A SIMULATION OF CONTROLED BLASTING WITH CONTINUOUS SLOT BY DISCRETE ELEMENT ANALYSIS AND ELUCIDATION OF THE VIBRATION REDUCTION EFFECT

心抜き自由面発破の個別要素解析と振動低減効果の解明

It is known that the controlled blasting with continuous slot can largely reduce blasting vibration. However, the mechanism of its effect has not been discussed yet. Therefore, the design of the rational blasting pattern in the controlled blasting with continuous slot was difficult to be realized. In this study, the vibration reduction due to the employment of the controlled blasting with continuous slot is discussed from the viewpoints of the fracture behavior, the energy balance in the neighborhood of blasthole and the wave energy radiated to the far field. To this end, numerical experiments are achieved, and the role of free face and the dynamic nature of radiated waves are investigated. 切羽外周部あるいは中央部に自由面を形成する制御発破(以下,自由面発破と呼ぶ)では,発破振動を大幅に低減できることが知られている.一方で,その効果メカニズムについての議論は,これまでほとんどなされていなかった.このため,自由面発破における合理的な発破パターンの設計は実現困難であり,もっぱら経験的に行われてきた. 本論文では,個別要素解析手法を適用するとともに,発破孔近傍における破壊挙動やエネルギー収支および発破孔遠方における波動場に着目することで,自由面発破の振動低減効果について検証した.この結果,自由面発破における振動低減メカニズムを推測するとともに,特徴的な波動の伝搬特性を確認することができた.

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  • Accession Number: 01633661
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Feb 25 2017 3:24PM