摘要
提出利用路测仪为主要加压设备,渗透性良好的土工布为缓冲层的粉质土试样压实试验、渗透试验制备方法,以粉质土土料为样本,通过颗粒分析、标准击实和静力压实、抗剪强度、渗透及沉陷(压缩)试验,对水成粉质土的力学特性进行详细探讨。研究结果表明:(1)级配不良的粉质土的击实曲线存在多峰值现象,其压实性能不完全由试样的颗粒级配决定,与液限有关;(2)粉质土压实试样的内摩擦角在饱和度为50%～80%时变化不大,在其他区域内变化急剧;(3)粉质压实土兼有砂土和黏土的渗透性,其渗透系数随含砂量的增大而增大;(4)粉质压实土在荷载作用下绝大部分沉陷量在加荷后的短时间内产生,与其孔隙比关系不大,而与土体的矿物成分有关。
Using road tester as main loading instrument layer, the aqueous powdery soil from Puyang county in samples; and the mechanical characteristics of powdery and geotextile with good permeability as the cushioning alluvial champaign area by Yellow River is taken as test soil as bank or dam or roadbed reclamation material are researched roundly through particle size analysis, standard compaction test, static compaction test, shear strength test, seepage test, and compression test in laboratory. The research results indicate that： （1） Compaction curve of powdery soil with poor gradation has a multi-peak values phenomenon. Their compaction performance can＇t be decided by the particle gradation completely, also is related with liquefaction limit. （2） The internal friction angle changes of powdery soil is lesser when soil＇s saturation is between 50% and 80%, but it changes fiercely when its saturation is bigger than 80% or less than 50%. （3） Compacted powdery soil concurrently has the characteristics of sandy soil and clay. Penetration coefficient of powdery soil increases with silt content. （4） Under the load function, most of settlement for the compacted powdery soil occurs in a short time after the loads added, which is related with mineral components and has no significant relation with pore ratio.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2012年第A01期3333-3338,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51017386)
湖南省交通厅专项科研资助项目(200717)
关键词
土力学
水成粉质土
工程特性
试样制备方法
室内试验
soil mechanics
aqueous silty soil
engineering characteristics
specimen preparation method
laboratoryexperiment
