摘要
基于福建泉州某引水工程在建隧洞近距离下穿既有隧洞及重要建(构)筑物的钻爆施工需求,采用数值模拟方法分别研究小空孔九孔直孔掏槽、大空孔单螺旋掏槽、三对孔水平楔形掏槽等三种常见掏槽爆破型式的岩石破碎机理及诱发的振动特性。探索既能够顾及隧洞开挖进尺效率,又能够满足爆破振动安全要求的掏槽孔布置型式和钻爆参数。在短进尺条件下,采用三对孔水平楔形掏槽布置型式,所形成的槽腔面积相对较大,并因岩体中有效应力更小,所诱发的爆破振动强度相对偏低。反映在隧洞钻爆的爆破振动时程上,由三对孔水平楔形掏槽爆破引起的爆破振动值没有特别突出的现象。
Drilling and blasting construction is used in a water diversion project in Quanzhou,Fujian Province,which is running through an existing tunnel and an important building(structure)in a short distance.Numerical simulation method is used to study the rock breaking mechanism and induced vibration characteristics of three common types of cut blasting,namely,small hollow empty hole nine-hole straight cut,large hollow empty hole single screw cut and three pairs of hole horizontal wedge cut.To explore the cutting hole layout and drilling and blasting parameters that can not only take the excavation footage efficiency of the tunnel into account,but also meet the safety requirements of blasting vibrations.Under the condition of short footage,the layout of three pairs of hole horizontal wedge cut is adopted,resulting in a relatively large cavity area,and a relatively low blasting vibration intensity due to the smaller effective stress in the rock mass.As reflected in the blasting vibration time history of tunnel drilling and blasting,the blasting vibration values caused by the three pairs of hole horizontal wedge cut is not particularly prominent.
作者
欧明鑫
舒大强
张承睿
林博闻
李洋
OU Ming-xin;SHU Da-qiang;ZHANG Cheng-rui;LIN Bo-wen;LI Yang(School of Water Resources and Hydropower Engineering,Wuhan University,Wuhan 430072,China;Zhongnan Engineering Corporation Limited,Changsha 410014,China)
出处
《爆破》
CSCD
北大核心
2020年第1期27-31,39,共6页
Blasting
基金
国家自然科学基金面上项目(51979205)。
关键词
隧洞掘进
掏槽型式
数值模拟
破碎机理
振动特性
tunnel drivage
type of cutting
numerical simulation
crushing mechanism
vibration characteristics
