The natural frequency of coal is one of the important technical parameters for the application of the permeability enhancement technology of coal and rock forced vibration. Aiming at exploring the ...

The instability of soil slope boulders represents a prevalent geological hazard, characterized by its sudden onset and significant threats to engineering safety. However, the burial depth of boulders, ...

A natural experiment is an empirical study in which individuals (or clusters of individuals) are exposed to the experimental and control conditions that are determined by nature or by other factors ...