软弱岩体蠕变模型辨识与参数反演  

Identification of creep model and parameters inversion for soft rock mass

作　　者：张强勇[1] 张建国[1] 杨文东[1] 贺如平[2] 

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061 [2]中国水电顾问集团成都勘测设计研究院,四川成都610072

出　　处：《水利学报》2008年第1期66-72,共7页Journal of Hydraulic Engineering

基　　金：国家自然科学基金重点资助项目(40772173);山东省自然科学基金资助项目(Y2007F52)

摘　　要：压缩蠕变试验是了解岩体蠕变力学特性的重要手段。通过对大岗山水电站坝区软弱岩体现场压缩蠕变试验资料的分析,揭示坝区软弱岩体具有瞬时弹性变形、减速蠕变和弹性后效特性。通过对各种流变组合模型的辨识,确定采用广义开尔文模型来反映坝区软弱岩体的压缩蠕变特性。根据辨识的蠕变模型推导出了刚性承压板边缘岩体表面的压缩蠕变变形计算公式,据此采用优化反演法获得了坝区软弱岩体的瞬时弹性模量、黏弹性模量和黏滞系数等蠕变参数,从而为坝区边坡加固设计和稳定性分析提供了重要的岩体流变参数资料。Compressive creep test is an important means for understanding creeping mechanical properties of rock mass.The analysis on in-situ compressive creep test information indicates that the soft rock mass in dam zone of the Dagangshan Hydropower station possesses the characteristics of instantaneous elastic deformation, deceleration creep and elasticity after effect.The generalized Kelvin model is used to reflect compressive creep properties of soft rock mass in dam zone after identifying various rheological combination models.The compressive creep deformation formula for circular rigid bearing plate is deduced according to the identified creep model.Some creep parameters of soft rock mass such as instantaneous elastic modulus,viscoelastic modulus and viscosity coefficient are obtained by way of the optimized inversion method through the deduced compressive creep deformation formula,which provides important rheological parameters for supporting design and stability analysis for rock slope in dam zone.

关 键 词：刚性承压板 压缩蠕变试验 蠕变模型辨识 蠕变参数反演 

分 类 号：TV223.3[水利工程—水工结构工程]