Abstract: The scope of geotechnical investigation is to provide related accurate guidance and reference parameters for the upcoming engineering construction. For projects within complex geological subsurface conditions, the technical requirements for geotechnical investigation are more comprehensive, the types of investigation methods are more, and the key technical problems to be solved are more stringent. A project in Jiading District of Shanghai is presented in the paper.  The complex building layout and site geological subsurface conditions of the proposed project, combined with similar engineering experience in Shanghai are briefed. Based on the collection of existing geological background data and pre-analysis, the relevant geotechnical parameters are obtained by comprehensive use of drilling, sampling, laboratory, in-situ testing and other investigation methods. To find out the engineering geological characteristics and changes of foundation soil within the scope of site investigation depth, a comprehensive assessment of soil characteristics is performed. Hydrology, site stability and building suitability under complex geological subsurface conditions of the project are evaluated, and the foundation treatment and related geotechnical suggestions to provide guidance for building construction are also proposed.

Key words: Shanghai Region, Complex Geology, Geotechnical Engineering, Exploration Methods