Journal of Engineering Research

The development characteristics of concealed karst soil caves are important factors affecting the occurrence mechanism and sensitivity distribution of surface collapse. By studying the spatial morphology, scale combination and distribution law of karst soil caves, the mechanism of their influence on the triggering conditions and development trends of surface collapse can be revealed. The analysis shows that the expansion of soil cave scale and the enhancement of connectivity will significantly increase the sensitivity of surface collapse, while the soil structure and groundwater dynamic conditions are the key regulatory factors. Further combining typical cases and monitoring data, and comparing the collapse characteristics of different karst areas, it can be found that the more complex the development degree of soil caves, the more concentrated the collapse risk and the higher the unpredictability. Accurately identifying the development characteristics of concealed karst soil caves and establishing a sensitivity evaluation system have important practical significance for geological disaster prevention and control and site selection for engineering construction.

Concealed karst; Soil cave development; Surface collapse; Sensitivity analysis