Geomechanics and Engineering

  • 제11권2호
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  • Pages.253-267
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  • 2016
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Study on mechanism of macro failure and micro fracture of local nearly horizontal stratum in super-large section and deep buried tunnel

  • Li, Shu-cai (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Wang, Jian-hua (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Chen, Wei-zhong (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Li, Li-ping (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • Zhang, Qian-qing (Research Center of Geotechnical and Structural Engineering, Shandong University) ;
  • He, Peng (Research Center of Geotechnical and Structural Engineering, Shandong University)
  • 투고 : 2015.03.12
  • 심사 : 2016.04.28
  • 발행 : 2016.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

The stability of surrounding rock will be poor when the tunnel is excavated through nearly horizontal stratum. In this paper, the instability mechanism of local nearly horizontal stratum in super-large section and deep buried tunnel is revealed by the analysis of the macro failure and micro fracture. A structural model is proposed to explain the mechanics of surrounding rock collapse under the action of stress redistribution and shed light on the macroscopic analytical approach of the stability of surrounding rock. Then, some highly effective formulas applied in the tunnel engineering are developed according to the theory of mixed-mode micro fracture. And well-documented field case is made to demonstrate the effectiveness and accuracy of the proposed analytical methods of mixed-mode fracture. Meanwhile, in order to make the more accurate judgment about yield failure of rock mass, a series of comprehensive failure criteria are formed. In addition, the relationship between the nonlinear failure criterion and $K_I$ and $K_{II}$ of micro fracture is established to make the surrounding rock failure criterion more comprehensive and accurate. Further, the influence of the parameters related to the tension-shear mixed-mode fracture and compression-shear mixed-mode fracture on the propagation of rock crack is analyzed. Results show that ${\sigma}_3$ changes linearly with the change of ${\sigma}_1$. And the change rate is related to ${\beta}$, angle between the cracks and ${\sigma}_1$. The proposed simple analytical approach is economical and efficient, and suitable for the analysis of local nearly horizontal stratum in super-large section and deep buried tunnel.

키워드

과제정보

연구 과제 주관 기관 : Nation Natural Science Foundation of China, Natural Science Foundation of Shandong Province of China

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피인용 문헌

  1. Roof collapse of shallow tunnel in layered Hoek-Brown rock media vol.11, pp.6, 2016, https://doi.org/10.12989/gae.2016.11.6.867
  2. Optimization study on roof break direction of gob-side entry retaining by roof break and filling in thick-layer soft rock layer vol.13, pp.2, 2017, https://doi.org/10.12989/gae.2017.13.2.195
  3. Zonal disintegration test of deep tunnel under plane strain conditions vol.7, pp.2, 2016, https://doi.org/10.1007/s40789-020-00319-y
  4. A cross-river tunnel excavation considering the water pressure effect based on DEM vol.25, pp.11, 2016, https://doi.org/10.1080/19648189.2019.1615555