干湿循环条件下岩石蠕变本构模型研究及应用  

Research and application of rock creep constitutive model under different dry-wet cycles

作　　者：侯迪 许珍 莫至坤[2,3] 姚池 叶志伟 HOU Di;XU Zhen;MO Zhikun;YAO Chi;YE Zhiwei(Guizhou Survey and Design Research Institute for Water Resources and Hydropower,Guiyang 550002,China;Jiangxi Key Laboratory of Tailings Reservoir Engineering Safety,Nanchang 330031,China;School of Architecture and Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]贵州水利水电勘测设计研究院,贵州贵阳550002 [2]江西省尾矿库工程安全重点实验室,江西南昌330031 [3]南昌大学工程建设学院,江西南昌330031

出　　处：《人民长江》2023年第12期218-224,共7页Yangtze River

基　　金：国家自然科学基金面上项目(52079062);国家自然科学基金青年项目(52004127);贵州省科技支撑计划项目([2020]4Y052)。

摘　　要：库水位周期性涨落使库区边坡岩石反复经历干湿循环过程,岩石蠕变特性发生显著变化,直接影响边坡稳定。针对干湿循环条件下岩石蠕变特性,将非线性阈值元件与西原模型串联,建立了考虑干湿循环作用的岩石蠕变本构模型。将该模型嵌入FLAC 3D分析程序中,并用于锦屏一级水电站左岸边坡蠕变分析。研究结果表明:提出的非线性蠕变本构模型可以准确描述岩石蠕变的全过程,通过二次开发分析程序能准确计算岩石蠕变位移,将其用于模拟分析不同干湿循环次数下边坡蠕变效果良好,能直观给出边坡蠕变位移显著增大区域的位置和范围,可为采取合理工程措施以保持边坡稳定及保障库坝运行安全提供参考。Periodic rises and falls of reservoir water level cause the repeated dry-wet cycles of reservoir slope rock,resulting in significant changes in rock creep characteristics,and affecting the stability of the slope directly.A nonlinear threshold element was connected with the Nishihara model in series to establish a constitutive model of rock creep considering the effect of dry-wet cycles.The new model was embedded into FLAC 3D and used in the creep analysis of the left bank slope in Jinping I Hydropower Station.The results show that the nonlinear creep constitutive model proposed could accurately describe the whole process of rock creep,and the secondary development program could accurately calculate the rock creep displacement.When it was used to simulate and analyze the slope creep displacement under different dry-wet cycles,we obtained satisfied results,and the location and range of the area where the slope creep displacement significantly increased could be given intuitively.The findings can provide a reference for taking reasonable engineering measures to maintain slope stability and ensure the operation safety of dams.

关 键 词：水库边坡 岩石 干湿循环 蠕变特性 本构模型 锦屏一级水电站 

分 类 号：P641[天文地球—地质矿产勘探] TV45[天文地球—地质学]