湿陷性黄土微观颗粒力学特性研究  

Mechanical characteristics of microscopic particles of collapsible loess

作　　者：王志强 Wang Zhiqiang(STECOL Corporation of Power China,Tianjin 300384,China)

机构地区：[1]中国电建市政建设集团有限公司,天津300384

出　　处：《山西建筑》2022年第21期71-73,共3页Shanxi Architecture

摘　　要：为了深入研究黄土细微观力学特性,采用基于离散单元法的PFC颗粒流数值模拟软件,模拟开展了不同围压条件下湿陷性黄土的常规三轴剪切实验,分析了围压对黄土试样的强度及应力-应变特性的影响。结果表明:围压对黄土的强度与力学特性影响明显,随着围压的增加,试样应力-应变曲线斜率和峰值明显增大,弹性模量随着围压的增加而增加;三轴压缩峰值强度与围压保持正线性相关,且拟合程度较高;随着围压的增加黄土试样体应变曲线不断下降,试样发生剪缩现象且随着围压的增加剪缩程度明显增大。In order to have the deep research on the microscopic mechanical characteristics of loess,the paper adopts the PFC grain flows numeric simulation software based on the discrete element moethod,simulates the conventional triaxial shear tests of the collapsible loess under different confining pressure,analyzes the influence of the confining pressure on the strength and mechanical characters of the loess,indicates the slope of the stress-strain curve and peak value increase dramatically with the added confining pressure,and the elasticity modulus also increases along with the added confining pressure;the triaxial contracted peak value strength is related to the kept positive linear of the confining pressure with higher fitting degree;with the falling loess smaple strain curve under added confining pressure,the shear shrinkage happens to the samples and the shear shrinkage increases evidently with added confining pressure.

关 键 词：湿陷性黄土 PFC数值模拟 力学特性分析 三轴实验 

分 类 号：TU444[建筑科学—岩土工程]