Numerical Study on the Triaxial Stress Condition for Ring-like Fractures around Deep Underground Openings
Numerical Study on the Triaxial Stress Condition for Ring-like Fractures around Deep Underground Openings
复制标题
深部地下洞室周围环状裂缝三轴应力条件的数值研究
DOI：
10.1520/jte20170202
复制
发表时间：
2018
影响因子：
1.2
通讯作者：
P. Jia
中科院分区：
文献类型：
--
作者：
P. Jia
深埋隧道围岩的破裂模式与地应力密切相关，而地应力一般具有很强的各向异性。通过三维数值模拟，研究了隧道周边环状裂隙形成的三轴应力条件。分析了不同三向异性应力作用下隧道周边及掌子面前方的裂隙形态，并讨论了隧道形状对环形裂隙形成的影响。根据模拟结果，提出了环形裂缝形成的概念性判据。结果表明，无论隧道形状如何，当轴向压力系数小于0.3时，都可以预期环形破裂。环状裂缝更可能位于曲率半径较大的无隧道表面附近。这篇文章的目的是揭示一些光在深地下开挖中的破坏现象的解释。
The fracture pattern of rock mass surrounding a deep tunnel is closely related to the in situ stress, which is generally quite anisotropic. This study focuses on the triaxial stress condition for the formation of ring-like fractures around tunnels through three dimensional numerical modeling. The fracture patterns around both the tunnel and ahead of the tunnel face under different anisotropic triaxial stresses were analyzed, and the influence of tunnel shape on the formation of ring-like fractures was also discussed. A conceptual criterion for the formation of ring-like fractures was proposed based on the simulations. It was found that the ring-like fractures can be expected when the axial pressure coefficient is less than 0.3, regardless of the tunnel shape. Ring-like fractures are more likely to be located near tunnel-free surfaces with a larger radius of curvature. The aim of this article is to shed some light on the interpretation of failure phenomenon in deep underground excavations.