Bond interface crack propagation of fresh foundation concrete and rock under blasting load

• 来源期刊: 煤炭学报（英文版）
• 年，卷（期）: 2009,（1）
• 页码范围: 61-65
• 页数: 5页
• 语种: 英文
• DOI: 10.1007s12404-009-0112-y

摘要

According to concrete age,the dynamic stress intensity factors of bond inter-face crack of concrete-rock was calculated.Result shows that the propagation of concrete interface crack is mainly caused by tensile stress and shear stress for stress wave reflec-tion.With the growth of concrete age,interface crack fracture toughness increases,and its capacity of resisting blasting load strengthens.Therefore,blasting vibration should be strictly controlled for fresh concrete.