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Analysis on Damaging Mechanism of Sand-Mud Interbedded Strata Type Perilous Rock
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Abstract
Aiming at the sand-mud interbedded strata type perilous rock, this paper comprehensively analyzes the reason of formation of perilous rock and its structural characteristics, builds the physical and mechanical mode of the sand-mud interbedded strata type perilous rock, puts forward the base retreat mechanism that the mudstone’s softening, compression and deformation induce the tension damage of thin layer sandstone, explains slip-shear damage mode and dump-fall damage mode of perilous rock, and proposes mechanical criteria of two damage modes. According to the results of case analysis, the base retreat of perilous rock in Leijiagou conforms to the mechanical mechanisms of the tension and damage of thin layer sandstone induced by the softening, compression and deformation. Under current situations, there will be no slip-shear damage or dump-fall damage for the Leijiagou Perilous Rock. According to preliminary projections, the Leijiagou Perilous Rock will lose its stability after 15.2 years, with the damage mode being dump-fall damage and the critical depth of cavity being 4.1m.
Title: Analysis on Damaging Mechanism of Sand-Mud Interbedded Strata Type Perilous Rock
Description:
Abstract
Aiming at the sand-mud interbedded strata type perilous rock, this paper comprehensively analyzes the reason of formation of perilous rock and its structural characteristics, builds the physical and mechanical mode of the sand-mud interbedded strata type perilous rock, puts forward the base retreat mechanism that the mudstone’s softening, compression and deformation induce the tension damage of thin layer sandstone, explains slip-shear damage mode and dump-fall damage mode of perilous rock, and proposes mechanical criteria of two damage modes.
According to the results of case analysis, the base retreat of perilous rock in Leijiagou conforms to the mechanical mechanisms of the tension and damage of thin layer sandstone induced by the softening, compression and deformation.
Under current situations, there will be no slip-shear damage or dump-fall damage for the Leijiagou Perilous Rock.
According to preliminary projections, the Leijiagou Perilous Rock will lose its stability after 15.
2 years, with the damage mode being dump-fall damage and the critical depth of cavity being 4.
1m.
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