高地震区公路隧道地震动力响应分析   总被引：2，自引：0，他引：2  

朱长安  高波  索然绪 《岩土工程技术》2008,22(5):232-235

基于土一结构相互作用理论,对高地震区一实际重大工程的公路隧道洞口段结构进行了抗震计算,得到了衬砌结构各控制点的位移、加速度及内力响应规律。结果表明：在人工合成地震波条件下,衬砌墙脚、拱腰为抗震薄弱位置;结构的加速度波形与输入波形相似;这些结果为抗震设计提供了一些依据。  相似文献   

地下圆形衬砌隧道对沿线地震动的影响(II):数值结果   总被引：5，自引：3，他引：5  

梁建文  纪晓东  Vincent W Lee 《岩土力学》2005,26(5):687-692

利用地下圆形衬砌隧道对入射平面P波和SV波散射级数解答，定量分析了入射波长、入射角度、隧道直径、衬砌刚度等因素对沿线地表位移放大作用的影响。计算结果表明，当入射频率较低时，地下隧道的存在对地表位移幅值影响不大；而当入射频率较高时，地表位移幅值可以达到无隧道情况的4．5倍以上；衬砌情况下地表位移幅值可以高出非衬砌情况的87．8％。建议在地铁的规划设计中考虑地下隧道的建设对隧道沿线设计地震动的影响。  相似文献   

大风垭口公路隧道施工中的地质灾害及对策     

于宁  朱合华  苏生瑞 《地质灾害与环境保护》2003,14(2):21-26

公路隧道的施工过程经常会碰到地质灾害，本文结合云南元磨高速公路在建特长隧道-大风垭口隧道中出现的洞口滑坡、涌水、塌方、突泥等问题，多角度论述了产生的因素以及应对措施，希望能为今后在类似地质条件下，公路隧道的勘查、设计以及施工提供借鉴和帮助。  相似文献   

A Physical and Numerical Investigation on the Stability of Shallow Tunnels in Strain Softening Media   总被引：11，自引：0，他引：11  

D. Sterpi  A. Cividini 《Rock Mechanics and Rock Engineering》2004,37(4):277-298

Summary The behaviour up to failure of shallow underground openings is discussed on the basis of some laboratory, small-scale model tests and of finite element simulation. The experimental results are first illustrated. They were obtained from two-dimensional (plane strain) and three-dimensional tunnel models tested under standard gravity conditions. Then, the phenomenon of strain localisation that characterizes the medium surrounding the model tunnels is discussed, recalling two alternative approaches for its numerical interpretation. On this basis, a finite element procedure for strain softening analyses is outlined and applied to the simulation of the tests in both two- and three-dimensional conditions. The comparison between experimental and numerical results leads to some conclusions on the influence of strain localisation on the overall behaviour of shallow tunnels and on the stability of their headings.  相似文献   

An analytical solution for deforming twin‐parallel tunnels in an elastic half plane          下载免费PDF全文

Jinyang Fu  Junsheng Yang  Li Yan  Syed Muntazir Abbas 《国际地质力学数值与分析法杂志》2015,39(5):524-538

The interaction between twin‐parallel tunnels affects the tunnelling‐induced ground deformation, which may endanger the nearby structures. In this paper, an analytical solution is presented for problems in determining displacements and stresses around deforming twin‐parallel tunnels in an elastic half plane, on the basis of complex variable theory. As an example, a uniform radial displacement was assumed as the boundary condition for each of the two tunnels. Special attention was paid to the effects of tunnel depth and spacing between the two tunnels on the surface movement to gain deep insight into the effect of the interaction between twin‐parallel tunnels using the proposed analytical approach. It is revealed that the influence of twin tunnel interaction on surface movements diminishes with both the increase of the tunnel depth and the spacing between the two tunnels. The presented analytical solution manifests that, similar to most of the existing numerical results, the principle of superposition can be applied to determine ground deformation of twin‐parallel tunnels with a certain large depth and spacing; otherwise, the interaction effect between the two tunnels should be taken into account for predicting reliable ground movement. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

二郎山公路隧道轴线地应力测试研究     

王成绪 《煤田地质与勘探》1998,(Z1)

