狮子坪电站二古溪1~#隧道变形破坏特征及结构荷载反分析研究

发布时间：2018-06-02 00:36

本文选题：隧道工程 + 三维激光扫描　；参考：《岩石力学与工程学报》2014年11期

【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。
[Abstract]:During the "5 12" Wenchuan earthquake, the strong ground motion effect resulted in the deformation of Ergu Xi 1# tunnel and the occurrence of cracks and other diseases. Under the induced factors such as aftershocks, precipitation and reservoir water storage, the creep rate of the slope body increases gradually, and the slope body shows the signs of large deformation, which causes a strong crush damage to the Ergu Xi1# tunnel inside the slope foot. Based on the 3D laser scanning technique, the tunnel point cloud image features are obtained, and the tunnel deformation value is obtained. The measurement results show that the maximum extrusion deformation of the tunnel can reach 1.08 m. According to the deformation situation, the lining structure is discretized by using the ANSYS finite element calculation software, and the spring is used to replace the constraint action of surrounding rock, so the back analysis of the structural load is carried out. Repeated iterative calculations show that the load on the lining structure in the deep part of the slope is 1: F ~ (16) 807 ~ (7) ~ (23) 737 KN. At the same time, according to the magnitude of load, an effective tunnel treatment scheme is proposed.
【作者单位】：四川大学水力学及山区河流开发与保护国家重点实验室;中国电建集团成都勘测设计院有限公司;成都理工大学地质灾害防治与地质环境保护国家重点实验室;
【分类号】：U457

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