摘要
选取吉林省敦化市江源镇的半纤维草炭土和高分解草炭土,通过室内快剪和固结快剪试验,分析了季冻区纤维草炭土直剪特性及其力学机理。结果表明:草炭土快剪试验的法向应力与峰值剪应力的关系曲线呈线性,符合摩尔-库伦定律。固结快剪试验的法向应力与峰值剪应力的关系曲线以法向应力200kPa为分段转折点,呈两段直线形式;基于摩尔-库伦强度准则建立了相应分段函数,得到了符合草炭土固结快剪规律的表达式。所得直剪特性及强度参数可为季冻区草炭土路基稳定性评价参数取值提供参考。
Hemic turfy soil and sapric turfy soil were selected from Jiangyuan Town,Dunhua City,Jilin Province as samples to analyze their direct shear characteristics and mechanical mechanism in seasonal frozen region by indoor fast shear and consolidated-fast shear experiments.The test results demonstrated that the relation curve between normal stress and peak of the shear stress was linear that conforming to Mohr-Coulomb criterion.The relation curve was a two-section line with a turning point at normal stress 200 kPa.Based on the Mohr-Coulomb criterion,the piecewise function was established,and the improved formula in accordance with the change rule of turfy soil was obtained.The obtained direct shear characteristics and strength parameters can be used as reference for the parameters valuing of subgrade stability evaluation in seasonal frozen region.
作者
徐燕
胡天明
孙炜
高俊鹏
XU Yan;HU Tianming;SUN Wei;GAO Junpeng(Construction and Engineering College,Jilin University,Changchun 130012,China)
出处
《人民长江》
北大核心
2019年第9期209-213,共5页
Yangtze River
基金
国家自然科学基金资助项目(41572254)
国家自然科学基金青年基金资助项目(41702300)
关键词
草炭土
纤维含量
直剪特性
快剪试验
固结快剪试验
SEM图像
turfy soil
fiber content
direct shear characteristics
quick direct shear test
consolidated-quick shear test
SEM image
