Abstract: With the increasing demand of building functions, there are more and more projects for installing elevators in existing buildings. This paper presents a case history of an existing building with elevator foundation investigation project. The engineering geological conditions of the project site, the composition, engineering characteristics and distribution of the artificial fill are analyzed and evaluated. Feasible foundation options are provided by means of the field exploration and existing building data collection. The geotechnical investigation around the existing buildings should focus on the investigation of the spatial distribution of backfill soil, and fully identify the composition, engineering characteristics and distribution of the backfill soils; For possible underground structures, it is necessary to focus on the collecting construction drawings of existing buildings and relevant surrounding buildings. This paper describes the issues that are frequently encountered in the investigation of the artificial fill foundation and the appropriate foundation options. The relevant methods can be used for a reference in similar projects in the future.

Key words: Existing Buildings, Engineering Survey, Foundation Options, Artificial Fill