互层岩体隧道开挖之个别元素法分析  

Numerical Study of Tunnel Excavation under Interstratified Rock Mass by Distinct Element Modeling

作　　者：郑富书[1] 黄灿辉[1] 李宏辉[1] 李国诚[1] 

机构地区：[1]台湾大学土木工程学系

出　　处：《隧道建设》2007年第S2期174-178,共5页Tunnel Construction

摘　　要：本研究采个别元素法为分析工具,以具键结特性之二维圆盘颗粒进行互层岩体隧道开挖分析。根据本研究建立之互层岩体单压试验模型,在层面倾角由0°变化至90°的条件下,模拟之单压强度与杨氏模数二者与层面倾角之关系,符合前人实验结果。在隧道分析部份,本文先以均质等向线弹性材料之圆形孔洞应力分析进行模式验证,结果显示解析解与数值分析之应力等高线图分布一致。互层岩体隧道分析则是在不考虑衬砌与岩栓等支撑结构的前提下,仅先针对互层倾角的变化与材料力学参数的折减,对圆形开挖断面之影响进行数值模拟与结果探讨。A particle flow code based on the distinct element method ( DEM) was adopted to analyze the tunnel excavation under interstratified rock mass. For a parameters calibration, an unconfined compression test was modeling firstly, and the simulated results can reflect the influence of the dip angle on the unconfined compression strength and the Young s modulus. In addition, the numerical analysis of the stress around a circle excavation was compared with the analysis solution, and it indicates that the adopted model is suitable to analysis the excavation problem of a tunnel. Finally, a tunnel excavation under interstratified rock mass was simulated with the dip angle 0°,45°, and 90°, and the results show that the adopted model can imitate the failure and engineering problems during tunneling in Taiwan, such as squeezing, block falling, buckling and caving.

关 键 词：互层岩体 个别元素法 隧道 

分 类 号：U451[建筑科学—桥梁与隧道工程]