穿断层隧道NPR锚索支护体系抗震特性振动台试验研究  

Shaking table test on anti-seismic characteristics of NPR anchor cable support system for tunnel crossing faults

作　　者：陶志刚[1,2] 丰于翔 赵易 张晓宇[1,2] 何满潮[1,2] 雷啸天 TAO Zhi-gang;FENG Yu-xiang;ZHAO Yi;ZHANG Xiao-yu;HE Man-chao;LEI Xiao-tian(State Key Laboratory for Geomechanics and Deep Underground 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)深部岩土力学与地下工程国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《岩土力学》2024年第4期939-949,共11页Rock and Soil Mechanics

基　　金：国家自然科学基金专项项目(No.41941018);深部岩土力学与地下工程国家重点实验室创新基金项目(No.SKLGDUEK202201)。

摘　　要：为研究具有负泊松比效应(negative Poisson’s ratio,NPR)的恒阻大变形锚索在地震作用下的吸能特性与动力响应规律,利用振动台开展含断层隧道使用普通锚索支护以及使用NPR锚索支护的振动台物理模型试验,对比分析地震作用下处于不同围岩条件中以及使用不同锚索进行支护时隧道结构的动力响应规律。研究结果表明:在同一地震波作用下,使用NPR锚索进行支护的隧道结构破坏程度与使用普通锚索进行支护的隧道结构相比有明显的改善,表明NPR锚索在地震作用下具有良好的吸能特性,能够为隧道结构提供有效支护;通过对比分析普通锚索与NPR锚索的锚索轴力时程曲线可知,在地震波作用下,普通锚索会发生破断现象,轴力突降至零,而NPR锚索的高恒阻力能够持续提供有效支护;分析隧道结构各测点的加速度、应变、土压力等动力响应可知,隧道断层区域在地震作用下的动力响应更为明显,隧道结构在地震作用下呈现出拱肩→拱腰→拱顶的破坏规律,这一研究成果为类似隧道工程的支护对策提供了理论参考。In order to study the energy absorption characteristics and dynamic response rule of constant resistance and large deformation with negative Poisson’s ratio(NPR)anchor cable under the action of earthquake,the physical model test on the tunnel passing through a fault supported by common anchor cable and NPR anchor cable was carried out by using the shaking table test.The dynamic response rule of tunnel structure under different surrounding rock conditions and supported by different anchor cables under the action of earthquake was compared and analyzed.The results show that the damage degree of tunnel structure supported by NPR cable is significantly improved compared with that supported by common cable under the same seismic wave.This suggests that NPR cable has good energy absorption characteristics and can provide effective support for tunnel structure under earthquake.By comparing and analyzing the time-history curves of axial force of common cable and NPR cable,it is evident that under the action of seismic waves,the common cable will break and the axial force will drop to zero,while the high constant resistance of NPR cable can continue to provide effective support.By analyzing the dynamic response of acceleration,strain and earth pressure at each measuring point of the tunnel structure,it can be seen that the dynamic response of the tunnel fault area is more obvious,and the tunnel structure fails in the sequence of arch spandrel→haunch→crown under the action of earthquake.This research achievement provides a theoretical reference for support strategies in tunnel engineering.

关 键 词：振动台试验 隧道支护 NPR锚索 地震响应 

分 类 号：TU452[建筑科学—岩土工程]