摘要
粗粒土的初始结构对其宏观抗剪强度及剪切过程中的强度演化有着重要影响,为研究粗粒土初始结构强度以及初始结构在剪切过程中对抗剪强度的贡献,采用可视化直剪仪研究土体宏观抗剪强度中颗粒的初始结构所抵抗的剪应力数值,得出粗粒土初始结构所抵抗的剪应力约占整体抗剪强度的1/3。针对颗粒形态、排列、接触关系等颗粒初始结构特征指标,分析初始结构前后各指标的变化规律,并采用AHP以及熵权法综合评价各因素对初始结构效应的影响权重,得到各个指标对粗粒土初始结构效应的权重大小。研究表明:颗粒接触关系对初始结构效应影响最大,其权重占比为42.66%,其次为颗粒整体轮廓系数,其权重占比为26.02%。
The initial structure of coarse-grained soil has a great influence on its macroscopic shear strength and the strength evolution during shearing.In order to study the initial structural strength of coarse-grained soil and the contribution of the initial structure to the shear strength in the shearing process,a visualized direct shear apparatus was used to investigate the shear stress value contributed by the initial structure of the particles in the macroscopic shear strength of the soil.It is concluded that the shear stress resisted by the initial structure of the coarse-grained soil accounted for about one-third of the overall shear strength.Then the variations of the particle initial structure characteristic indices,such as particle shape,arrangement and contact relationship were analyzed before and after the initial structure was deconstructed,and the influence weight of each index on the initial structure effect was evaluated and ranked using AHP-weight entropy method.The results show that the particle contact relationship had the greatest influence on the initial structure effect,and its weight accounted for 42.66%,followed by the overall particle profile coefficient,which accounted for 26.02%.
作者
王洋
魏玉峰
黄鑫
贺琮栖
梁彭
WANG Yang;WEI Yufeng;HUANG Xin;HE Congxi;LIANG Peng(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《水资源与水工程学报》
CSCD
北大核心
2022年第1期190-198,共9页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(42072303)。
关键词
粗粒土
初始结构
抗剪强度
AHP-熵权法
coarse-grained soil
initial structure
shear strength
AHP-entropy weight method
