Risk Assessment of Collapse Disaster at the Entrance of Yumenkou Tunnel
[Purposes]During the construction process of the Yumenkou Tunnel located in Shanxi,China,it was discovered that there were many rock collapses and falls on the steep cliffs above the tunnel en-trance,seriously threatening the normal operation of the Haoji Railway.In order to protect the engineer-ing area,a comprehensive analysis of rock collapse disasters was conducted.[Methods]Combing with on-site investigations and high-precision aerial imaging data from drones,this study utilized RocPro3D theory and methods to conduct numerical simulation studies on 64 unstable rock masses discovered.The three-dimensional motion path,velocity,bounce height,frequency,and stopping point parameters of the hazardous rock masses were analyzed.A collapse risk assessment model was constructed using the above four parameters as evaluation factors.[Findings]The danger level of bridge anchors and bridge tunnel engineering areas in the study area is at a moderate or above level,while the danger level of the affected section of the Longhu Highway is between low and high.[Conclusions]The combination of simulation re-sults and actual investigation provides a reasonable basis for selecting prevention and control measures for collapse and rockfall.
dangerous rock massnumerical simulationRocPro3Dhazard assessment
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