等效荷载法在超大断面公路隧道爆破数值计算中的适用性  

Applicability of Equivalent Load Method in Numerical Calculation of Blasting of Super Large Section Highway Tunnel

作　　者：孟祥林 汪洋 高进 晏启祥[1] 郭治岳 MENG Xiang-lin;WANG Yang;GAO Jin;YAN Qi-xiang;GUO Zhi-yue(Key Laboratory of Transportation Tunnel Engineering,Southwest Jiaotong University,Chengdu 610031,China;Chengdu Construction Engineering Corporation Group Road and Bridge Company Limited,Chengdu 610091,China;Sichuan Transportation Survey,Design and Research Institute Co.,Ltd.,Chengdu 610017,China)

机构地区：[1]西南交通大学,交通隧道工程教育部重点实验室,成都610031 [2]成都建工路桥建设有限公司,成都610091 [3]四川省交通勘察设计研究院有限公司,成都610017

出　　处：《科学技术与工程》2023年第31期13582-13591,共10页Science Technology and Engineering

基　　金：国家自然科学基金(52278416)。

摘　　要：为了探究选取最优的计算方法研究超大断面公路隧道爆破施工对先后行隧道的影响,分别采用流固耦合法、初始体积分数法和等效荷载法建立单孔爆破有限元模型模拟单孔耦合装药情况下的爆破过程,从岩体破碎效果、计算效率等方面对比选定等效荷载法为最优的计算方法,并建立隧道数值模型应用等效荷载法计算研究后行隧道爆破对先后行隧道结构的影响。结果表明:①后行隧道爆破施工时先行隧道综合振速显著区域出现在隧道掘进方向上,逆隧道掘进方向隧道衬砌动力响应程度较小;②先行隧道受影响最大位置为迎爆侧右边墙,影响最小位置出现在背爆侧左拱脚;③后行隧道监测断面振速最大值出现在左拱腰位置,施工时要重点监测。In order to explore and select the optimal calculation method to research the influence of blasting construction of super-large cross-section highway tunnels on successive tunnels,the fluid-solid coupling method,initial volume fraction method and equivalent load method were used to establish a single-hole blasting finite element model to simulate the blasting process under the condition of single-hole coupling charge.The equivalent load method was selected as the optimal calculation method from the aspects of rock mass crushing effect and calculation efficiency,and the tunnel numerical model was established to calculate and research the influence of subsequent tunnel blasting on the structure of successive tunnels by using the equivalent load method.The results show these as follows.During the blasting construction of the backward tunnel,the area with significant comprehensive vibration velocity of the preceding tunnel appears in the direction of tunnel excavation,and the degree of dynamic response of the tunnel lining in the reverse direction of tunnel excavation is small.The most affected position of the leading tunnel is the right wall on the blasting side,the minimum impact position appears at the left arch foot on the back burst side.The maximum vibration velocity of the rearward tunnel monitoring section appears at the left arch waist position,which should be monitored during construction.

关 键 词：超大断面公路隧道 等效荷载法 数值计算 单孔爆破 流固耦合法 初始体积分数法 动力响应 

分 类 号：U455.6[建筑科学—桥梁与隧道工程]