摘要
“5·12”汶川地震过程中,强烈的地震动效应,导致二古溪1……#隧道变形,并出现裂缝等病害。在余震、降水和水库蓄水等诱发因素下,坡体蠕变速率逐渐加剧,坡体出现大变形迹象,从而对坡脚内部二古溪1#隧道造成了强烈的挤压破坏。基于三维激光扫描技术,获取隧道点云影像特征,得到隧道变形量值,测量结果显示隧道最大挤压变形量可达1.08 m。根据变形情况,借助ANSYS有限元计算软件,采用荷载–结构法将衬砌结构离散化,用弹簧来代替围岩的约束作用,从而对结构荷载进行反分析研究。多次重复迭代计算得到坡体深部对衬砌结构荷载大小为：F=16 807-23 737 kN。同时,依据荷载作用的大小,提出有效的隧道处理方案。
During＂5·12＂Wenchuan earthquake,the strong ground motion caused Erguxi tunnel #1 to deform and crack. Under the influences of the aftershocks,the precipitation and the impounding of reservoir etc,the creep rate of the slope gradually increases resulting large deformation of slope and squeezing the Erguxi tunnel #1 to be damaged severely. 3D laser scanning technology was used to obtain the surface image of the tunnels and the tunnel deformation was calculated with the acquired optical results. The maximum extrusion was found to be 1.08 m. The finite element software ANSYS was used to back analyze the structural loads. The element discretization of the lining structure was achieved through the load-structure discrete method with a spring to represent the constraint of rock. Repeated iterations were carried out to get the structural load of the slope on the deep lining to be around：F = 16 807–23 737 kN. A suitable treatment program for the tunnel was put forward based on the value of the load on the structure.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2014年第11期2283-2290,共8页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
三维激光扫描
损伤
反分析
tunnelling engineering
3D laser scanning
damage
back analysis
