水利水电技术（中英文）2023，Vol.54Issue(12)：23-34,12.DOI:10.13928/j.cnki.wrahe.2023.12.003
内陆河湖相软土土性指标统计特征与竖向变化规律研究
Study on statistical characteristics and vertical change law of soil index for soft soil in the inland fluvial-lacustrine sediments
摘要
Abstract
[Objective]Inland fluvial lacustrine soft soil is easy to be confused with coastal soft soil.Its engineering characteris-tics and identification criteria have important guiding value for the treatment and settlement stability control of this kind of soft soil foundation.[Methods]Aiming at the problems that the identification index and scope of existing inland fluvial-lacustrine soft soil are not clear,and the research on vertical change law of soil index is insufficient,based on the geotechnical test data collected from nearly 3000 groups of inland fluvial-lacustrine soft soils in different regions of China,a series of studies were carried out on the statistical characteristics,identification indexes and vertical change law.[Results]The statistical result show that the natural moisture content,the void ratio,the compression coefficient of inland fluvial lacustrine soft soil are all less than the corresponding value of marine soft soil,while its density and the quick shear cohesion are higher than the corresponding indexes of marine soft soil,but this type of soft soil still the basic characteristics of general soft soil on the whole,such as higher natural water content,smaller density,larger pore ratio and lower shear strength.As the five identification indexes of inland fluvial-lacustrine soft soil,the natural water content,the void ratio,the plasticity index,the compressive modulus and the compressibility coefficient all obey the log-normal distribution,and the corresponding identification criteria is given(w ≥ 28.1、e≥0.81、Ip≥ 11.5、Es≤6.5、α0.1-0.2 ≥0.23).From the vertical change law of soil index,the natural water content,the void ratio,the compressi-bility coefficient,the plastic index,the plastic limit and the liquid limit with depth generally increase first and then decrease,while the natural density,the quick shear cohesion,the internal friction angle and the compressive modulus change with the depth firstly decrease and then increase.On the other hand,the average value and standard deviation of the plasticity index de-creased linearly with depth,and the average value and standard deviation of the quick shear cohesion increased linearly with depth.[Conclusion]The result show that the soil index characteristics of inland fluvial-lacustrine soft soil are somewhat different from those of marine soft soil.Compared with marine soft soil,its mechanical properties are slightly more favorable,and it has the characteristics of uneven stratification along the depth direction.The research result can provide references for the treatment and settlement control of this kind of soft soil foundation.关键词
内陆河湖相软土/鉴别指标/统计分析/土性指标/竖向变化规律/力学性能/影响因素/变形Key words
inland fluvial-lacustrine soft soil/identification index/statistical analysis/soil index/vertical change law/mechani-cal properties/influencing factors/deformation分类
建筑与水利引用本文复制引用
裘友强,张留俊,富志鹏,刘军勇,张微,王超..内陆河湖相软土土性指标统计特征与竖向变化规律研究[J].水利水电技术（中英文）,2023,54(12):23-34,12.基金项目
国家重点研发计划课题(2021YFB2600103,2021YFB2600402,2016YFC0802203) （2021YFB2600103,2021YFB2600402,2016YFC0802203）
四川省交通运输科技项目(2019-ZL-19) （2019-ZL-19）
陕西省科协青年人才托举计划资助项目(CLGC202206) （CLGC202206）
