摘要
为了降低隧道爆破施工对临近古迹等敏感建筑物的安全威胁,依托新建石板沟一号公路隧道工程,通过现场监测和数值模拟,揭示了不同掏槽眼型式与传播介质参数对临近古迹的减振规律。对上台阶全断面爆破施工阶段进行监测,发现影响控制点振速峰值的主要因素为掏槽眼爆破,其中寺内水平向振速VR显著较大;在爆破断面距寺庙约60 m处V_(R)达到0.961 cm/s,即将超出1.0 cm/s的安全限值,建议以60 m为分界线调整爆破方案。为兼顾施工效率和爆破减振,利用数值模拟对掏槽型式与台阶法施工参数进行研究,结果表明,掏槽型式与仰拱开挖对控制点的影响具有区段性,采取斜眼掏槽型式、及时开挖仰拱、增大台阶长度和台阶高度分别能够减小控制点振速峰值0.071 cm/s、0.039 cm/s、0.097 cm/s、0.065 cm/s。为保证工程顺利进行,最终提出三区段小导洞先行爆破施工方案和相关辅助减震措施,有效控制了隧道爆破对古迹的振动影响。
In order to reduce the safety threat of tunnel blasting construction to sensitive buildings such as adjacent monuments,based on the new Shibangou No.1 highway tunnel project,through on-site monitoring and numerical simulation,the vibration reduction law of different cutting hole types and propagation medium parameters on adjacent monuments is revealed.By monitoring the whole section blasting construction stage of the upper bench,it is found that the main factor affecting the peak vibration velocity of the control point is the cutting hole blasting,and the horizontal vibration velocity V_(R) in the temple is significantly larger.VR reaches 0.961 cm/s at the blasting section about 60 m away from the temple,which is about to exceed the safety limit of 1.0 cm/s.It is suggested to adjust the blasting scheme with 60 m as the dividing line.In order to take into account the construction efficiency and blasting vibration reduction,the numerical simulation is used to study the construction parameters of the cutting type and the step method.The analysis shows that the influence of the cutting type and the inverted arch excavation on the control point is sectional.The inclined hole cutting type,the timely excavation of the inverted arch,the increase of the step length and the step height can reduce the peak vibration velocity of the control point by 0.071 cm/s,0.039 cm/s,0.097 cm/s and 0.065 cm/s,respectively.In order to ensure the smooth progress of the project,the three-section small pilot tunnel first blasting construction scheme and related auxiliary shock absorption measures are finally proposed,which effectively controls the vibration impact of tunnel blasting on ancient sites.
作者
王延雨
温小宝
王军
叶飞
曹凯
Wang Yanyu;Wen Xiaobao;Wang Jun;Ye Fei;Cao Kai(China Railway 16th Bureau Group Co.,Ltd.,Beijing 100018,P.R.China;School of Highway,Changan University,Xi'an 710064,P.R.China;Huzhou Nanxun District Traffic Investment Group Co.,Ltd.,Huzhou Zhejiang,313009,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2024年第2期645-656,共12页
Chinese Journal of Underground Space and Engineering
关键词
隧道爆破
爆破振动响应
控制爆破技术
区段划分
方案优化
tunnel blasting
blasting vibration response
controlled blasting technology
section division
scheme optimization
作者简介
王延雨(1983-),男,河北承德人,高级工程师,主要从事隧道工程领域的项目经理工作。E-mail:29434689@qq.com;通讯作者:叶飞(1977-),男,陕西安康人,博士,教授,主要从事岩土工程、地下工程等领域的研究工作。E-mail:xianyefei@163.com。
