欢迎光临《计算力学学报》官方网站！

Upper bound solution of slopes with cracks at tunnel entrance considering nonhomogeneity and anisotropy of soil strength

DOI：10.7511/jslx20210922001

 作者 单位 E-mail 张京伍 东华理工大学 土木与建筑工程学院, 南昌 330013江西省交通科学研究院有限公司, 南昌 330200 zhangjingwu2010@126.com 李明东 东华理工大学 土木与建筑工程学院, 南昌 330013 荣耀 江西省交通科学研究院有限公司, 南昌 330200 刘志丹 合肥工业大学 土木与水利工程学院, 合肥 230009 管仲敏 鹏盛建设集团有限公司, 上饶 334600

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。

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.