摘要
为研究地震工况下边坡的稳定响应,基于强度折减法,利用三维有限元模型对边坡进行静力分析和动力时程分析,对比不同工况条件下边坡失稳特征和边坡稳定安全系数。结果表明:高达98.6 m的水库软岩边坡开挖,通过喷砼、系统锚杆和局部预应力锚索等支护后,受地震工况影响,边坡整体位移量和特征断面位移量增加显著,最大位移增加量达到7.6倍;边坡塑性区深度增加明显,最大塑性区深度增加了1.5倍;坡体主应力值的变化量较小,且均为受压状态;在静力、动力工况条件下,边坡总体稳定,边坡安全系数降低约25%;静力、动力工况所对应有限元强度折减法安全系数均满足规范要求。
In order to study the stability response of the slope under earthquake conditions, based on the strength reduction method, the static analysis and dynamic and time history analysis of the slope were carried out with the three-dimensional finite element model, the characteristics of slope instability and safety factor slope stability were compared under different working conditions. The results show that when the soft rock slope of the reservoir with the height of 98.6 m is excavated and supported by shotcrete, system anchor bolt and local prestressed anchor cable, affected by seismic condition, the overall displacement and characteristic section displacement of the slope increase significantly, and the maximum displacement increases by 7.6 times;The plastic zone depth of the slope increases obviously, and the maximum depth of the plastic zone increases by 1.5 times;The change of principal stress value of slope is small, and all of them are in compression state;Under static and dynamic conditions, the slop is generally stable, and the slope safety factor is reduced by about 25%;The safety factor of the finite element strength reduction method corresponding to the static and dynamic working conditions meets the specification requirements.
作者
陈英
李智渊
向勇
徐凯
陈勇
李正文
CHEN Ying;LI Zhiyuan;XIANG Yong;XU Kai;CHEN Yong;LI Zhengwen(Sichuan Water Development Investigation,Design and Research Co.,LTD.,Chengdu 610015,China;Sich-uan Qingning Tianqi Engineering Construction Co.,LTD.,Chengdu 610211,China;Sichuan Energy Internet Research Institute,Tsinghua University,Chengdu 610071,China)
出处
《铜业工程》
CAS
2023年第1期91-97,共7页
Copper Engineering
基金
国家重点研发计划项目(2019YFB1310504)
四川省科技计划项目(2022YFSY0011)资助。
关键词
强度折减法
有限元模型
边坡稳定性
安全系数
塑性区
strength reduction method
finite element model
slope stability
safety factor
plastic zone
作者简介
陈英(1989—),女,四川资阳人,博士,高级工程师,研究方向:水工结构设计与研究,E-mail:chenying_scdx@163.com;通信作者:李智渊,高级工程师,E-mail:84335223@qq.com。
