摘要
为了研究高陡边坡特大桥锚碇隧洞开挖爆破振动效应特征,解决因锚碇隧洞断面大,轮廓多异,面积急变,与公路隧道间呈小净距关系,且洞口易形成卸载裂缝或孤石偏压套拱,而出现的开挖爆破对中隔岩柱损伤,围岩和洞口坍塌或滑坡,增加未来大桥营运风险等问题,通过基于锚碇隧洞及公路隧道结构特点、空间展布形态及其相互空间关系,结合赤水河大桥四川岸地貌、地质构造、岩层、岩性特点,依据爆源因素与爆破地震波能量密度分布相关性,借鉴监测验证,对隧洞锚碇开挖爆破振动效应特征分析,以指导优化爆破工艺,加强支护,确保围岩、中隔岩柱、洞口稳定,保证顺利施工。
In order to study the characteristics of blasting vibration effect in the excavation of anchorage tunnel, with large cross-section, varied contour, rapid change of area, small clear distance relationship with highway tunnel, of super large bridge with high steep slope, the problems, are to be solved, that unloading cracks or unsymmetrical pressure arch are easy to be formed and result in that the excavation blasting will damage the rock pillar, cause the collapse of surrounding rock and portal slid, and increase the operation risk of the bridge in the future topic.Based on the structural characteristics, spatial distribution patterns and their spatial relationships of anchorage tunnels and highway tunnels, combined with the geomorphology, geological structure, rock stratum and lithology characteristics of Chishui River Bridge in Sichuan, according to the correlation between blasting source factors and energy density distribution of blasting seismic wave, and referring to monitoring verification, the characteristics of blasting vibration effect of tunnel anchorage excavation are analyzed to guide the optimization of blasting technology, by strengthening the support, the stability of surrounding rock, middle rock pillar and portal is ensured so that the construction is successful.
作者
张丹
郑彩英
王祥
郭勇
ZHANG Dan;ZHENG Cai-ying;WANG Xiang;GUO yong(Sichuan Road and Bridge Construction Group Co.,Ltd.,Chengdu 610041,China;Sichuan Academy of Safety Science and Technology,Chengdu 610045,China)
出处
《工程爆破》
CSCD
北大核心
2022年第6期130-136,共7页
Engineering Blasting
关键词
锚碇隧洞
特大桥
爆破振动
中隔岩柱
小净距
anchorage tunnel
super bridge
blasting vibration
mid-part pillar
closely spaced tunnels
