Recent years has seen the rapid development of rail transit and comprehensive development of underground and aboveground facilities. Against this backdrop, it is imperative to develop a suitable safe evacuation mode for ultradeep underground public spaces. From the perspective of building design, this paper combines the horizontal shelter and vertical evacuation system into a novel safe evacuation mode, consisting of horizontal evacuation, vertical escape route, emergency shelter, horizontal escape route, vertical evacuation system and exit evacuation. Then, building information modelling (BIM) was adopted to simulate the application of our safe evacuation mode to Hongtudi Station, Line 10 of Chongqing Rail Transit (CRT). The results prove that our safe evacuation mode is feasible for evacuating personnel in ultradeep underground public spaces. The research findings shed new light on the safe evacuation technology in ultradeep underground public spaces.

In urban rail transit projects, the traditional method of foundation evaluation faces problems like vague description, unclear process, and fuzzy evaluation system. To solve these problems, this paper sets up a scientific evaluation system based on CGB technology integration and analytic hierarchy process (AHP). The CGB technology integration refers to the integrated application of computer-aided design (CAD), geographic information system (GIS), and building information modeling (BIM). Taking Qingxihe Station, Line 6 of Chongqing Rail Transit (CRT) as the object, the authors constructed a 3D geological model of the construction site, created a novel three-layer system through data analysis, and evaluated and compared the suitability of each layer as the supporting layer of the foundation. Finally, effective suggestions were put forward on the selection of the supporting layer. Our research successfully visualizes the whole process of foundation evaluation, and enhances the accuracy of the evaluation results. The research findings provide a good reference for the selection of the supporting layer of foundations in urban rail transit projects.

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