期刊 隧道的两种减震措施研究  被引量:73

STUDY OF TWO SHOCK ABSORPTION MEASURES IN TUNNEL

作  者:高峰[1] 石玉成[2] 严松宏[1] 关宝树[3] 

机构地区:[1]兰州交通大学土木工程系 [2]中国地震局兰州地震研究所 [3]西南交通大学

出  处:《岩石力学与工程学报》2005年第2期222-229,共8页Chinese Journal of Rock Mechanics and Engineering

STUDY OF TWO SHOCK ABSORPTION MEASURES IN TUNNEL

基  金:国家社会公益研究专项基金资助项目(2002DIB20062);兰州交通大学"青蓝"人才工程基金资助项目

摘  要:运用 Newmark 隐式时间积分有限元法并采用粘–弹性人工边界,计算了不同地震动作用下不同的围岩材料对隧道地震反应的影响,并通过改变隧道衬砌一定范围内围岩材料的参数,计算了隧道的地震反应,分析了在隧道施工中设置减震层和注浆加固一定范围内围岩这两种方法的减震效果、适用条件及其减震机理。计算结果表明:减震层或加固层的设置使隧道衬砌位移差减小,从而使其应力减小,起到保护隧道衬砌的作用;对于处于软弱围岩中的隧道,可以采用在较大的范围内注浆加固围岩的办法进行减震,充分发挥围岩的承载能力;而处于稳定性极好的坚硬围岩中的地下结构,可不考虑抗震问题,即使是处于强震区,只是对于重要的建筑物才采用设置减震层的方法进行减震。计算结果可为地下结构的抗震设计提供了依据。

Based on Newmark's step-by-step implicit integration FEM method, the response analyses of a generic tunnel by using viscous-spring artificial boundary technique under various earthquake accelerations and multiform conditions of surrounding rocks are presented. The seismic responses of the tunnel are calculated by changing parameters of surrounding rocks within certain influencing distances to the linings. Two kinds of shock absorption measures, which are setting shock layer and grouting in the surrounding rock, are investigated. The shock absorption effects, applicability, and shock mechanisms are analyzed. The results show that the differential displacements and stresses in the lining of the tunnel decrease and the linings are protected when the two measures are used. It also shows that for weak surrounding rocks, rock grouting is an effective shock absorption measure and the aseismatic capability of surrounding rocks can be improved. For underground structures in hard rocks, the seismic effects on tunnel stability can be ignored even if tunnel is located in earthquake-prone regions, but for important projects. The results provide useful reference for the aseismatic design of tunnel.

关 键 词:隧道工程 减震原理 结构动力分析 粘-弹性边界 有限元方法 

Finite element method Grouting Seismic waves Tunnels 

分 类 号:TU311.3[建筑科学—结构工程]

 

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