SUITABILITY EVALUATION OF ENVIRONMENTAL GEOLOGY BASED ON SPONGY BODY IN-SITU TEST AND ITS APPLICATION: A Case Study of Xinxiang City, Henan Province

Sponge city is an ecological concept proposed to solve the problem of rainfall flood in urban construction, aiming to realize the comprehensive treatment of urban water resources by means of seepage, storage, purification and discharge. Starting with the environmental geological conditions and considering the sponge properties of geological bodies in sponge city construction, the study carries out the in-situ double-ring infiltration test and engineering drilling in the study area, analyzes the maximum rainfall infiltration depth and surface soil water seepage speed in the original sponge geological conditions, and proposes two indexes of water seepage and storage which can effectively represent and summarize the environmental geological suitability in sponge city construction, with strong universality, easy to spread. Finally, Xinxiang City in central China is taken as an example to evaluate the environmental geological suitability of sponge city construction