隧道洞口段含裂缝仰坡地震稳定性极限分析
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1.大成工程建设集团有限公司;2.江西省交通科学研究院

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P642.22 TU42

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Limit Analysis on the Stability of Fissured Slopes at Tunnel Entrance under Seismic Action
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1.Dacheng Engineering Construction Group Co,Ltd;2.Jiangxi Transportation Institute

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    摘要:

    为分析隧道洞口段仰坡稳定性问题,通过采用极限分析上限法开展地震力条件下坡顶裂缝对仰坡整体稳定性影响及裂缝位置分布研究。推导出可反映边坡临界坡高的稳定系数计算公式,进一步通过算例给出借助于稳定图以间接计算边坡安全系数的方法。研究结果表明:坡角、地震力系数及裂缝开展深度越大,稳定系数越小,而随着隧道埋深系数的增大,稳定系数随之增大;坡顶裂缝开裂深度增加导致裂缝位置分布越靠近坡顶边缘,而地震力作用及坡角的增大将导致坡顶裂缝位置分布远离坡顶边缘;随着地震力作用及裂缝深度的增大,边坡安全系数呈减小趋势,不利于边坡整体稳定。

    Abstract:

    In order to analyze the stability of the slope at the entrance of the tunnel, the upper-bound limit analysis method is used in this paper to study the influence of the crack on the overall stability of the slope under seismic force and the distribution of the crack position. A formula for calculating the stability number reflecting the critical slope height is derived, and a method for calculating the safety factor of the slope indirectly by means of the stability chart is given by an example. The results indicated that the larger the slope angle, seismic coefficient and the depth of crack is, the smaller the stability number will be, and with the increase of the depth coefficient of tunnel, the higher the stability number will be. The increase of crack depth leads to the distribution of crack location closer to the edge of the slope, while the increase of seismic coefficient and slope angle leads to the distribution of crack location farther away from the edge of the slope. As the seismic and crack depth becomes larger, the safety factor of the slope decreases, which is not conducive to the slope stability.

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周军平,俞俊平,林木水,等. 隧道洞口段含裂缝仰坡地震稳定性极限分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2020-09-29
  • 最后修改日期:2021-02-22
  • 录用日期:2021-02-22
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