Objective Underground space resources are important national resources. For the scientific and rational protect and develop them, it is necessary to conduct suitability evaluations for the development and utilization of underground space resources.

Method Based on Python and Paraview software, the 3D suitability evaluation of −100～0 m underground space of Zhongshan city was realized by bilinear interpolation method and analytic hierarchy process. The data of 8192 bore holes was collected and analyzed, and five 3D data of single factor (spt blow count, water content, internal friction angle, compression modulus and compressive strength) was obtained. In addition, the geotechnical conditions, hydrogeological conditions, adverse geological conditions, resource sensitivity and development value were selected as theme layer, them contain 21 signal factor 2D data. The coupling calculation of 2D and 3D data is realized based on the variable weight method.

Results The spatial domain of the underground −100~0 m in Zhongshan city was established an analyzed, and the spatial domain was divided into 128 million units, each of which is assigned 21 single factor attribute values. Then, a three−dimensional evaluation of the suitability of underground space in Zhongshan city through AHP and bilinear interpolation, and finally visualized it through Paraview software.

Conclusions The suitability of development and utilization of the underground space of Zhongshan City is overall good, with more than 88% area suitable for foundation pit and pile foundation projects, and more than 83.5% area suitable for tunnel projects.