介绍了二郎山公路隧道轴线上3个钻孔的地应力测试结果,应用水压致裂法在钻孔中测试,所测的两个不同大小的水平主应力都大于垂直主应力（除了地表以下很浅处外）,这个地应力与区域大地构造方向一致,在此基础上评价了隧道碉室围岩的稳定性。  相似文献   

大断面小净距大帽山隧道现场监控量测及分析   总被引：10，自引：0，他引：10  

张国华  陈礼彪  钱师雄  蔡光远  吴超凡  李祺 《岩土力学》2010,31(2):489-496

结合大帽山隧道的工程实践,通过围岩内部位移、拱顶沉降、围岩压力和锚杆应力的现场监控量测工作,研究复杂地质条件下大断面小净距隧道双侧壁导坑法施工时围岩的稳定性。阐明分导洞开挖时围岩内部位移的变化趋势、特点及位移场,相邻导洞施工时的相互影响,围岩与支护结构间的相互调整变形机制,拱顶沉降捕捉的变形小于围岩实际变形的原因,支护结构的压力和锚杆应力状态及其与围岩位移的变化关系。监测结果表明,大断面小净距隧道Ⅴ级围岩段的破碎带采用现有的施工工艺和支护参数是可行的,围岩变形可控,支护结构的支护效果显著,围岩基本稳定。研究的方法、分析和结论可为类似条件下隧道工程的设计、施工、监测和进一步的理论研究提供参考和借鉴。  相似文献   

Three‐dimensional finite element analysis of the interaction between tunneling and pile foundations     

H. Mroueh  I. Shahrour 《国际地质力学数值与分析法杂志》2002,26(3):217-230

This paper concerns analysis of the impact of construction of urban tunnels on adjacent pile foundations. It is carried out using an elastoplastic three‐dimensional finite element modelling. Numerical simulations are performed in two stages, which concern, respectively, the application of the pile axial loading and the construction of the tunnel in presence of the pile foundations. Analysis is carried out for both single piles and groups of piles. Results of numerical simulations show that tunneling induces significant internal forces in adjacent piles. The distribution of internal forces depends mainly on the position of the pile tip regarding the tunnel horizontal axis and the distance of the pile axis from the centre of the tunnel. Analysis of the interaction between tunneling and a group of piles reveals a positive group effect with a high reduction of the internal forces in rear piles. Copyright © 2002 John Wiley & Sons, Ltd.  相似文献   

Extrusion movements of a tunnel head reinforced by finite length bolts—a closed‐form solution using homogenization approach     

Henry Wong  Didier Subrin  Daniel Dias 《国际地质力学数值与分析法杂志》2000,24(6):533-565

An analytical model on the general behaviour of a tunnel head, reinforced by finite length bolts is proposed. This model is based on the homogenization method and spherical symmetry assumption. Despite its simplicity, and in consequence its limits of validity, it does allow a quick estimation of the key design parameters: frontal displacement, extension of decompressed zone, ground stresses and bolt tension, and constitutes thereby a very useful and handy tool for design engineers. In particular, the influence of the reinforcement length, as well as other important design parameters, are studied by the proposed model. The charts resulting from the parametric studies are directly applicable. Otherwise, the comparison to a 3D numerical model is also presented in this paper. The first results provide the validation of the analytical solution, at least in terms of average extrusion movements. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

SH波水平入射穿越垂直断层隧道动力响应分析     

杜修力  苏驰翔  黄景琦  王媛  赵密  欧阳文龙 《震灾防御技术》2019,14(2):269-280

结合黏弹性人工边界的时域波动输入方法和显式有限元法,设计了含垂直断层三维场地的SH波输入方法。基于建立的输入方法,研究了垂直断层对隧道地震响应的影响,并通过自由场算例验证了该方法具有较好精度。数值模拟结果表明:对于断层迎波侧的隧道结构,断层会对其地震动响应产生显著的放大作用,对于断层逆波侧的隧道结构,断层会对其产生隔离地震动的作用;相对周围围岩,断层介质的剪切波速越小,其产生的放大效应和隔震效果也会越显著;断层宽度越小,其对隧道地震动响应的影响范围也就越小,但是断层宽度的变化对于断层两侧隧道的地震动响应的影响并不明显。  相似文献