| 侧压力系数对马蹄形隧道损伤破坏的影响研究 |
| |
| 引用本文： | 李占海,朱万成,冯夏庭,李绍军,周 辉,陈炳瑞.侧压力系数对马蹄形隧道损伤破坏的影响研究[J].岩土力学,2010,31(Z2):434-441. |
| |
| 作者姓名： | 李占海 朱万成 冯夏庭 李绍军 周 辉 陈炳瑞 |
| |
| 作者单位： | 1. 东北大学 资源与土木工程学院，沈阳，110004；2. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071 |
| |
| 基金项目： | 973项目（No. 2010CB732006）资助。 |
| |
| 摘 要： | 数值模拟研究了马蹄形隧道在不同载荷下从围岩初始损伤至失稳破坏的破坏过程,分析了侧压力系数λ对隧道的初始损伤、拱顶位移、围岩应力分布特征和围岩损伤破坏模式的影响,研究结果表明,损伤机制与λ密切相关,当λ较小时,在空间上初始损伤分布具有较大的离散性,以拱脚、拱肩和拱顶位置为主;当λ较大时,初始损伤以拱顶的拉伸损伤位置为主;拱顶垂直方向的位移随λ的增大而减小,且随埋深的增加而增大;隧道围岩的最大和最小主应力随λ的增大而增大,隧道围岩应力分布和应力集中程度受隧道形状的影响显著,在一定范围内,隧道形状比离自由面的距离作用机制更为强烈;在破裂模式上,当λ较小时,裂纹以垂直方向开裂为主,随着λ的增大转变为以水平方向开裂为主。
|
| 关 键 词： | 马蹄形隧道 侧压力系数 损伤破坏 稳定性 数值模拟 |
| 收稿时间： | 2010-11-27 |
Effect of lateral pressure coefficients on damage and failure process of horseshoe-shaped tunnel |
| |
| LI Zhan-hai,ZHU Wan-cheng,FENG Xia-ting,LI Shao-jun,ZHOU Hui,CHEN Bing-rui.Effect of lateral pressure coefficients on damage and failure process of horseshoe-shaped tunnel[J].Rock and Soil Mechanics,2010,31(Z2):434-441. |
| |
| Authors: | LI Zhan-hai ZHU Wan-cheng FENG Xia-ting LI Shao-jun ZHOU Hui CHEN Bing-rui |
| |
| Institution: | 1. School of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
| |
| Abstract: | The failure process of horseshoe-shaped tunnel under different lateral pressure coefficients is numerically simulated, based on which, the effect of the lateral pressure coefficient on the initiator damage, displacement at roof, stress distribution, and the failure modes around the tunnel are examined. The numerical results indicate: Damage mechanism is mainly controlled by the lateral pressure coefficient , i.e. when ≤1, the position of damage initiation is largely discrete, especially at arch foot, spandrel and tunnel roof; when >1, however, spandrel is seriously damaged, vertical displacement of vault increases with the decreasing and increasing depth. The stress σ1 and σ3 increase with , even though the stress concentration at different parts of tunnel is quite different. Within a certain distance, the mechanism of the tunnel shape has more intensive influences than the distance from free tunnel perimeter. For the failure mode, when is relatively small, the main cracks spread in the vertical direction, while with the increase of , cracks gradually spread in the horizontal direction. |
| |
| Keywords: | horseshoe-shaped tunnel lateral pressure coefficient damage stability numerical simulation |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
