一个改进的堆石料广义塑性模型  

Modified generalized plasticity model for rockfill materials

作　　者：卞士海 李国英[2,3] 魏匡民 周健[1] BIAN Shi-hai LI Guo-ying WEI Kuang-min ZHOU Jian(Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210024, China Key Laboratory of Earth-Rock Dam Failure Mechanism and Safety Control Techniques, Ministry of Water Resources, Nanjing 210024, China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]南京水利科学研究院岩土工程研究所,江苏南京210024 [3]水利部土石坝破坏机理与防控技术重点试验室,江苏南京210024

出　　处：《岩土工程学报》2017年第10期1936-1942,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金青年基金项目(51509163);水利部公益性行业科研专项经费项目(201501035)

摘　　要：在广义塑性理论框架下,通过引入两个修正系数修正塑性模量,增强了广义塑性模型在高围压条件下的适应性,成功地将砂土广义塑性模型改造成堆石料广义塑性模型。提出的修正广义塑性模型参数较少,容易确定,具有一定的实用性,并且可以推广至状态相关情况。模型中塑性模量公式简洁,可以退化成等向压缩塑性模量。模型可以很好地预测堆石料常规三轴加载应力应变关系,对等P以及等应力比路径也具有一定适应性。Within the framework of generalized plasticity theory, the plastic modulus is modified by adding two correction factors to enhance the adaptability of model under high confining stress, thus the generalized plasticity model for sand is successfully transformed into the model for rockfill materials. The modified P-Z model has fewer parameters, all of which can be easily determined, and it is relatively practical and can be extended into a state-dependent constitutive model. The expression for plastic modulus is simple and can be degenerated to that for isotropic compression tests. The modified model can well simulate the stress-strain behaviours of rockfill materials of triaxial tests and can aslo capture the stress-strain features under other stress paths.

关 键 词：广义塑性模型 塑性模量 修正系数 应力路径 模型验证 

分 类 号：TV641[水利工程—水利水电工程] TU441[建筑科学—岩土工程]