隧道–土体–地表结构相互作用体系地震响应影响因素分析

doi:10.13722/j.cnki.jrme.2014.1128

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摘要随着城市有限地下空间资源的进一步开发利用，相互穿越工程必将越来越多的涌现。为探讨地下结构近距离穿越地表结构时二者之间地震响应的相互影响规律，本文建立隧道–土体–地表框架结构相互作用体系计算模型，系统研究对该体系地震响应影响显著的参数，具体包括：隧道的直径和埋深、土体的分层特性、框架结构的高宽比及其与隧道圆心的间距、输入地震波特性等。计算分析表明：(1) 隧道对体系自振特性影响并不显著，但地表框架结构则显著改变了体系的频率特征；(2) 隧道对地表框架结构地震响应的影响主要与隧道的半径相关，较大的隧道半径可阻隔地震波的传播，从而起到一定的减震功能；(3) 由于考虑的框架结构质量相对较轻，地表框架结构对隧道地震响应的影响不显著；(4) 由于地震波频谱成分及结构自身频率的影响，不同地震波对体系地震响应的影响十分显著；(5) 土的分层特性改变了土体的刚度，因而也影响了体系的地震响应。本文研究成果可为初步定性确定地下结构与临近地表结构地震响应的相互影响提供参考。

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关键词 ：地震响应, 隧道&ndash, 土体&ndash, 地表结构相互作用体系, 分层土模型, 因素分析

Abstract：More and more crossing projections will appear with the further development and utilization of urban limited underground resources. In order to discuss the mutual influence between underground structure and above structure seismic responses，a tunnel-soil-adjacent frame structure computation model was established and the key influence factors on system seismic responses were studied systematically，which include：tunnel depth and radius，the character of layered soil，the ratio of frame height to width，the distance between frame structure and tunnel center，the characteristics of input seismic waves. The computation results show that：(1) The existence of tunnel almost have no influence on system natural frequencies，while frame structure has a significant influence on system frequency character. (2) The main influence of tunnel on frame structure is come from tunnel radius because the bigger tunnel size can break the propagation of seismic wave and some degree of shock absorption can be achieved. (3) The influence of frame structure on tunnel seismic response is insignificant because the frame structure considered in the paper is too light；(4) The characteristics of input seismic waves have a significant influence on system seismic response because the frequency contents and frequencies of frame structure itself. (5) System seismic responses were influenced greatly under multi-layer soil and one-layer soil because soil stiffness was changed under different soil models. The research results can provide references for preliminary determine the mutual influence on their seismic responses qualitatively.

Key words： Seismic response tunnel-soil-adjacent interaction system multilayer soil model factor analysis

引用本文:

王国波1，王亚西1，陈斌3，于艳丽2. 隧道–土体–地表结构相互作用体系地震响应影响因素分析[J]. 岩石力学与工程学报, 2015, 34(06): 23-23.
WANG Guobo1，WANG Yaxi1，CHEN Bin3，YU Yanli2. ANALYSIS OF INFLUENCING FACTORS ON SEISMIC RESPONSES OF TUNNEL-SOIL-GROUND STRUCTURE INTERACTION SYSTEM. , 2015, 34(06): 23-23.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.1128 或 http://www.rockmech.org/CN/Y2015/V34/I06/23

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