Physical simulation and theoretical evolution for ground fissures triggered by underground coal mining.

ABSTRACT: Underground coal mining activities are prone to cause movement and breakage in geological strata and also lead to mining subsidence and even ground fissures. Along the direction working panel advancing, ground fissures may occur in roof in front and/or behind working panel. However, the investigations of previous similarity tests in lab only emphasize on the region behind working panel. By improving strata material property in construction and mounting artificial pressure devices, two physical simulation tests were conducted and successfully investigated the simulated results. Then, the mechanical model of "cantilever beam and elastic foundation beam" was proposed to calculate the stress distribution and the crack initiation angle in overlying strata and it well explains the mechanisms of

SUBMITTER: Yang JH 

PROVIDER: S-EPMC5841665 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature