爆破振动对邻近铁路隧道衬砌结构的影响  

Effect of Blasting Vibration on Lining Structure of Adjacent Railway Tunnel

作　　者：郭云龙 时步炯 孟海利 孙崔源 薛里 GUO Yunlong;SHI Bujiong;MENG Haili;SUN Cuiyuan;XUE Li(Railway Engineering Research Institute,CARS,Beijing 100081,China;Hangzhou Railway Terminal Project Construction Headquarters,China Railway Shanghai Group Corporation Limited,Hangzhou 310000,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [2]中国铁路上海局集团有限公司杭州铁路枢纽工程建设指挥部,杭州310000

出　　处：《铁道建筑》2023年第9期105-110,共6页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2022YJ087)。

摘　　要：依托海南西环铁路新建隧道爆破工程,选择三角形等效爆破荷载模拟爆破过程。结合现场爆破振动监测,验证隧道爆破三维模型的准确性。进而逐级提高爆破荷载,分析5、10、15、20、25倍五种爆破荷载工况下,隧道围岩塑性区分布情况、既有铁路隧道衬砌结构的爆破振动速度和拉应力变化规律。结果表明:新建隧道爆破开挖时,既有隧道衬砌结构迎爆侧拱肩爆破振动合速度最大,仰拱一直处于受拉状态;随着爆破荷载不断提高,隧道围岩塑性区范围不断扩大,既有隧道衬砌结构最大爆破振动速度和最大拉应力均不断增大;当采用20倍爆破荷载作用时,既有隧道衬砌结构迎爆侧边墙最大爆破振动速度为29.90 cm/s。Based on the new tunnel blasting project of Hainan west ring railway,the accuracy of 3D model of tunnel blasting was verified through combining the triangular equivalent blasting load selected to simulate the blasting process and on-site blasting vibration monitoring.Then,the plastic zone distribution of the tunnel surrounding rock,the variation law of blasting vibration speed and tensile stress of the existing railway tunnel lining structure under the five blasting load conditions of 5,10,15,20 and 25 times were analyzed,respectively.The results show that during the blasting excavation of a new tunnel,the maximum combined vibration velocity facing the blasting side occurs at the arch shoulder,and the invert remains in a tensile state.With the continuous increase of blasting load,the plastic zone scope of tunnel surrounding rock continues to expand,and the maximum blasting vibration velocity and maximum tensile stress of the existing tunnel lining structure continue to increase.When 20 times the blasting load is applied,the maximum blasting vibration velocity of the sidewall facing the blasting side of the lining structure of the existing tunnel is 29.90 cm/s.

关 键 词：铁道隧道 工程爆破 数值模拟 爆破振动 拉应力 隧道衬砌 塑性区 衬砌混凝土 

分 类 号：U455.41[建筑科学—桥梁与隧道工程]