Therefore, it is necessary to carry out monitoring and evaluation research on the risk of instability and disaster caused by the linkage of residual coal pillars and rock strata. The challenge of ...

Rime-covered rock pillars stretch up endlessly to the sky in the land of "Avatar" at Tianzishan Scenic Area of Zhangjiajie, central China's Hunan Province, Mar. 6, 2025. Zhangjiajie National Forest ...