复杂立交隧道爆破开挖参数设计及动力响应分析

发布时间：2018-06-13 05:48

本文选题：立交隧道 + 光面爆破　；参考：《地下空间与工程学报》2017年S2期

【摘要】：针对双洞平行隧道钻爆法施工上跨多条既有隧道这一复杂施工条件,通过理论计算确定了合理的光面爆破开挖参数,结合现场监测数据对双洞新建隧道上跨爆破施工影响下临近和既有隧道支护结构的震动响应规律进行了研究。结果表明:爆破作用下隧道衬砌结构的迎爆面是最危险面,这一位置的振速较其他位置要高,施工中需要重点监测;爆破冲击荷载作用下的隧道衬砌结构三个方向的振动速度大小不同,但是变化规律基本相同;依据衬砌结构的振速判断其稳定性与安全性时,应采用节点三向振速的合速度;爆破冲击下相邻、相交隧道衬砌结构的最大振速小于规范中的允许值,支护结构处于安全状态,表明爆破施工方案合理可行的。研究成果可以为类似条件下隧道施工提供借鉴。
[Abstract]:In view of the complex construction condition of multiple existing tunnels in the construction of double-hole parallel tunnel by drilling and blasting method, the reasonable parameters of smooth blasting excavation are determined by theoretical calculation. Based on the field monitoring data, the vibration response of adjacent and existing tunnel supporting structures under the influence of blasting construction on the upper span of a new tunnel with two holes is studied. The results show that the blasting face of tunnel lining structure is the most dangerous surface, and the vibration velocity in this position is higher than that in other places. The vibration velocity of the tunnel lining structure under blasting impact load is different in three directions, but the variation law is basically the same, and the combined velocity of the joint three direction vibration velocity should be adopted when judging the stability and safety of the lining structure according to the vibration velocity of the lining structure. The maximum vibration velocity of the intersecting tunnel lining structure is less than the allowable value of the code under the blasting impact, and the supporting structure is in a safe state, which indicates that the blasting construction scheme is reasonable and feasible. The research results can be used for reference for tunnel construction under similar conditions.
【作者单位】：中铁十八局集团隧道工程有限公司;重庆大学土木工程学院;重庆大学山地城镇建设与新技术教育部重点实验室;
【分类号】：U455.6

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