摘要
本文利用扁铲侧胀试验对超固结砂土的土力学参数进行测试,目的是获取砂土的超固结比OCR和静止土压力系数k 0。经过一系列室内试验箱砂土物理模型试验的精确测试,分别得到在加载和卸载阶段的P 0压力值和P 1压力值,并换算成各项扁铲侧胀试验指标。试验结果表明,在扁铲侧胀试验指标中,侧胀水平应力指数K D更能反映粗颗粒砂土的超固结比,因此,可用相对密实度D r和侧胀水平应力指数K D建立超固结比OCR的表达式;由于K D/k 0和E D/σ′m之间有共同的因子,即状态参数ψ,因此可建立两者的关系式来计算静止土压力系数k 0。
In this work,the geotechnical parameters of over-consolidated sands were measured by the flat dilatometer test(DMT),focusing on the over-consolidation ratio and static lateral pressure coefficient of sands.A series of large calibration chamber tests were performed to determine the P 0 and P 1 pressure values in loading and unloading stages.The test results show that,among DMT indices,the horizontal stress index K D strongly reflects the over-consolidation effect of coarse grains of sands.Therefore,the expression of over-consolidation ratio(OCR)can be established as a function of relative density and horizontal stress index K D.Additionally,the relationship between K D/k 0 and E D/σ′m can be established to estimate k 0 because both parameters have a common factor,which is the state parameter.
作者
胡永波
HU Yongbo(Shaanxi Railway Engineering Survey Co.,Ltd.,Xi an,Shaanxi 710000)
出处
《地质与勘探》
CAS
CSCD
北大核心
2020年第4期862-869,共8页
Geology and Exploration
关键词
扁铲侧胀试验
静止土压力系数
超固结比
粗颗粒砂土
flat dilatometer test(DMT)
coefficient of static earth pressure
over-consolidation ratio
coarse-grained sand
