摘要
粗粒土是工程建设过程中经常遇到的一类土,由于室内仪器限制,通常将其按一定条件缩尺后进行室内大三轴试验,进而推算原级配土的强度特性。缩尺后替代级配与原级配存在着缩尺条件、尺寸效应等问题。在某高速公路大三轴试验数据基础上,运用PFC2D软件,将600×300 mm样本经等质量替代法缩尺,比较了缩尺后不同尺寸样本的应力-应变曲线。结果表明:PFC2D可以很好的模拟三轴试验;缩尺后的样本应变模量降低,且随着样本尺寸的增大而增大,样本的抗剪强度也存在差异;等质量替代法对缩尺后样本的尺寸大小有限制;当样本颗粒级配相同时,不同尺寸样本在峰前阶段的尺寸效应不明显。
Coarse-grained soils are the soils that always are encountered in the process of engineer-ing construction.Due to indoor instrument limitations,Triaxial tests were performed under certain scale conditions and then the paper calculate the strength properties of original soil gradation.There are prob-lems of size effects and scale conditions between natural gradation and substitute gradation.According to the triaxial test data of some highway ,the sample of 600 ＆#215;300 mm will be scaled and the paper will com-pare stress-strain curves of samples of different sizes.The conclusions are as follows：PFC2D can simu-late triaxial tests accurately;Strain modulus decrease in the scale samples,and increase with the increas-ing of sample size;Shear strength of samples are different;the method of equal-weight replacement is limited to the size of the scaled samples;when the particles’size distribution is same ,different samples haven’t obvious size effects.In coarse-grained soil sample preparation process.
出处
《公路工程》
北大核心
2014年第2期80-83,162,共5页
Highway Engineering
基金
地质灾害防治与地质环境保护国家重点实验室开放基金项目(GZ2009-21)
国家自然科学基金青年基金项目(41302218)联合资助
关键词
粗粒土
尺寸效应
大三轴试验
PFC2D
coarse-grained soils
PFC2D
size effects
triaxial test
