| 基于可靠度方法的全基质吸力段土-水特征模型研究 |
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| 引用本文： | 刘青灵,简文彬,许旭堂,聂闻.基于可靠度方法的全基质吸力段土-水特征模型研究[J].水文地质工程地质,2022,49(1):92-100. |
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| 作者姓名： | 刘青灵 简文彬 许旭堂 聂闻 |
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| 作者单位： | 1.福州大学紫金矿业学院，福建 福州 350116 |
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| 基金项目： | 国家自然科学基金项目(41861134011;U2005205);福建省中青年教师科研项目(JAT190001)。 |
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| 摘 要： | 土-水特征曲线是非饱和土入渗和流-固耦合分析的基础,目前该模型的研究成果由于试验方法和设备的局限,仅能够得到局部基质吸力段(低吸力或高吸力)的土-水特征曲线;而如何根据局部试验数据集推断与试验结果相吻合的全基质吸力段范围的土-水特征曲线是一个难题。对东南沿海广泛分布的原状残积土进行了不同基质吸力段的土-水特征试验。根据残积土低吸力段和高吸力段的试验数据,运用可靠度分析方法,从土壤孔隙微元破裂失稳的角度,建立了土壤全基质吸力段的土-水特征模型。根据UNSODA2.0数据库提取砂土、粉土、黏土等3种类型土样本(52个)的试验数据,讨论了模型参数意义和不同土类的模型适用性,进行了不同土-水特征模型的比较分析。对比验证研究表明,形状参数σ和中值比例参数μ使提出的模型具有很强的适应性,并且具有依据局部试验数据(低或高基质吸力段)快速获得全基质吸力段土壤土-水特征曲线的能力。与其它模型相比,模型计算过程适应性强,模型决定系数R2>0.98。研究结果对快速获取不同类型土壤的全基质吸力段土-水特征曲线具有参考价值。
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| 关 键 词： | 土-水特征模型 基质吸力 残积土 全基质吸力段 可靠度 |
| 收稿时间： | 2021-02-02 |
A study of the soil-water reliability model in the whole matric suction range |
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| LIU Qingling,JIAN Wenbin,XU Xutang,NIE Wen.A study of the soil-water reliability model in the whole matric suction range[J].Hydrogeology and Engineering Geology,2022,49(1):92-100. |
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| Authors: | LIU Qingling JIAN Wenbin XU Xutang NIE Wen |
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| Affiliation: | 1.College of Zijin Mining, Fuzhou University, Fuzhou, Fujian 350116, China2.College of Enviroment and Resources, Fuzhou University, Fuzhou, Fujian 350116, China3.College of Transportation and Civil Engineering, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350116, China4.Quanzhou Institute of Equipment Manufacturing, Haixi Institute, Chinese Academy of Sciences, Quanzhou, Fujian 362200, China |
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| Abstract: | Soil–water characteristic curves(SWCCs)are considered as a basis for analyzing fluid–solid coupling of unsaturated soil.How to estimate the SWCC over the whole region with matric suction based on the limited local datasets is challenging.Laboratory test is separately carried out on the ranges with low and high matric suctions of the undisturbed residual soil widely distributed in southeast China.With the test data,a model for SWCCs of soil in the whole range with matric suction is established by applying the reliability analysis method.Through analysis and verification based on the test data and data of 52 samples of three types of soil(sand,silt-loam and clay)obtained from UNSODA,it is found that the model parameters involved in the model show significant physics meaning.The model can be used to estimate the SWCC of soil within the whole range with matric suction according to part of the data(in the low or high matric suction part).Compared with the other models,the model is robust and is applicable for acquiring SWCCs of different types of soil within the whole range matric suction with R2>0.98.In addition,the model provides an important method to obtain SWCCs of soils with different texture,and is of the reference significance to the geotechnical AI analysis. |
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| Keywords: | soil water characteristic curve residual clay matric suction fully matric suction reliability |
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