“…The development of a karst collapse is closely correlated with the air–water pressure in the underground karst channel. , To monitor the karst collapse hazard caused by groundwater activities in rock formations, groundwater level and water–air pressure sensors are placed in karst cavities in karst areas to monitor groundwater level data and water–air pressure. − Pan et al monitored the groundwater variation process in a closed mine in a karst area, and they found many sinkhole collapses were caused by the groundwater level fluctuation . In terms of air pressure monitoring, many techniques were developed including an automatic monitoring method of the water–air pressure sensor, − dynamic real-time groundwater monitoring, − and Internet of Things technology, − which have been used in field monitoring and for early warning of karst collapse. , Jiang, Lei, and Zhao developed the specific air pressure monitoring techniques for karst collapse monitoring and used them to monitor many field karst collapses. , They collected a large amount of air pressure data caused by groundwater level fluctuation, which is useful in karst collapse predication. Overall, the groundwater activity can lead to high air–water pressure and induce karst collapse.…”