双向地震作用下跨断层破碎带隧道地震响应动力学试验研究  

Dynamic experimental study on seismic response of cross fault fractured zone tunnels under bidirectional seismic action

作　　者：陶志刚[1,2] 赵易 丰于翔 张晓宇[1,2] 何满潮[1,2] 毛玉铤 TAO Zhigang;ZHAO Yi;FENG Yuxiang;ZHANG Xiaoyu;HE Manchao;MAO Yuting(National Key Laboratory of Disaster Prevention and Control and Intelligent Maintenance of Tunnel Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)隧道工程灾变防控与智能建养全国重点实验室,北京100083 [2]中国矿业大学(北京)力学与土木工程学院,北京100083

出　　处：《中南大学学报(自然科学版)》2025年第2期637-650,共14页Journal of Central South University:Science and Technology

基　　金：第二次青藏高原综合科学考察研究资助项目(2019QZKK0708)。

摘　　要：通过开展大型振动台试验,研究NPR锚索支护及跨断层破碎带隧道在水平和竖向地震作用下的围岩、隧道结构、锚索的动力响应及破坏规律。研究结果表明:破碎带对地震波具有明显的放大效应,且围岩条件越差,地震响应越明显;在双向地震作用下,模型围岩的加速度响应随埋深的增大而减小,在地基深处,Z向地震波响应显著,浅层X向地震波响应显著;在双向地震反复拉压作用下,隧道拱顶处主要受Z向地震作用影响、拱腰处主要受X向地震作用影响、拱肩处主要受XZ双向地震作用影响,因此,隧道结构在地震作用下表现出“拱肩—拱腰—拱顶”的破坏发展机制;地震作用后,隧道拱肩处产生大变形破坏,但并未发生坍塌,说明NPR锚索具有较大变形量及较强的对灾变围岩的保持能力。Through conducting large-scale shaking table tests,the dynamic responses and failure laws of surrounding rocks,tunnel structures,and NPR anchor cables of tunnels crossing fault fracture zones under the support of NPR anchor cables and horizontal and vertical seismic actions were studied.The results show that the fracture zone has an obvious amplification effect on seismic waves,and the worse the surrounding rock conditions are,the more obvious the seismic response is.Under the action of two-way earthquakes,the acceleration response of the model surrounding rock decreases with the increase of burial depth.At the deep foundation,the Z direction seismic wave response is significant,and the shallow X-direction seismic wave response is significant.Under the repeated tension and compression of two-way earthquakes,the vault of the tunnel is mainly affected by the Z-direction seismic action,the haunch of the tunnel is mainly affected by the X-direction seismic action,and the spandrel of the tunnel is mainly affected by the XZ two-way seismic action.Therefore,the tunnel structure shows a failure development mechanism of"spandrel-haunch-vault"under seismic action.After the seismic action,large deformation damage occurs at the spandrel of the tunnel,but no collapse occurs,indicating the large deformation performance of NPR anchor cables and their retaining ability for disaster-prone surrounding rocks.

关 键 词：地震响应 振动台试验 NPR锚索 双向地震 

分 类 号：U451.5[建筑科学—桥梁与隧道工程]