Effect of the main parameters of an explosion-reactive unit (ERU) on the size of the cavity formed in soft rock

Stepanov, Yu. S.; Solov’ev, V. O.

doi:10.1007/bf02506530

Cited by 2 publications

(1 citation statement)

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“…(1) The weight of the pillar is not considered； (2) Before entering the stage of crack extension, the deformation of pillar is small and overlying load did not change significantly； (3) In the mining process, rock plastic deformation did not change the constraint type of both ends of pillar; (4) In the process of damage, the elastic modulus and inertia moment of cross section of pillar maintained which meet the plane section assumption.…”

Section: Basic Assumptionsmentioning

confidence: 99%

Damage Creep Analysis and Instability Delay Time of Ultrahigh pillar considering Initial Transverse Deformation

Wei

Song

2019

E3S Web Conf.

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According to the ultrahigh pillar structure and mechanical characteristics, considering the initial geometric deviation caused by mining disturbance, the simplified model of the pressure bar is established. Based on elastic-plastic theory, the deflection and internal forces of ultrahigh pillar with initial geometric imperfections are analyzed and discussed. Based on the Kachanov theory of damage, the damage of ultrahigh pillar is analyzed, the damage failure time is calculated. The results show that under the influence of the initial deflection, pillar will appear different degree of additional deflection, which grows with the increase of initial deflection and pressure ratio. Analysis of engineering examples show that the start time of damage and instability of delay time of pillar has close relationship with initial deflection, pressure ratio and compressive strength. With the increase of pressure ratio and initial deflection, the damage incubation time and the instability of delay time quickly become small, the greater the compressive strength, the greater the instability of the delay time, which means that the pillar is more stable. The results of this study provide a theoretical basis for stability analysis and control of ultrahigh pillar.

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Section: Basic Assumptionsmentioning

confidence: 99%