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Transactions of Tianjin University 2018年第3期24卷 290-300页

作者： Haitao Zhu Tianjiao Tang Puyang Zhang Jianqiao Sun School of Civil Engineering Tianjin University Key Laboratory of Coast Civil Structure Safety of Ministry of Education Tianjin University School of Engineering University of CaliforniaMerced

In this paper, the verticalseismic effects on tunnels are studied based on a classic mass–damper–spring model. An analyticaldiscrete modelof urban underground tunnels subjected to verticalearthquake excitations is proposed by considering the first verticalvibration mode. Taking a light railproject in Tianjin as an example, this study uses the proposed discrete modelto analyze the displacements of tunneland soilunder verticalearthquake excitations. The soildisplacement responses at different tunnellocations are analyzed with linear random vibration *** computationalcost is greatly reduced using the proposed model. It can be seen that different from the case of horizontalearthquakes, the displacement responses under verticalearthquake excitations keep growing after seismic acceleration reaches its peak for a short duration, and then,they begin to decay. The soils at different positions around the tunnels have large relative displacement under verticalearthquake excitations. Moreover, a finite-element modelis also established for displacement responses using *** comparison with the results of the finite-element modelshows that the results of the proposed discrete modelare available.

关键词： underground tunnel Vertical seismic action Mass-damper-spring model Random vibration

Longitudinal integral response deformation method for the seismic analysis of a tunnel structure

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Earthquake Engineering and Engineering Vibration 2021年第4期20卷 887-904页

作者： Liu Jingbo Wang Dongyang Bao Xin Department of Civil Engineering Tsinghua UniversityBeijing 100084China

For the longitudinal seismic response analysis of a tunnel structure under asynchronous earthquake excitations,a longitudinal integral response deformation method classified as a practical approach is proposed in this *** determinations of the structural critical moments when maximal deformations and internal forces in the longitudinal direction occur are deduced as *** applying the proposed method,the static analysis of the free-field computation model subjected to the least favorable free-field deformation at the tunnel buried depth is performed first to calculate the equivalent input seismic ***,the equivalent input seismic loads are imposed on the integral tunnel-foundation computation model to conduct the static ***,the critical longitudinal seismic responses of the tunnel are *** applicability of the new method is verified by comparing the seismic responses of a shield tunnel structure in Beijing,determined by the proposed procedure and by a dynamic time-history analysis under a series of obliquely incident out-of-plane and in-plane *** results show that the proposed method has a clear concept with high accuracy and simple ***,this method provides a feasible way to determine the critical moments of the longitudinal seismic responses of a tunnel ***,the proposed method can be effectively applied to analyze the seismic response of a long-line underground structure subjected to non-uniform excitations.

关键词： underground tunnel longitudinal integral response deformation method asynchronous seismic excitation critical moment

Dynamic soil-tunnel interaction in layered half-space for incident plane SH waves

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Earthquake Engineering and Engineering Vibration 2016年第4期15卷 715-727页

作者： Fu Jia Liang Jianwen Qin Lin State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin University Department of Civil Engineering Tianjin University

The dynamic soil-tunnel interaction is studied by indirect boundary element method （IBEM）, using the model of a rigid tunnel in layered half-space, which is simplified to a single soil layer on elastic bedrock, subjected to incident plane SH waves. The accuracy of the results is verified through comparison with the analytical solution. It is shown that soil-tunnel interaction in layered half-space is larger than that in homogeneous half-space and this interaction mechanism is essentially different from that of soil-foundation-superstructure interaction.

关键词： underground tunnel layered half-space plane SH wave indirect boundary element method soil-tunnel interaction site dynamic characteristics

Antiplane SH-deformations near a surface rigid foundation above a subsurface rigid circular tunnel

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Earthquake Engineering and Engineering Vibration 2002年第1期1卷 27-35页

作者： V.W.Lee M.E.Manoogian S.Chen Civil & Envir.Eng.Dept. Univ.of Southern CaliforniaLos AngelesCaliforniaU.S.A.Associate Professor Civil Eng.& Envir:Sci.Dept. Loyola Marymount Univ.Los AngelesCaliforniaU.S.A.Associate Professor Civil & Envir.Eng.Dept. Univ.of Southern CaliforniaLos AngelesCaliforniaU.S.A. Research Associate

The problem on the dynamic response of a rigid embedded foundation in the presence of an underground rigid tunnel and subjected to excitation of incident anti-plane SH waves is *** using the exact analytical solution for the two-dimensional SH-wave propagation in and around both the surface rigid foundation and subsurface rigid tunnel,those aspects of the resulting ground motions that are of special interest and importance for seismic resistant design in earthquake analyses have been *** computed amplitudes of the resulting periodic ground motions display a very complicated wave-interference between the surface foundation and underground tunnel that lead to observed standing wave patterns, together with abrupt changes in the wave amplitudes and large amplification of the incident motions.

