【作者】 刘耀儒； 冷旷代； 钱京娟； 黄跃群； 杨强；

【Author】 LIU Yao-ru 1,LENG Kuang-dai 1,QIAN Jing-juan 2,HUANG Yue-qun 3,YANG Qiang 1(1.State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;2.Ningxia Guodian CSI New Energy Development Co.,Ltd,Ningxia,Yinchuan 750001,China;3.Wuling Power Co.,Ltd,Hunan,Changsha 410004,China)

【机构】 清华大学水沙科学与水利水电工程国家重点实验室； 宁夏国电阿特斯新能源开发有限公司； 五凌电力有限公司；

【摘要】 传统的刚体极限平衡法假定太强,不能反映岩体中实际的应力分布。基于三维多重网格法,分别建立用于有限元计算的结构网格和用于计算滑面稳定安全系数的滑面网格,可以方便地获得任意滑面或滑块的稳定安全系数,从而将非线性有限元和极限平衡分析结合起来。给出了具有单滑面和楔形双滑面滑移体稳定安全系数的统一计算公式及其适用范围。采用三维非线性动力有限元方法进行岩土工程结构地震作用下的时程分析,获得不同时刻下的应力场,进而计算得到滑面上内力的分布时程和滑移体稳定安全系数时程。通过综合分析,对岩土结构的抗震稳定性进行综合评价。最终应用于大岗山拱坝右岸高边坡的滑移体抗震稳定分析和评价中。结果表明,由于考虑了岩体结构的真实内力分布,结果更符合实际情况。更多还原

【Abstract】 It is difficult to get real distributed stress in the limit equilibrium analysis of rigid body due to strong assumation.Based on multi-grid method,structure grid for nonlinear FEM and sliding surface grid for calculating safety factor were established separately in this paper.So the sliding safety factor of arbitrary sliding surface or sliding blocks can be obtained.Thus limit equilibrium analysis can be integrated with nonlinear finite element method(FEM).For blocks sliced by single slide surface and wedge-shaped double slide surfaces,general formulas of safety factor as well as their applicability are given.Time history analysis is performed on geotechnical engineering structures under earthquake actions using 3-dimensional nonlinear finite element method(FEM).The stress field in domain is converted to the distribution of internal force on slide surfaces.The safety factor time history of slide block can be furthermore obtained via limit equilibrium analysis and its aseismic stability can be evaluated.Analysis and evaluation of slide block aseismic stability are performed on high slope on the right bank of Dagangshan arch dam.The results show that the method is accord with real conditions.更多还原