Abstract
Modeling of Post-Failure Behavior of the Rock Mass and its Effect on the Stress-Deformation State in the Vicinity of a Mining Excavation
Highlights
The mechanism of rock mass impact on the support of the underground excavation roadway has been the subject of numerous studies presented, among others in the works [4, 18, 30]
In one of them, discussed, e.g. in the works [5, 15, 16, 26], it is assumed that a plastic zone is created around the excavation, and behind it the rock mass retains the characteristics of a elastic medium
In the case when no residual plastic zone is formed in the rock mass around the excavation, the rock medium in the post-elastic stage is considered as a plastic medium with softening
Summary
The mechanism of rock mass impact on the support of the underground excavation roadway has been the subject of numerous studies presented, among others in the works [4, 18, 30]. On the basis of the studies [13, 31], the relationships showing the state of stresses, deformations and displacements of the rock mass with features of the elastic-plastic medium with strain-softening and relationship defining the rock mass pressure exerted on the support, were given. The analysis of these relationships for geomechanical conditions characterizing the Carboniferous rock mass in the Lubelski Węgiel “Bogdanka” Społka Akcyjna [Inc.] was carried out. Where: σ1 i σ3 are the main stresses, the highest and the lowest, respectively, acting in the plane of the excavation, K0=(1+sinφ0)/(1-sinφ0), MODEL AND ASSUMPTIONS OF
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