Interaction Mechanism Between Granular Backfill and Rock Pillar Under Lateral Confined Conditions

doi:10.12068/j.issn.1005-3026.2021.01.019

Abstract

Abstract: In the dry filling mining method， in order to study the interactions between the granular backfills and surrounding rock， and analyze the influence of backfills on the mechanical properties of pillars， a self-made device was used to test the axial compressive properties of rock pillar confined by granular backfills and a series of compressive tests of rock pillar were conducted considering the various particle size of the granular backfills. The results show that the granular backfills improve the stress state of the rock pillar， and the peak and residual compressive strengths of rock pillar are enhanced due to the passive lateral support of the granular backfills. Meanwhile， the failure pattern of the rock pillar has changed. With an increase of the particle size of granular backfills， the interaction between the granular backfills and the rock pillar intensifies first and then weakens. On this basis of testing results， the model for bearing capacity of pillar is established considering the interaction between granular backfills and rock pillar， and the relationship between the deformation modulus of granular backfills and rock pillar is given.

Key words: granular backfill; lateral confined compression test of rock pillar; passive lateral support; interaction; deformation modulus

CLC Number:

TD853

LE Zhi-hua， YU Qing-lei， ZHENG Hao-tian， CAO Yong-sheng. Interaction Mechanism Between Granular Backfill and Rock Pillar Under Lateral Confined Conditions[J]. Journal of Northeastern University(Natural Science), 2021, 42(1): 124-130.

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