摘要
以广东汕湛高速公路水墩隧道为工程背景,运用数值模拟计算方法,分别研究基岩顶板厚度为5,4,3,2,1和0.5 m 6种工况下,隧道爆破施工引起的围岩振动特性及围岩影响域分布特征。研究结果表明:横断面上最大振速出现在距岩层界面最近的隧道轮廓上,纵向上最大振速出现在掌子面后方2 m处,但最危险断面在掌子面后方1 m处,且其位置均不受顶板厚度的影响;当顶板厚度≤4 m时,最危险横断面上影响域开始扩展至上覆软岩,随着顶板厚度进一步减小,影响域参数b和d分别稳定在17 m和5.2 m;当顶板厚度处于0~5 m范围内,可参考相应拟合公式预估影响域范围。
Taking the Shuidun tunnel on Guangdong Shan-Zhan Expressway as an example,the vibration characteristics of surrounding rock caused by tunnel blasting construction and the distribution characteristics of surrounding rock influence area under6working conditions with the bedrock roof thickness of5,4,3,2,1and0.5m were investigated by virtue of numerical simulation.The results show that:the maximum vibration velocity of the cross section appears on the nearest tunnel profile from the rock interface.The longitudinally maximum vibration velocity is at2m behind the tunnel face,but the most disadvantageous section is1m behind the tunnel face,whose position is not affected by the thickness of the roof.When the roof thickness is less than or equal to4m,the most dangerous cross section of the influence area began to expand to the overlying soft rock.With further decrease of the roof thickness,the influence area parameters b and d are stable at17m and5.2m respectively.In the range of0~5m of the thickness of the roof,the influence range can be estimated by referring to the corresponding fitting formula.
作者
邓锷
杨伟超
尹荣申
DENG E;YANG Weichao;YIN Rongshen(School of Civil Engineering, Central South University, Changsha 410075, China;National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2017年第12期2652-2660,共9页
Journal of Railway Science and Engineering
基金
深圳市交委科技计划项目(2016)
关键词
数值模拟
薄基岩顶板
隧道爆破
影响域
numerical simulation
thin roof bedrock
tunnel blasting
influence area
作者简介
通信作者：杨伟超(1978-)，男，河南许昌人，讲师，博士，从事隧道与地下工程方面的教学与科研工作；E-mail：weic_yang@163.com
