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Mechanism of stress distribution and failure around two different shapes of openings within fractured rock-like materials

裂隙化类岩材料中两种不同形状开孔周围的应力分布和破坏机理

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Abstract

The complexity of a rock masses structure can lead to high uncertainties and risk during underground engineering construction. Laboratory tests on fractured rock-like materials containing a tunnel were conducted, and two-dimensional particle flow models were established. The principal stress and principal strain distributions surrounding the four-arc-shaped and inverted U-shaped tunnels were investigated, respectively. Numerical results indicated that the dip angle combination of preexisting fractures directly affects the principal stress, principal strain distribution and the failure characteristics around the tunnel. The larger the absolute value of the preexisting fracture inclination angle, the higher the crushing degree of compression splitting near the hance and the larger the V-shaped failure zone. With a decrease in the absolute value of the preexisting fracture inclination angle, the compressive stress concentration of the sidewall with preexisting fractures gradually increases. The types of cracks initiated around the four-arc-shaped tunnel and the inverted U-shape tunnel are different. When the fractures are almost vertical, they have a significant influence on the stress of the sidewall force of the four-arc-shaped tunnel. When the fractures are almost horizontal, they have a significant influence on the stress of the sidewall of the inverted U-shaped tunnel. The findings provide a theoretical support for the local strengthening design of the tunnel supporting structure.

摘要

岩体结构的复杂性会导致地下工程在施工过程中的高度不确定性和风险。本研究采用类岩材料室内试验和二维颗粒流数值模拟相结合的方式，分别研究了四心圆形隧道和马蹄形隧道周围的主应力和主应变分布。数值结果表明，既有的裂隙倾角组合直接影响隧道周围的主应力、主应变分布和破坏特征。预裂隙的倾角绝对值越大，两类隧洞均在拱腰(M-4 和M-5)附近的挤压劈裂破碎程度逐渐加剧，“V”形破坏区也越大。随着预裂隙倾角绝对值的减小(60°→45°→30°)，预裂隙的侧壁压应力集中程度逐渐增加。四心圆形隧道和马蹄形隧道周围产生的裂缝类型不同。当裂隙近于垂直时，对四心圆形隧洞侧壁受力影响较大；而当裂隙近于水平时，对马蹄形隧洞边墙受力影响较大。以上发现，为隧道支护结构的局部加固设计提供了理论支持。

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Authors and Affiliations

  1. School of Highway, Chang’an University, Xi’an, 710064, China

    Xiang Fan  (范祥), Zhi-jun Yang  (杨治军), Ming Hong  (洪铭), Hao Yu  (余灏) & Yong-li Xie  (谢永利)

  2. Gansu Province Transportation Planning, Survey & Design Institute Co., Ltd., Lanzhou, 730030, China

    Zhi-jun Yang  (杨治军)

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  1. Xiang Fan  (范祥)
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  2. Zhi-jun Yang  (杨治军)
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  3. Ming Hong  (洪铭)
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  4. Hao Yu  (余灏)
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  5. Yong-li Xie  (谢永利)
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Correspondence to Xiang Fan  (范祥).

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Foundation item

Project(41807241) supported by the National Natural Science Foundation of China; Project(2021M693544) supported by China Postdoctoral Science Foundation; Project(2022JM-160) supported by the Natural Science Basic Research Program of Shaanxi, China

Contributors

FAN Xiang provided the concept and wrote the first draft of the manuscript. YANG Zhi-jun analyzed the measured data and edited the draft of manuscript. HONG Ming conducted the literature review and wrote the first draft of manuscript. YU Hao verified the data. XIE Yong-li provided support for the manuscript. All authors replied to reviewers’ comments and revised the final version.

Conflict of interest

FAN Xiang, YANG Zhi-jun, HONG Ming, YU Hao and XIE Yong-li declare that they have no conflict of interest.

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Fan, X., Yang, Zj., Hong, M. et al. Mechanism of stress distribution and failure around two different shapes of openings within fractured rock-like materials. J. Cent. South Univ. 29, 1916–1932 (2022). https://doi.org/10.1007/s11771-022-5048-z

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