| 张京伍,李明东,荣耀,刘志丹,管仲敏.隧道洞口段非均质及各向异性土质裂缝仰坡稳定性上限解[J].计算力学学报,2023,40(2):281~288 |
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| 隧道洞口段非均质及各向异性土质裂缝仰坡稳定性上限解 |
| Upper bound solution of slopes with cracks at tunnel entrance considering nonhomogeneity and anisotropy of soil strength |
| 投稿时间：2021-09-22 修订日期：2021-12-26 |
| DOI：10.7511/jslx20210922001 |
| 中文关键词: 隧道 边坡稳定性 非均质性 各向异性 拉裂缝 极限分析 |
| 英文关键词:tunnel slope stability nonhomogeneity anisotropy tensile crack limit analysis |
| 基金项目:国家自然科学基金(52068033;51869001); 江西省桥梁结构重点实验室开放研究基金(JXBS2020004)资助项目. |
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| 中文摘要: |
| 针对忽略岩土体非均质和各向异性将导致边坡稳定性评价产生误差的问题,应用极限分析上限理论及抗剪强度系数折减法,推导土体强度非均质和各向异性影响下隧道洞口含裂缝仰坡稳定性解析式,探究土体强度非均质和各向异性对仰坡稳定性系数、坡顶裂缝位置、隧道拱顶失稳范围及仰坡安全系数的影响。结果表明,裂缝深度及坡角越大,仰坡稳定性系数越小;非均质系数越大和各向异性系数越小,维持仰坡稳定的临界坡高越大;非均质系数及各向异性系数越大,裂缝距坡顶边缘越远,隧道拱顶失稳范围越大;非均质系数增大有利于仰坡稳定,而各向异性系数越大仰坡越易失稳。 |
| 英文摘要: |
| In view of the slope stability evaluation error caused by ignoring the nonhomogeneity and anisotropy of soil,the theory of limit analysis coupled with the strength reduction method is applied,and the analytical formula for the stability of the slopes with cracks at tunnel entrance considering nonhomogeneity and anisotropy is derived.The influence of nonhomogeneity and anisotropy on the stability coefficient of slopes,the crack position of the slopes,the collapse range of tunnel vault and the safety factor are explored.The results demonstrate that the greater the crack depth and slope angle,the smaller the stability coefficient of the slope.The larger the nonhomogeneity coefficient and the smaller the anisotropy coefficient are,the larger the critical height of the slope is.When the nonhomogeneity coefficient and anisotropy coefficient increase,the crack position gets farther away from the edge of the top of the slope,which means the collapse range of the tunnel vault becomes greater.The increase of the coefficient of nonhomogeneity is beneficial to the stability of the slope,while the increase of the coefficient of anisotropy will lead to the instability of the slope. |
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