Abstract: Based on the geographic information system (GIS) and numerical simulation software, a scheme was proposed to achieve the strong applicability and smooth operation of three-dimensional slope modelling and simulation. This scheme can make full use of the historical data of complex slopes and truly realize the entire process of slope simulation, including processing survey data, establishing slope model, stability analysis and result feedback. The modelling theory and method of surface and soil layers are analyzed in depth to establish a model that meets the accuracy requirements. The three-dimensional modelling of the slope is completed by GRASS, and detailed error analysis is discussed on the established model. The coupling of GIS and numerical simulation software is realized in the Python language. The data transfer and format conversion between different platforms can be completed through self-compiled programs and data interfaces, which can avoid the loss or distortion of the data in the transmission process. Python can also deeply mine the model data. Finally, this scheme is verified by Hangkouling tunnel project. The analysis results show that the three-dimensional slope model established by this scheme has characteristics of high speed and high precision and can accurately reflect the actual slope condition and search for the most dangerous area of the slope.

Key words: geographic information system (GIS), software coupling, simulation of three-dimensional geological structure, slope stability analysis, radial basis function interpolation