隧道近接穿越古迹爆破施工安全控制技术
The Safety Control Technology of the Blasting Construction of the Tunnel in Close Distance with the Historic Site
王延雨 1温小宝 2王军 1叶飞 2曹凯3
作者信息
- 1. 中铁十六局集团第一工程有限公司,北京 100018
- 2. 长安大学公路学院,西安 710064
- 3. 长安大学公路学院,西安 710064;湖州市南浔区交通投资集团有限公司,浙江湖州 313009
- 折叠
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VR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.
Abstract
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 VR in the temple is significantly larger.VRreaches 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.
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Key words
tunnel blasting/blasting vibration response/controlled blasting technology/section division/scheme optimization引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据