摘要
运用有限元软件AUTODYN 2D计算爆炸荷载与离散元软件UDEC模拟节理岩体相结合的方法研究了节理几何特征对预裂爆破的影响。通过计算可知,预裂爆破时炮孔间的节理组对预裂成缝的影响明显,当节理法线与炮孔连线夹角在一定范围内时,预裂缝沿炮孔连线方向的平直程度随节理与炮孔连线夹角的增大而逐渐趋于平直,其中当节理组与炮孔连线夹角为90°时成缝效果最好,裂缝与炮孔连线基本重合,与理论分析较一致;节理间距对预裂爆破有较大影响,相同条件下节理间距越小,越难形成连通裂缝,减小炮孔间距有利于小节理间距情况下的预裂缝贯通。
The result of presplit blasting influenced by geometrical characteristics of joints are combining studied by the software AUTODYN 2D and UDEC.By calculating,the impact of geometrical characteristics of joints can be found through the crack extension between the blasting hole.The straight level of the cracks between the blasting hole are gradually enhanced with the increasing of angle between the joints and the borehole connection;and the angle of 90-degree can get the best result that the crack will be coincided with the borehole connection;and it is also in accord with the theoretical analysis.Joints space has significant impact on the presplit blasting;and the smaller joint space the rock has the more difficult the cracks connected.Reducing the space of boreholes is conducive to form the linked up cracks.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第12期3812-3820,共9页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.50809070)
十一五科技支撑计划课题(No.2008DAB29B00)
河南省教育厅自然科学研究计划项目(No.2009B560009)
关键词
离散元
爆炸荷载
节理岩体
预裂爆破
裂缝
discrete element method
blasting load
jointed rock mass
presplit blasting
crack
