etc.By the means of survey report and site investigation have a comprehensive understanding of the engineering geological conditions of goaf such as topography、lithology geological structure etc. Identified the general characteristics of the goaf、distribution of coal seams and analysis of the law and existing characteristics of the deformation of the goaf. Through study of the various geophysical methods’principle and compare its applicability in this project selected electrical sounding、the seismic waves CT and the electromagnetic wave CT integrated geophysical method combination of drilling as detection methods of the goaf grouting effect.By the interpretation and analysis of the geophysical testing data and combined with drill core、the results of drilling grouting verify t figure out that the overall grouting effect of detection segment is good, able to meet the requirements of the goaf roof rock stability.The successful application of integrated geophysical combined drilling to verify the grouting effect detection of this goaf provides a theoretical basis and valuable practical experience for future similar goaf grouting effect detection works so can be promoted under the circumstance.