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- Title
考虑土体强度非均质和各向异性的隧道洞口 仰坡地震稳定性上限解.
- Authors
张京伍; 荣耀; 李栋伟; 孙洋; 何昌春; 陈欣
- Abstract
Stability analysis of slopes at tunnel entrance is the key to tunnel engineering design. Considering the influence of soil strength inhomogeneity and anisotropy, combined with upper bound method of limit analysis and the strength reduction theory, the stability formula of upper bound solution for limit analysis of slope was derived, and the rationality of the proposed calculation method was verified by comparison. The effects of inhomogeneity and anisotropy coefficients on critical height of slope, failure position of tunnel vault and safety factors of slope under seismic force were investigated. The results show that the larger the coefficient of inhomogeneity and the smaller the coefficient of anisotropy, the higher the critical height requires to maintain the stability of the slope at tunnel entrance. The larger the coefficient of inhomogeneity and anisotropy is, the farther the initial sliding surface is from the shoulder of the slope, and the wider the failure range of the tunnel vault is. With the increase of the coefficient of anisotropy, the safety factor of the slope increases. While the increase of the coefficient of inhomogeneity leads to the decrease of the safety factor of the slope, the overall slope tends to be unsafe. The research results provide a theoretical basis for the stability design of tunnel entrance in mountain area.
- Publication
Science Technology & Engineering, 2022, Vol 22, Issue 36, p16152
- ISSN
1671-1815
- Publication type
Article