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岩石非线性黏弹塑性流变模型(河海模型)及其应用

期刊名称：岩石力学与工程学报
时间：0
页码：433-447
语言：中文
分类：TU45[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]河海大学岩土工程研究所,江苏南京210098
相关基金：国家重点基础研究发展规划（973）项目（2002CB412707）;国家自然科学基金重点项目（50539110）
相关项目：断续预制裂纹岩石三轴流变力学特性的试验与模型研究

关键词：岩石力学, 非线性黏弹塑性流变模型, 蠕变特性, 松弛特性, 程序研制, 工程应用, rock mechanics, nonlinear viscoelasto-plastic rheological model, creep property , relaxation property, code development, engineering application

中文摘要：

通过将作者提出的非线性黏塑性体与五元件线性黏弹性模犁串联，建立一个新的岩石非线性黏弹塑性流变模犁（河海模型），该流变模型可以充分反映岩石的加速流变特性。推导了岩石在恒应力与恒应变情况下的流变方程，从理论上对岩石非线性蠕变和松弛特性进行分析，同时利用在岩石流变倒服仪上扶得的蠕变全程试验曲线，对提出的非线性黏弹塑性流变模型进行充分验证，试验曲线与非线性流变模型的比较，显示了所建流变模型的正确性与合理性。基于提出的岩石非线性黏弹塑性流变模犁，推导该非线性流变模型在三维条件下的中心差分格式，采用FLAC^3D所提供的二次开发程序接口，研制岩石非线性流变数值程序，同时通过一个单轴压缩算例，进一步验证提出的非线性流变模型的正确性与合理性。采用研制的非线性流变数值程序，对锦屏一级水电站坝基岩石工程进行三维流变数值模拟，分析结果为锦屏一级水电站坝基岩石工程的长期稳定与安全性提供了合理建议与评价。

英文摘要：

By connecting the nonlinear viscoplastic body（NVPB） model put forward by the authors and five-component viscoplastic model in series, a new seven-component nonlinear viscoelasto-plastic rheological model of rock（Hohai model） is proposed, which can reflect fully the accelerative rheological property of rock material. The rheological equations of rock at the constant stress and strain are deduced. The nonlinear creep property and relaxation property of rock are carried out based on the theoretical analysis and investigation. At the same time, on the basis of complete creep curves gained by using rock servo-controlling rheology equipment, the identification of the proposed seven-component nonlinear viscoelasto-plastic rheological model of rock is validated. The comparison between nonlinear theological model and experimental curve shows that the proposed nonlinear viscoelasto-plastic rheological model is available and reasonable. Based on the proposed seven-component nonlinear viscoelasto-plastic rheological model of rock, the central difference equation in three-dimensional condition of this nonlinear rheological model is deduced. By adopting the secondary development routine interface of software--fast Lagrangian analysis of continua （FLAC^3D）, the numerical analysis code of nonlinear rheological model is investigated and developed. Through a uniaxial compression numericalexample, the correctness and rationality of the proposed nonlinear rheological model is validated further. In the end, by adopting the developed nonlinear rheological numerical code, the three-dimensional simulation is conducted for the dam foundation of Jinping First Stage Hydropower Station, and the analysis results bring forward reasonable suggestion and evaluation for the long-term stability and safety of dam foundation of Jinping First Stage Hydropower Station.

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