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“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 the May 12 Wenchuan earthquake, strong ground motion resulted in the deformation of No. 1 tunnel in Erluo Creek and the occurrence of cracks and other diseases. Under the aftershocks, precipitation and reservoir water storage, the creep rate of slope gradually aggravated and the deformation of the slope showed signs of large deformation, which resulted in strong crushing failure on No. 1 tunnel of Er Gu Gu Xi within the slope foot. Based on the 3D laser scanning technology, the tunnel point cloud image characteristics were obtained and the tunnel deformation values were obtained. The measured results show that the maximum crushing deformation of the tunnel can reach 1.08 m. According to the deformation, using ANSYS finite element software, the load-structure method is used to discretize the lining structure, and the spring is used to replace the constraint of the surrounding rock so as to inversely analyze the structural load. Repeated iterative calculation of slope load to the deep structure of the load size: F = 16 807 ~ 23 737 kN. At the same time, according to the size of the load, proposed an effective tunnel treatment program.