互层状围岩隧道切槽爆破破岩规律研究  

Rock Fragmentation Patterns in Tunnels with Interbedded Surrounding Rock by Blasting with Slotted Blastholes

作　　者：熊成宇 张建 刘向阳 张学富[3] 黄耀民 胡波 余标 林高宇 XIONG Chengyu;ZHANG Jian;LIU Xiangyang;ZHANG Xuefu;HUANG Yaomin;HU Bo;YU Biao;LIN Gaoyu(The Fourth Engineering Co.,Ltd.of CCCC First Highway Engineering Co.,Ltd.,Nanning 530000,Guangxi,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Institute of Future Civil Engineering Science and Technology,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]中交一公局第四工程有限公司,广西南宁530000 [2]重庆交通大学土木工程学院,重庆400074 [3]重庆交通大学未来土木科技研究院,重庆400074

出　　处：《矿冶工程》2024年第6期11-15,共5页Mining and Metallurgical Engineering

基　　金：国家重点研发计划(2021YFB2600103-01);国家自然科学基金(52204087);重庆市交通科技项目(CQJT-CZKJ2023-04);重庆市教委科学技术研究项目(KJQN202200746)。

摘　　要：根据互层状围岩与周边孔的相对位置关系,对围岩互层面与两邻近周边孔连心线相对位置关系进行分类;采用LS-DYNA数值模拟方法,探究典型工况(围岩互层面与炮孔连心中垂线重合)下,互层面对孔间围岩爆破裂纹扩展的影响机理;并对围岩互层面与炮孔连心线不同相对位置关系下,围岩互层面对孔间围岩爆破成形效果的影响进行了研究。结果表明,砂岩中的爆破振动波传播速度略高于砂质泥岩中的传播速度;爆破荷载下,较软岩层和互层面上围岩受损严重;两炮孔爆破振动波峰叠加加剧了围岩损伤;互层面贯穿炮孔时爆破效果欠佳,互层面位于炮孔连心中垂线时爆破效果较理想。According to the relative position between interbedded surrounding rock and the peripheral holes,the relationship between bedding planes and the connecting line of the adjacent blastholes was classified into three kinds.Mechanism for bedding planes bringing impact to crack propagation in rocks between blastholes by blasting under typical work conditions(with bedding planes on the perpendicular bisector of the connecting line of blastholes) was explored by the LS-DYNA numerical simulation;and the effect of bedding planes in a different relative position to the connecting line of blastholes on the blasting effect of surrounding rock was also studied.It is found that the propagation speed of blasting vibration waves in sandstone is slightly higher than that in sandy mudstone.Under blasting loads,the surrounding rock above both softer layer and the beddings suffer severe damage.The superposition of two-blasthole blasting vibration wave peaks intensifies the damage to the surrounding rock.The blasting effect is poor when the bedding plane penetrates the blastholes,but the blasting effect is ideal if the bedding plane is on the perpendicular bisector of the connecting line of blastholes.

关 键 词：隧道爆破 互层状围岩 切槽爆破 裂纹扩展 互层面 周边孔 爆破振动 围岩损伤 

分 类 号：TD263[矿业工程—矿井建设] U455[建筑科学—桥梁与隧道工程]