关键词： SH waves wave-interference embedded foundation underground tunnel analytical solution

Dynamic soil-tunnel interaction in layered half-space for incident P-and SV-waves

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Earthquake Science 2015年第4期28卷 275-284页

作者： Jia Fu Jianwen Liang Lin Qin Department of Civil Engineering Tianjin University Tianjin Key Laboratory of Civil Engineering Structures & New Materials

The dynamic soil-tunnel interaction is studied by the model of a rigid tunnel embedded in layered half-space, which is simplified as a single soil layer on elastic bedrock to the excitation of P- and SV-waves. The indirect boundary element method is used, combined with the Green＇ s function of distributed loads acting on inclined lines. It is shown that the dynamic characteristics of soil-tunnel interaction in layered half-space are different much from that in homoge- neous half-space, and that the mechanism of soil-tunnel interaction is also different much from that of soil-founda- tion-superstructure interaction. For oblique incidence, the tunnel response for in-plane incident SV-waves is com- pletely different from that for incident SH-waves, while the tunnel response for vertically incident SV-wave is very similar to that of vertically incident SH-wave.

关键词： underground tunnel Layered half-space P-wave and SV-wave Indirect boundary element method Soil-tunnel interaction ~ Site dynamic characteristics

Seismic isolation effect of lined circular tunnels with damping treatments

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Earthquake Engineering and Engineering Vibration 2008年第3期7卷 305-319页

作者： Seyyed M. Hasheminejad Amir K. Miri Acoustics Research Laboratory Department of Mechanical Engineering Iran University of Science and Technology Narmak Tehran 16844 Iran

The Havriliak-Negami model for dynamic viscoelastic material behavior and Biot＇s theory of poroelasticity are employed to develop an exact solution for three-dimensional scattering effect of harmonic plane P-SV waves from a circular cavity lined with a multilayered fluid-filled shell of infinite length containing viscoelastic damping materials and embedded within a fluid-saturated permeable surrounding soil medium. The analytical results are illustrated with numerical examples where the effects of liner/coating structural arrangement, viscoelastic material properties, liner-soil interface bonding condition, seismic excitation frequency, and angle of incidence on the induced dynamic stress concentrations are evaluated and discussed to obtain representative values of the parameters that characterize the system. It is demonstrated that incorporating viscoelastic damping materials with a low shear modulus in the constrained layer configuration is an efficient means of enhancing the overall seismic isolation performance, especially for near-normally incident seismic shear waves where the amplitudes of induced dynamic stresses may be reduced by up to one-third of those without isolation in a relatively wide frequency range. Some additional cases are considered and good agreements with solutions available in the literature are obtained.

关键词： underground tunnel permeable soil seismic wave scattering flee/constrained layer damping

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中国地道战:蜿蜒在平原地底的万里长城

Quantitative analysis of rockburst for surrounding rocks and zonal disintegration mechanism in deep tunnels

环球人文地理 2011年第7期 12-23页

作者：余兴伟

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Journal of Rock Mechanics and Geotechnical Engineering 2011年第1期3卷 1-9页

作者： Qihu Qian1,Xiaoping Zhou2 1 Engineering Institute of Engineering Corps,PLA University of Science and Technology,Nanjing,210007,China 2 School of Civil Engineering,Chongqing University,Chongqing,400045,China Engineering Institute of Engineering Corps PLA University of Science and Technology Nanjing 210007 China School of Civil Engineering Chongqing University Chongqing 400045 China

Rock masses without pre-existing macrocracks can usually be considered as granular materials with only *** the excavation of the tunnels,microcracks may nucleate,grow and propagate through the rock matrix;secondary microcracks may appear,and discontinuous and incompatible deformation of rock masses may *** classical continuum elastoplastic theory is not suitable for analyzing discontinuous and incompatible deformation of rock *** on non-Euclidean model of the discontinuous and incompatible deformation of rock masses,the distribution of stresses in the surrounding rock masses in deep tunnels is fluctuant or *** stress concentration at the tips of microcracks located in vicinity of stress wave crest is comparatively large,which may lead to the unstable growth and coalescence of secondary microcracks,and consequently the occurrence of fractured *** the other hand,the stress concentration at the tips of microcracks located around stress wave trough is relatively small,which may lead to the arrest of microcracks,and thus the non-fractured *** alternate appearance of stress wave crest and trough thus may induce the alternate occurrence of fractured and non-fractured zones in deep rock *** brittle rocks,the dissipated energy of microcrack growth is small,but the elastic strain energy stored in rock masses may be larger than the dissipated energy growths of pre-existing microcracks and secondary *** sudden release of the residual elastic strain energy may lead to *** on this understanding,the criteria of rockburst are ***,the relationship between rockbursts and zonal disintegration in the surrounding rock masses around deep tunnels is *** influences of the in-situ stresses and the physico-mechanical parameters on the distribution of rockburst zones and the ejection velocity of rock fragments are investigated in detail.

关键词： underground tunnel rockburst zonal disintegration non-Euclidean model