岩土本构模型的模糊系统辨识方法  

Identification of geo-material constitutive model using fuzzy system

作　　者：石修松[1] 程展林[1] 王路君[1] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《水利水运工程学报》2010年第3期10-16,共7页Hydro-Science and Engineering

基　　金：国家自然科学基金;二滩水电开发有限公司雅砻江水电开发联合研究基金资助项目(50639050)

摘　　要：提出了利用模糊系统对岩土类材料的本构模型进行辨识,根据岩土类材料的特殊性,设计了模糊系统的输入输出变量、结构参数及相应的算法,利用梯度下降法设计模糊系统。系统阐述了将模糊系统用于本构模型建模的基本思想,并对模糊系统在岩土工程其它领域的应用前景提出了自己的看法。在此基础上利用模糊系统对堆石料的本构模型进行仿真,并将其与试验值进行比较。结果表明,模糊系统对增p路径下的本构模型取得了很好的仿真效果,仿真曲线较为光滑,对实验数据的逼近能力和泛化能力显著.Fuzzy system is put forward for identification of geo-material constitutive model.According to the choracteristics of geotechnical materials,the author designs the fuzzy system′s input and output variables,its structural parameters and the corresponding algorithm.Then the fuzzy system is designed using gradient descent method.Based on those,the author elaborates the modeling ideology on constitutive model using fuzzy system,and also puts forward views on the appliance of other areas in geotechnical engineering.Then,the constitutive model of rockfill material in increase path is simulated.After comparing with the experimental value,the results show that the fuzzy system′s simulation of constitutive model in increase path has obtained good results.The simulated curve of gradient descent method is relatively smooth and its approximation capabilities and generalization improves significantly.Not only is the simulation approximate to test results,but also its ε-（p,q） surfaces are smooth,showing no over-fitting phenomenon.

关 键 词：模糊系统 本构模型 梯度下降法 堆石料 

分 类 号：TU41[建筑科学—岩土工程]