Identification of the key geo-environmental constraining factors on underground space

as well as the evaluation on geo-environment is very important to unban geological survey and underground construction in Suzhou.In this study

topography

types of construction sites

unfavorable geotechnical conditions

hydro-geological characteristics and earthquake geological hazards are considered as the main indexes of thematic layer in geo-environmental evaluation.Furthermore

both the Analytical Hierarchy Process（AHP）and expert questionnaires survey methods are utilized to calculate the weights of evaluation indexes.At last

the mathematical evaluation model is established by massive aim linear weight function method and the evaluation results can be statistic in classified levels.Due to the existence of spatial variability of geo-environmental factors

the underground space exploration from the depth of 0-15m and 15-30m are respectively evaluated.It is indicated from the comprehensive evaluation result that: bedrock mountain area in the west is suitable for underground exploration

but it does not include the area where serious geological disasters frequently take place.In contrast

there is a relatively low quality in the eastern plain area

because there is a wide distribution of water system

lakes

rivers

thick soft soil and complex hydro-geological conditions.