Abstract：Research purposes: In order to realize the dynamic assessment of the construction risk of subgrade engineering, a subgrade engineering construction risk assessment model based on the dynamic weight-2-dimensional cloud model is proposed by taking the subgrade engineering in the special environment in the perilous mountainous area of Southwest China as the research subject. Research conclusions: (1) Based on the risk influencing factors existing in general subgrade construction, and considering the complex geological environment and characteristics of subgrade construction in perilous mountainous areas, the risk assessment system of subgrade engineering construction in perilous mountainous areas is constructed, and the dynamic risk information of subgrade engineering construction feedback is taken as the benchmark, and the dynamic weight model is used as the index to give weight. (2) A 2-dimensional cloud model for risk assessment was constructed with risk probability and risk loss as the basic variables, and a certain section of subgrade engineering from Xingwen to Bijie section of Chengdu-Guiyan Railway was taken as an example. The model was used to evaluate the risk of its construction, and MATLAB is used to draw the risk cloud diagram to intuitively reflect the degree of risk, and finally the risk level is determined by calculating the nearness degree to ensure the accuracy of the evaluation result. (3) The results show that the risks of subgrade construction in perilous mountainous areas mainly come from the natural and geological risks as well as the material, equipment and construction technology risks caused by them. (4) The research result can provide a reference for the risk prevention and control of subgrade construction in perilous mountainous areas.
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2022, Vol. 39 
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