Abstract: Extreme rainstorm events and insufficient drainage facilities are very likely to lead to urban rain flood. The construction of large-scale rainwater pipe culverts based on the surrounding environmental safety assessment is an important measure for urban rain flood prevention. This paper takes the newly built rainwater pipe culvert project of Kefeng bridge in Fengtai district, Beijing city as the object, introduces risk chain theory, and uses fuzzy synthesis and MIDAS/GTS numerical simulation method to evaluate the surrounding land use risk during the construction period of the project. Research has shown that: ① During the construction period of the project, the risk impact levels of different land types around the project are different, and the deformation of the surrounding soil is concentrated within the range of 0～18 m outside the project, with 0~4 m being the high-risk area for deformation; ② The land deformation within a range of 80 m around the intersection of this project and urban underground pipelines shows an upward trend. The area between 0～12 m at the intersection is a high-risk area for uplift, and key monitoring and warning are required. In conclusion,the research results of the paper have reference value for quality monitoring of similar engineering projects and risk prevention of surrounding land use in China.

Key words: stormwater culverts, surrounding land, construction period, risk assessment, numerical simulation