The influence of extensive caving zones on the state and behavior of the surface as a result of underground mining worksEvgeny Fedorov, Khaini-Kamal Kassymkanova, Gulnar Jangulova and Natalia MiletenkoE3S Web Conf., 192 (2020) 03009DOI: https://doi.org/10.1051/e3sconf/202019203009