边坡岩体开挖爆破损伤的影响因素研究

Influencing Factors of Excavation Blasting Induced Damage in Slope Rock Mass

分析边坡岩体开挖爆破损伤的影响因素,并基于ANSYS/LS-DYNA的二次开发数值仿真技术,对不同开挖方式、炸药类型和岩性条件的边坡岩体开挖损伤分布研究表明,光面爆破开挖的爆破损伤具有明显的累积效应,会在保留岩体中沿轮廓面分布较大范围轻度损伤区;预裂爆破开挖在保留岩体中沿轮廓面分布较大范围的高程度损伤区;高爆速、高威力的炸药对保留岩体的损伤大;岩石强度越软,岩体受爆破开挖的影响越大,损伤区分布范围越大。

Blasting construction is mass. The influencing factors of b commonly adopted in rock slope excavation, lasting induced damage in slope rock mass are ried out to study the blasting induced damage distribution in slope rock mass with types and rock conditions using the that, a large scope of slight damage which could cause damage to the rock analyzed. Numerical analyses are car- different excavation methods, explosive secondary development platform in ANSYS/LS- DYNA software. The resuhs show area is distributed along the profile surface of the remaining rock and obvious accu- mulation effect is observed in smooth surface blasting excavation. While for the pre-splitting blasting excavation, a large scope of high damage area is distributed along the profile surface of the remaining rock. The explosive with high detona- tion velocity and high power will cause large damage to the remaining rock mass. The softer the rock is, the greater the effect of blasting excavation on the rock mass, and the larger the distribution of damage zone.