考虑颗粒破碎影响的粗粒土临界状态研究

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英文篇名：Influences of particle breakage on critical state of coarse-grained soils 作者：武颖利 ; 皇甫泽华 ; 郭万里 ; 张兆省 英文作者：WU Ying-li;HUANGFU Ze-hua;GUO Wan-li;ZHANG Zhao-sheng;Geotechnical Engineering Department,Nanjing Hydraulic Research Institute;Construction Management Bureau of Qianping Reservoir,Henan Province; 关键词：粗粒土 ; 颗粒破碎 ; 临界状态 ; 三轴试验 英文关键词：coarse-grained soil;;particle breakage;;critical state;;triaxial test 中文刊名：YTGC 英文刊名：Chinese Journal of Geotechnical Engineering 机构：南京水利科学研究院岩土工程研究所;河南省前坪水库建设管理局; 出版日期：2019-07-15 出版单位：岩土工程学报 年：2019 期：v.41;No.339 基金：国家重点研发计划重点专项项目(2017YFC0404806);; 河南省水利科技攻关计划项目(GG201705);; 中央级公益性科研院所基本科研业务费专项资金项目(Y318005) 语种：中文; 页：YTGC2019S2008 页数：4 CN：S2 ISSN：32-1124/TU 分类号：31-34

摘要

粗粒土的临界状态是构建本构模型的重要工具,目前考虑颗粒破碎影响的粗粒土临界状态并不明确。通过大型三轴CD试验,研究了粗粒土在临界状态时的颗粒破碎规律和应力变形特性,探讨了颗粒破碎对粗粒土临界状态应力比和临界状态方程参数的影响。主要结论如下:①粗粒土的临界状态应力比M_c并不是定值,而是与围压之间呈现出非线性的关系;②初始孔隙比对于临界状态应力比M_c的影响则可以忽略;③初始级配相同,围压和初始孔隙比不同的粗粒土,其临界状态在e–(p/p_a)~ξ平面可以用同一条直线来描述,且直线的参数是与初始孔隙比和围压无关的常数。
        The critical state of coarse-grained soils is the important tool to study the constitutive model, however, the critical state of coarse soil considering the effect of particle breakage is not clear. The influences of particle breakage on the stress and deformation properties and the critical state of rockfills are studied through the large-scale triaxial CD tests. The main conclusions are as follows:(1) The critical-state stress ratio M_c of rockfill materials is not a constant, which is found to be passively correlated with the confining pressure.(2) While the effect of void ratio on M_c can be neglected.(3) The critical state of rockfill samples with different confining pressures and void ratios can be described by the same straight line in e–(p/p_a)~ξ plane, and the parameters of the straight line are constant.

引文

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