摘要
该文简单介绍了边坡地震自由场输入模型,其中,拉格朗日不连续变形分析方法(LDDA)被用来模拟断层、裂隙和结构面,粘弹性边界为吸能边界以体现无限地基辐射阻尼的影响,利用该模型,对白鹤滩水电站左岸岩质边坡进行了分析计算。通过引入岩体结构面降强系数与地震作用超载系数,分别建立了这两个系数和最大残余位移以及结构面最大张开度的关系,从而得出加固后白鹤滩左岸边坡设计地震作用下强度储备安全系数约为1.18,而超载安全系数约为1.25的结论。该文提出的分析方法有别于刚体极限平衡分析,通过工程实际应用表明,边坡地震自由场输入模型为边坡动力稳定分析提供了一个有效的工具。
Lagrange discontinuous deformation analysis(LDDA) and the earthquake free field input model for the slope analyses with the spring-viscous boundaries are simply introduced, in which LDDA is used to model faults, joint cracks, and fracture structure planes. The Bai He Tan left rock slope is calculated and analyzed by the model. The coefficient of reduced strength and earthquake-overloading factors are introduced, thusly the relationship among these coefficients and dynamic displacement, as well as joint opening is established. The results show that the strength-reserve-safety factor of reinforced Bai He Tan left rock slope under a design earthquake is about 1.18, earthquake-overloading safety factor is about 1.25. The present analysis method, different from that using rigid limit equilibrium, is an optional power tool for slope dynamic stability analyses.
出处
《工程力学》
EI
CSCD
北大核心
2014年第S1期149-154,共6页
Engineering Mechanics
基金
水科院科研专项(抗集0931
抗集1026)
水利部公益性行业科研专项项目(201001035
200901054)
关键词
边坡
地震输入模型
强储系数
地震超载系数
边坡稳定
slope
earthquake input model
the coefficient of strength reserve
earthquake-overloading factors
slope stability
