粗颗粒土缩尺方法及缩尺效应研究进展  

A Review of Downscaling Methods for Coarse Granular Soil and Their Effectiveness

作　　者：潘家军[1] 孙向军 PAN Jia-jun;SUN Xiang-jun(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China)

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,武汉430010

出　　处：《长江科学院院报》2023年第11期1-8,共8页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金面上项目(51979010);国家自然科学基金-联合基金重点项目(U21A20158);中央级公益性科研院所基本科研业务费项目(CKSF2021484/YT,CKSF2023318/YT)。

摘　　要：粗颗粒土作为土石坝的主要填筑材料,最大颗粒尺寸达到米级,室内试验试样只能进行缩尺。如何缩尺保证室内试验成果反映大坝实际填料的力学特性,一直是土石坝研究的难题。近年来大量学者就粗粒土的缩尺方法及缩尺效应开展了一系列卓有成效的研究工作,但在某些方面仍存在分歧。对现有粗颗粒土缩尺方法、试样试验边界效应、缩尺效应规律研究进行了系统总结和分析。最后,为解决粗颗粒土缩尺方法难题,介绍了长江科学院提出的一种粗颗粒土缩尺方法“旁压模量当量密度法”,阐明了“旁压模量相等”与“力学性质一致”的关系,诠释了“旁压模量当量密度法”的理论基础,为深入研究粗颗粒土缩尺方法提供了技术支撑。Coarse-grained soil,the primary material used in the filling of earth-rock dams,consists of particles with a maximum size reaching meter-level.However,indoor tests only allow for downscaled samples.Shrinking the scale while ensuring that the indoor test results accurately reflect the mechanical characteristics of the actual material has always been a challenge in the research of earth-rock dams.Despite significant progress in the research of downscaling methods for coarse-grained soil and their effectiveness in recent years,disagreements still exist in some specific aspects.We made a comprehensive summary and analysis of the existing methods for downscaling coarse-grained soil,as well as the boundary effects and scale effects in sample testing.Scholars in Changjiang River Scientific Research Institute present a method of downscaling coarse-grained soil by determining the density of specimens according to pressuremeter modulus equivalent to that of the actual material,which is called the method of“Equivalent Pressuremeter Modulus to Determine Density”.We further elucidate the relationship between equivalent pressuremeter modulus and consistency in mechanical properties,and expound the theoretical foundation of this method,providing technical support for researching the downscale methods for coarse granular soil.

关 键 词：粗颗粒土 级配缩尺方法 密实度控制标准 边界尺寸效应 旁压模量当量密度法 

分 类 号：TU414[建筑科学—岩土工程] TV641[建筑科学—土工工程]