复杂应力路径人工冻土三轴剪切试验及本构模型

发布时间：2018-01-02 18:10

本文关键词：复杂应力路径人工冻土三轴剪切试验及本构模型　出处：《煤炭学报》2016年S2期 　论文类型：期刊论文

【摘要】：构建人工冻土BP神经网络本构模型,利用冻土三轴实验数据对神经网络模型进行训练,并2次开发有限元本构程序。用BP神经网络本构模型能很好的反映人工冻土非线性,人工冻土三轴数值模拟值和实验值误差在2.43%范围内。通过深井冻结工程数值模拟表明:人工冻土BP神经网络本构模型能较好的描述复杂应力路径变形特征,数值结果和现场实测规律一致,且和实测位移误差在5.0%;应用BP神经网络冻土本构模型准确预测预报人工冻土帷幕应力场和变形场,为冻结工程设计与施工提供参考。
[Abstract]:The constitutive model of artificial frozen soil BP neural network was constructed, and the neural network model was trained by using the data of frozen soil triaxial experiment. The finite element constitutive program is developed twice. The BP neural network constitutive model can well reflect the nonlinear behavior of artificial frozen soil. The error of triaxial numerical simulation and experimental value of artificial frozen soil is in the range of 2.43%. The numerical simulation of freezing engineering in deep well shows that:. Artificial frozen soil BP neural network constitutive model can better describe the deformation characteristics of complex stress paths. The numerical results are consistent with the measured results, and the displacement error is 5.0. The BP neural network constitutive model of frozen soil is used to accurately predict the stress field and deformation field of artificial frozen soil curtain, which provides a reference for the design and construction of freezing engineering.
【作者单位】：中国科学院寒区旱区与环境工程研究所冻土工程国家重点实验室;福建工程学院土木工程学院;安徽理工大学土木建筑工程学院;
【基金】：国家重点基础研究计划(973)资助项目(2012CB026102) 国家自然科学基金资助项目(41271071,41672278)
【分类号】：TU445
【正文快照】： 近几十年来损伤力学理论在岩土工程中的研究得到了迅速发展,并获得了大量的关于损伤岩土本构模型。Dougill等率先开展了岩石类损伤力学特性研究,随后Morz and Dragon应用损伤力学概念提出能反映岩土材料应变软化的弹性非线性本构模型,利用损伤演化与塑性膨胀率相关建立了岩土

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