As a new mechanism to cause karst collapse, the positive pressure effect causes geological disasters that seriously affect the safety of people's lives and properties in karst areas. If we can understand the characteristics and rules of karst soil cavities in different evolutionary stages from the kinetic point of view, it can play an important role in saving the funds for engineering investigation, reducing the cost of soil cavity treatment and reducing the risk of engineering disasters. Therefore, in this paper, based on the analysis of the damage mechanism of karst soil cavern under the effect of positive pressure, based on the ASCII text provided by FLAC itself, the orthorectified simulation calculation program is prepared and finite element analysis is realized in FLAC3D, focusing on the uneven change of soil displacement, stress redistribution and plastic damage of karst soil cavern in different evolutionary stages under the effect of positive pressure, and summarizing the the stress, strain and damage characteristics and rules of plastic zone in karst soil caverns at different evolutionary stages are summarized. It is hoped that the research results will be of scientific value to deepen the research on the theory of cave-in prevention and control of covered karst soil caverns.

来源平台：PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ENERGY ENGINEERING AND ENVIRONMENTAL ENGINEERING, ICEEEE 2023