基于强度-变形参数协调折减法的堆石坝稳定性分析  

Stability of Rockfill Dam Based on Coordinated Reduction Method of Strength-Deformation Parameters

作　　者：刘勇[1] 戴妙林[1] 张冀 吴玉江 LIU Yong;DAI Miao-lin;ZHANG Ji;WU Yu-jiang(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;China Power Construction Group Overseas Investment,Beijing 100048,China;Nanou River Basin Power Generation,Luang Prabang,Laos)

机构地区：[1]河海大学水利水电学院,江苏南京210098 [2]中国电建集团海外投资有限公司,北京100048 [3]南欧江流域发电有限公司,老挝琅勃拉邦

出　　处：《水电能源科学》2021年第12期100-103,共4页Water Resources and Power

摘　　要：当前用于堆石坝稳定性分析的强度折减法常采用理想弹塑性模型,未考虑堆筑过程强度和变形参数的变化,以及强度折减导致的变形参数的改变。因此,依据FLAC3D FISH语言二次开发平台,仿真计算堆筑过程和蓄水后的应力场,得到坝体变形和强度参数的初始分布。考虑变形参数随强度参数协调折减,结合突变理论定量确定坝体安全系数。结果表明,堆筑完成后的坝体弹模、泊松比及内摩擦角呈非均匀分布,强度-变形参数协调折减法计算得到的安全系数小于传统强度折减法,相同折减系数下的坝体位移更大,可为堆石坝现状评估与预警提供参考。The current strength reduction method used for stability analysis of rockfill dams usually adopts an ideal e-lastoplastic model,and does not consider the changes in the strength and deformation parameters of the stacking process,and the changes in deformation parameters caused by the strength reduction.Based on the secondary development platform of the FLAC30 FISH language,this paper simulates and calculates the stress field during the stacking process and after water storage,and obtains the initial distribution of the dam deformation and strength parameters.Considering the coordinated reduction of deformation parameters with strength parameters,the safety factor of the dam is quantitatively determined with catastrophe theory.The results show that the elastic modulus,Poisson’s ratio,and internal friction angle of the dam after the completion of the stacking show a non-uniform distribution,and the safety factor calculated by the strength-deformation parameter coordinated reduction method is smaller than that of the traditional strength reduction method.The dam body displacement is larger under the same reduction coefficient.The results can provide references for the current assessment and early warning of rockfill dams.

关 键 词：堆石坝 协调折减法 安全系数 突变理论 失稳判据 

分 类 号：TV223[水利工程—水工结构工程] TV641