径向裂纹对隧道围岩稳定性影响的数值分析  

Numerical Analysis of the Influence of Radial Cracks on the Stability of Tunnel Surrounding Rock

作　　者：甘俊 白金朋 董延安 GAN Jun;BAI Jinpeng;DONG Yan’an(Beijing Engineering Corporation Limited,Beijing 100024,China)

机构地区：[1]中国电建集团北京勘测设计研究院有限公司,北京100024

出　　处：《合肥学院学报（综合版）》2023年第2期101-108,共8页Journal of Hefei University：Comprehensive ED

基　　金：中国电建集团北京勘测设计研究院有限公司专题科研项目(ZT2016-06)。

摘　　要：为研究隧道周边径向裂纹对围岩稳定性的影响,基于内聚力模型建立了一系列隧道模型并进行了连续-非连续数值模拟研究,分析了不同径向裂隙条件下隧道围岩的破坏方式与特征。模型中,径向裂纹具有不同的空间位置与方向,裂纹位置分别为拱肩、拱顶、拱脚及边墙处。结果表明:当径向裂纹位于拱顶时,45°裂纹的存在将不利于隧道的稳定;相同条件下,当径向裂隙位于边墙和拱脚位置时,更加不利于隧道稳定。通过与相关室内试验、数值模拟结果的对比,表明基于内聚力模型的数值分析结果与室内试验结果具有良好的一致性,相比其它数值分析模型,能够更准确地模拟隧道围岩的破坏特征。In order to study the influence of radial cracks around the tunnel on the stability of surround-ing rock,a series of tunnel models were established based on the cohesion model and continuous-dis-continuous numerical simulation studies were carried out.In the model,the radial cracks have different spatial positions and directions,and the crack positions are at the spandrel,vault,arch toe and side wall respectively.The results show that when the radial crack is located on the vault,the existence of the 45°crack will not be conducive to the stability of the tunnel;When the radial crack is located at the side wall and the arch toe,it is even more detrimental to the stability of the tunnel under the same conditions.The comparison with the results of related indoor experiments and numerical simulations shows that the numerical analysis results based on the cohesion model are in good agreement with the indoor experimental results.Compared with other numerical analysis models,it can more accurately simulate the failure characteristics of the tunnel surrounding rock.

关 键 词：公路隧道 围岩稳定性 数值计算 工程岩体 内聚力模型 径向裂纹 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]