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冰川冻土  2013 

地震荷载对滑坡稳定性的影响评估——以甘肃舟曲南桥滑坡为例

DOI: 10.7522/j.issn.1000-0240.2013.0079, PP. 692-700

Keywords: Druker-Prager屈服准则,地震作用,有限元强度折减法,滑坡稳定性,舟曲南桥滑坡

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Abstract:

通过实现Druker-Prager屈服准则与Mohr-Coulomb理论等效原则,采用ANSYS软件模拟,分别就自重和暴雨状态下施加地震荷载构成不同工况组合,分析评价了地震荷载对甘肃舟曲南桥滑坡稳定性的影响.以有限元强度折减法为基础,分别在不同地震设防烈度等级下,通过改变折减系数计算水平位移最大值和塑性区应变最大值,以出现突变点、计算不收敛和塑性区贯通来判别土体破坏,得到不同地震设防烈度下滑坡稳定系数.结果表明在自重+地震与暴雨+地震工况条件下,稳定系数差值为0.25~0.32,为2种工况的相互校核和理论推算提供了参考.有限元强度折减法与极限平衡法的对比分析表明,二者误差以小于5%为主,考虑地震工况比不考虑地震工况的滑坡稳定系数下降13%~16%,进一步验证了数值模拟计算的精准度和可靠性以及滑坡治理中抗震设防的重要性.计算结果符合实际,在科研和实际设计中值得推广.

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