摘要
由于地质条件及岩石分布的不规则性,爆破开挖诱发的振动在隧洞掌子面后方两侧对称位置处的传播规律表现出明显的非对称特点。以新疆奎屯河引水工程为背景,基于开展的顺层隧洞爆破振动监测实验,分析了掏槽、辅助、周边和底板等典型段别爆破作用下,爆破掌子面后方隧洞环向和纵向的非对称振动响应特性及振动传播规律。结果表明:受顺层节理的影响,掌子面后方隧洞两侧相同距离处三向速度峰值大小不同,沿隧洞轴向与垂直隧洞壁方向的振速两侧相同位置的振速比值为1.5~2.5;竖直方向峰值振速差别相对较小,两侧相同位置的振速比值为1.1~1.5。沿隧洞纵向方向,距掌子面距离26 m范围内,振动速度衰减较快,随后衰减速率明显降低,两侧振速的非对称特征逐渐不显著。研究成果对同类工程施工中的爆破振动控制与爆破参数设计具有一定的借鉴作用。
Due to the geological situation and the irregularity of rock distribution,the propagation of vibration induced by blasting excavation at the symmetrical position on both sides behind the face of the tunnel shows obvious asymmetric characteristics.Taking the Kuitun River diversion project in Xinjiang as the background,the blasting vibration monitoring experiment of bedding tunnel has been carried out,and the asymmetric vibration response characteristics of circumferential and longitudinal vibration of tunnel behind blasting face under the action of cutting,auxiliary,peripheral and floor blasting are analyzed.The results show that due to the influence of bedding joints,the peak values of three-dimensional velocity at the same distance between the two sides of the tunnel behind the palm face are different,and the ratio of vibration velocity at the same position along the axial direction of the tunnel and the vertical direction of the tunnel wall is 1.5~2.5.The difference of the peak velocity in the vertical direction is relatively small,and the ratio of the vibration velocity at the same position on both sides is 1.1~1.5.Along the longitudinal direction of the tunnel,within the range of 26 m from the face of the palm,the vibration velocity attenuates rapidly,and then decreases obviously,and the asymmetric characteristics of the vibration velocity on both sides are gradually not obvious.The research results can be used as a reference for blasting vibration control and blasting parameter design in the construction of similar projects.
作者
刘西森
于建新
魏海霞
吴卫东
姜波
LIU Xisen;YU Jianxin;WEI Haixia;WU Weidong;JIANG Bo(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Xinjiang Bingtuan Water Resources and Hydropower Engineering Group Co.,Ltd.,Urumqi 830054,China;Xinjiang Eighth Division Shihezi City Water Conservancy Project Management Service Center,Shihezi 832000,China)
出处
《金属矿山》
CAS
北大核心
2022年第6期61-67,共7页
Metal Mine
基金
国家自然科学基金项目(编号:42107200)
河南省科技攻关计划项目(编号:212102310598)。
关键词
隧道爆破
顺层节理
非对称振动
传播规律
tunnel blasting
bedding joint
asymmetric vibration
propagation regularity
