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砂-粉混合料颗粒接触状态的临界条件确定

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砂-粉混合料被广泛应用于高速铁路路基、人工筑岛及海底沉管隧道垫层等重大工程,如何科学地表征砂-粉混合料复杂的颗粒接触状态及连续演变的力学行为特征,并深入揭示其对混合料静/动力学特性的影响已是一项紧迫的基础性科学研究任务.本文基于代表性砂-粉混合料的基本物理性能指标及力学特性指标试验数据,验证Rahman等提出的区分"细粒填充砂粒"和"砂粒悬浮细粒"的阈值细粒含量FCth 半经验公式预测能力.基于理想二元介质材料的理论最小孔隙比计算方法,提出确定中间性态土颗粒接触状态临界条件参量FCin-min 和FCin-max的方法,分析各参数对FCin-min 和FCin-max 的影响规律,建立基于基本物理性能指标的FCin-min 和FCin-max 预测方法,最终提出全FC范围(FC=0～100%)的砂-粉混合料各颗粒接触状态临界条件参量的有效评价方法.
Procedure for characterizing the critical particle contact state of sand-fines mixtures
Sand-fines mixtures are widely applied in key projects such as high-speed railway roadbeds,artificial is-land buildings,and submarine immersed tube tunnel cushions.Characterizing the complex particle contact state and mechanical behavior evolution of the sand-fines mixtures and disclosing their influence on the static/dynamic properties of the mixtures are one of critical and urgent scientific problems.The capability of the Rahman semiem-pirical formula to predict the threshold fines content FCth,which differentiates the regime of"fines in sand"(sand-dominated behavior)from"sand in fines"(fines-dominated behavior),is confirmed using the basic indexes of the physical properties and mechanical properties of the mixtures published in the literature.In this study,a new meth-od for determining the critical particle contact condition parameters FCin-min and FCin-max of in-transition soils is de-veloped based on the theoretical minimum void ratio calculation method of binary medium materials(binary packing model).The influencing laws of every parameter on FCin-min and FCin-max are analyzed,and the prediction meth-od for FCin-min and FCin-max is developed based on the basic physical performance index.Finally,an effective evalu-ation procedure of the critical condition parameters under every particle contact state of sand-fines mixtures in the full FC range(FC=0%～100%)is presented.

fines contentsand-fines mixtureparticle contact statethreshold fines contentcritical condition pa-rametertheoretical minimum void ratiobinary packing modelin-transition

吴琪、孙苏豫、杭天柱、赵凯、陈国兴

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南京工业大学 岩土工程研究所, 江苏 南京 210009

江苏省土木工程防震技术研究中心,江苏 南京 210009

细粒含量 砂-粉混合料 颗粒接触状态 阈值细粒含量 临界条件参量 理论最小孔隙比 二元介质模型 中间性态

国家自然科学基金项目国家自然科学基金项目国家自然科学基金项目国家重点研发计划

5200820651978334516082672018YFC1504301

2024

10.11990/jheu.202108020

哈尔滨工程大学学报
哈尔滨工程大学

哈尔滨工程大学学报

CSTPCD北大核心
影响因子：0.655
ISSN：1006-7043
年,卷(期)：2024.45(2)
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