摘要
粗粒土强度变形特性与初始级配和制样干密度密切相关。为研究不同级配和密度组合的粗粒料强度变形特性,提出了一种计算简便、易于推广的粗粒土骨架孔隙比计算方法。开展的室内试验结果表明,该计算方法所得的骨架孔隙比与粗粒土力学特性之间存在较为明显的单调性变化规律。当试样尺寸一致时,随着骨架孔隙比减小,破坏剪应力增大,破坏摩擦角增大,黏聚力减小;平均初始切线弹性模量增大,平均初始切线泊松比减小。整体而言,骨架孔隙比越小,粗粒土强度、刚度越大。基于该结论,笔者提出了一种等骨架孔隙比粗粒土缩尺方法。
The strength and deformation characteristics of coarse-grained soil are closely related to the initial gradation and dry density during specimen preparation.To study the strength and deformation characteristics of coarse-grain materials with different gradations and densities,a simple and generalized method for calculating the skeleton void ratio of coarse-grained soil is proposed.The results of laboratory tests show that there is an obvious monotonic variation between the skeleton void ratio obtained by this calculation method and the mechanical properties of coarse-grained soil.When the specimen size is consistent,with the decrease of the skeleton void ratio,the failure shear stress increases,the failure friction angle increases,and the cohesion decreases.Also,as the skeleton void ratio decreases,the average initial tangent elastic modulus increases and the average initial tangent Poisson's ratio decreases.On the whole,the smaller the skeleton void ratio,the greater the strength and stiffness of the coarse-grained soil.Based on this,a scaling method of coarse-grained soil with equivalent skeleton void ratio is proposed in this paper.
作者
潘家军
孙向军
左永振
王俊鹏
卢一为
韩冰
PAN Jia-jun;SUN Xiang-jun;ZUO Yong-zhen;WANG Jun-peng;LU Yi-wei;HAN Bing(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan,Hubei 430010,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2023年第8期2186-2194,共9页
Rock and Soil Mechanics
基金
国家自然科学基金(No.51979010,No.U21A20158)
中央级公益性科研院所基本科研业务费项目(No.CKSF2021484/YT)。
关键词
粗粒料
骨架孔隙比
强度变形特性
缩尺方法
coarse-grained soil
skeleton void ratio
strength and deformation characteristics
scaling method
