This paper focuses on the research of a urban-level 3D geological big data platform based on geotechnical engineering investigations for subway engineering. With the national emphasis on informatization construction and the development demands of industry

the limitations of traditional geotechnical investigation methods have become apparent

making the construction of a big data platform inevitable. The study aims to develop a 3D geological model for Hangzhou's subway projects and a regional engineering geological big data platform

enabling multi-parameter query and statistical functions. By overcoming key technologies such as multi-source data fusion

complex geological modeling

and the integration of BIM and GIS

multi-source data are integrated

and a series of functional modules are developed and applied. Currently

the platform has largely resolved data and modeling challenges

improving the efficiency of investigation and production management

and playing a significant role throughout the entire investigation process. In the future

continuous improvements efforts should focus on platform interfaces

application standards

model coordination

data lightweighting

and intelligent analysis to expand its application scope

enhance performance

and better serve the fields of geological investigations and engineering construction

thereby promoting digital transformation and sustainable development in the industry.