穿越黏滑断层分段接头隧道模型试验研究  

Experimental study of stick-slip fault crossing segmental tunnels with joints

作　　者：闫高明[1] 申玉生[1] 高波[1] 郑清[1] 范凯祥 黄海峰[1] YAN Gao-ming;SHEN Yu-sheng;GAO Bo;ZHENG Qing;FAN Kai-xiang;HUANG Hai-feng(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan 610031,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室

出　　处：《岩土力学》2019年第11期4450-4458,共9页Rock and Soil Mechanics

基　　金：国家自然科学基金项目资助（No.51678501,No.51778540）;“十三五”国家重点研发计划（No.2016YFB1200401）;国家留学基金委（No.201707000044）~~

摘　　要：数次大地震震害调查表明,隧道穿越断层处是受地震破坏较为严重的区域。为此,基于地震动能量的传播与释放特征,建立了一种穿越断层隧道结构抗减震的设计理念,并提出了一种穿越断层隧道节段接头形式。以跨断层龙溪隧道为依托,采用振动台模型试验研究了单一错动方式与断层错动-震动综合加载方式下带有接头的衬砌结构响应。研究结果证明:强震作用下,地震波对穿越断层隧道的影响是不可忽略的,断层错动-震动综合加载方式是合理的;新型接头能够自身适应性变形协调减轻隧道结构震害,节段间接头的设置改变了隧道的变形形态,提高隧道整体抗震能力;同时减小了衬砌的环向破坏,消弱了节段间地震力的传递,实现了衬砌震害的局部化。由于接头的设置,上盘隧道结构震害集中在距断层1.8倍洞径的范围内,下盘处隧道衬砌震害集中在距断层1.2倍洞径范围内;上盘的衬砌震害主要是由错动-震动联合作用造成的,而下盘衬砌震害主要受地震动的影响。Several investigations after earthquake indicate that areas where tunnels cross through faults are damaged severely. For a tunnel running through fault, an anti-seismic design concept is established and a joint of segmental lining is proposed in this paper, based on characteristics of ground motion energy transmission and release. A shaking table test was carried out to study the response of lining structures with joints under single fault movement loading mode, and combined action of normal fault rupture and subsequent seismic shaking based on the Longxi tunnel engineering. The test results show that effect of earthquake wave on the tunnel can not to be ignored, and the loading mode of combined normal fault rupture and subsequent seismic shaking was reasonable. The new joint designed segmental linings could alleviate the tunnel structure damage by self-adaptive deformation, and adjust the longitudinal deformation mode of the tunnel structure to improve the aseismic capability of the whole tunnel lining. Simultaneously the joints could mitigate the circumferential failure of lining, and weaken the seismic force transfer between segments to realize the local damage for tunnel lining. The damage influence length of the tunnel lining located in the hanging wall is 1.8 times of the tunnel span, while the damage influence length of the tunnel lining at the footwall is 1.2 times of the tunnel span. The tunnel damage of the hanging wall is mainly caused by the combined action of the normal fault movement and seismic shaking, while the damage of the lining is mainly affected by the ground motion at footwall.

关 键 词：隧道工程 节段接头 动力响应 断层错动 振动台试验 

分 类 号：U451.5[建筑科学—桥梁与隧道工程]