Abstract
Rockfill materials have been widely used in the construction of rockfill dam, railway and highway subgrade due to its high filling density, good compaction performance, strong water permeability, small settlement deformation and high bearing capacity. A reasonable constitutive model for rockfill materials is very important for engineering computation and analysis, and has a great development space. Based on the crushing stress and spatial mobilized plane (SMP), a state parameter that can comprehensively reflect the anisotropy and grain crushing is proposed. This state parameter is used to improve the MPZ model (a modifed Zienkiewicz III model), so that a generalized plastic model is constructed to describe the stress and deformation characteristics of rockfill materials in engineering. The validity of the developed model is verified by a series of conventional triaxial tests with different inclination angles of the compaction plane. The variation trend of the constructed anisotropy index ω can reflect the non monotonic variation of the deformation and strength of rockfill with the direction angle of large principal stress, so the model can reflect the obvious difference caused by the initial anisotropy of rockfill on the mechanical properties.
摘要
堆石料以其填筑密度高、压实性能好、透水性强、沉降变形小、承载力高等优点, 在堆石坝、 铁路、公路路基等工程建设中得到广泛应用. 合理的堆石料本构模型对工程计算和分析具有重要意 义, 且目前仍具有很大的发展空间. 基于破碎应力和空间滑动面(SMP)的概念, 提出了一个能综合反 映颗粒破碎和各向异性的状态参数. 利用该状态参数对修正ZienkiewiczIII模型(MPZ模型)进行了改进, 构造了一个能够描述堆石料应力变形工程特性的广义塑性模型. 本文通过一系列不同压实面倾角的常 规三轴试验, 验证了该模型的有效性. 由于所构造的各向异性指标ω 的变化趋势能够反映堆石料的变 形和强度随大主应力方向角非单调变化的特征, 故该模型可以反映堆石料初始各向异性对力学特性造 成的明显差异.
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Project(2017YFC0404802) supported by the National Key R& D Program of China; Projects(U1965206, 51979143) supported by the National Natural Science Foundation of China; Project([2018]5630) supported by the Talents of Guizhou Science and Technology Cooperation Platform, China
Contributors
The overarching research goals were developed by WANG Xiang-nan and YU Yu-zhen. ZHAN Zheng-gang provided the study cases. ZHANG Xiang-tao, GAO Yi-zhao and WANG Xiang-nan established the models, completed the program construction and calculated the study cases. The initial draft of the manuscript was written by WANG Xiang-nan, GAO Yi-zhao, ZHANG Xiang-tao. ZHANG Xiang-tao, GAO Yi-zhao, WANG Xiang-nan, YU Yu-zhen replied to reviewers’ comments and revised the final version.
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ZHANG Xiang-tao, GAO Yi-zhao, WANG Xiang-nan, YU Yu-zhen, ZHAN Zheng-gang declare that they have no conflict of interest.
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Zhang, Xt., Gao, Yz., Yu, Yz. et al. Generalized plasticity model considering grain crushing and anisotropy for rockfill materials. J. Cent. South Univ. 29, 1274–1288 (2022). https://doi.org/10.1007/s11771-022-4999-4
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DOI: https://doi.org/10.1007/s11771-022-4999-4