Research on the Key Technologies for High-speed Railway's Large Range Crossing of Goaf
Research purposes:Taiyuan-Jiaozuo Railway is the first high-speed railway project to pass through a large area of goaf,and it is also the most widely distributed and complex high-speed railway project to pass through goaf in the world so far.Conducting relevant research is of great significance for identifying the distribution of goafs,selecting appropriate line locations,and determining safe measures for road,bridge,and tunnel engineering.Research conclusions:(1)A multidisciplinary,multi-level,and multi method coupled exploration technology for goaf has been developed,and a 200 m safe passage has been found in the dense belt of goaf with a width of up to 37 km.A geological corridor of"two throats,one passage,six detours,and two treatments"has been proposed.(2)Research has formed a multi-dimensional spatial route selection technology,which avoids areas such as ancient kilns that are densely populated and difficult to identify over time.When the plane cannot be avoided,some sections of the route pass through the safe depth below the goaf in the form of tunnels.(3)The technology of tunnel underpass through goaf has been developed,and tunnel support measures and detection,prediction,and quality inspection methods have been proposed through the study of surrounding rock stability and the distance of tunnel underpass through goaf.(4)The roadbed improvement techniques has been formed.In response to the characteristics of large burial depth and high settlement requirements in goaf areas,the measures such as reducing the spacing of grouting holes,adjusting the grouting fluid,and increasing the grouting pressure have been taken to ensure the improvement effect,providing reference for other types of engineering.
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