Bed separation backfill to reduce surface cracking due to mining under thick and hard conglomerate: a case study.

ABSTRACT: After coal mining, the surface above a goaf may experience the discontinuous deformation under some special geological and mining conditions, such as surface cracking, surface step subsidence and collapse pits. Discontinuous deformation seriously threatens the safety of surface buildings and infrastructures. In this paper, the mechanism of discontinuous surface deformation and surface cracking due to coal mining under thick and hard conglomerate in the Huafeng coal mine was studied using a simulation test on similar materials. Bed separation backfill was then proposed to control surface cracking and to protect the Luli bridge. Because of lithological differences between the conglomerate and relatively weak red strata (beneath the conglomerate), the bed separation occurred between them with

SUBMITTER: Yin D 

PROVIDER: S-EPMC6731711 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature