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高速铁路隧道侧穿建筑物爆破减震技术研究

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随着高速铁路网的逐渐加密,隧道将不可避免地下穿、侧穿建(构)筑物,在保证建(构)筑物振动安全的前提下提高隧道掘进效率是施工中的重点与难点.以隧道侧穿建筑物为工程背景,通过数值计算对上台阶机械开挖+中、下台阶控制爆破工法进行研究,同时与上台阶控制爆破工法进行对比分析,结果表明:建筑物高程越高振动越明显,高程对于振速具有放大效应,放大倍数在2倍以上,施工时应当重点监测建筑物顶部的振速;上台阶采用机械开挖+中、下台阶控制爆破工法与上台阶控制爆破工法相比减震效率达到50%以上;上台阶采用机械开挖,中、下台阶采用控制爆破的开挖工法既能提高开挖效率、又能最大程度上减少对地表建筑物的振动影响,具有较高的推广及应用价值.
Blasting and Shock-absorbing Technologies for High-speed Railway Tunnel Side-crossing Buildings
As the high-speed railway network becomes more dense,tunnels will inevitably cross underneath or sideways through buildings(structures).Under the premise of ensuring the vibration safety of buildings(structures),improving the tunneling efficiency is the key and the difficulty of the construction.Taking the tunnel side-crossing the buildings as the engineering background,this paper studied the composite working method of upper-step mechanical excavation+middle and lower-step controlled blasting by the numerical calculation,and it was compared with the upper-step controlled blasting method.The results showed that the higher the elevation of the building,the more obvious the vibration,indicating that the elevation had an amplification effect on the vibration velocity with amplification factors of more than 2 times,and monitoring the vibration velocity of the top of the building should be the focus in the construction.Compared with the upper-step controlled blasting method,the composite working method could reduce the shock by over 50%.This composite method of upper-step mechanical excavation+middle and lower-step controlled blasting can not only enhance the excavation efficiency but also reduce the vibration effect on the surface buildings to the maximum extent,and it has high promotion and application values.

tunnel engineeringside-crossing buildingshock-absorbing constructionnumerical calculationcontrolled blasting

王智勇

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中国铁路设计集团有限公司,天津 300308

隧道工程 侧穿建筑物 减震工法 数值计算 控制爆破

2024

山西交通科技
山西交通科技信息中心站

山西交通科技

影响因子:0.381
ISSN:1006-3528
年,卷(期):2024.(3)