Classification of soft clay in Jiangsu Province based on piezocone penetration tests
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摘要: 基于江苏地区典型软土的孔压静力触探（CPTU）测试数据,对江苏地区软土分类进行研究。分析对比国际上常用的CPTU土分类方法,分别采用SBT（soil behavior type）分类方法和Ic（土类指数）分类方法,对江苏地区的苏北滨海相,里下河泻湖相,长江三角洲冲积相和太湖冲湖积相等软土进行土分类。分类结果表明,CPTU原位测试可以有效识别江苏地区典型软土进行土分类,SBT土分类结果与Ic土分类结果具有良好的一致性,Ic土分类图中不同土类之间的分界线更为明显。Abstract: The classification results of soft soils in Jiangsu Province are derived through the CPTU data. The soil classification methods based on the CPTU data are reiviewed, then the SBT (soil behavior type) method and the Ic (soil index) method are chosen to identify the soft soils in Jiangsu province, including Northern Jiangsu marine clay, Lixiahe lagoon clay, Yangtze Delta alluvial clay and Taihu alluvial clay. The soil classification results show that the CPTU data can be used to effectively recognize the typical soft soils in Jiangsu province, and the SBT results are consistent with Ic results. Morever, the boundary between different soil types is more obvious in Ic soil classification chart.
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图 4 基于CPTU测试的苏北滨海相软土分类结果
Figure 4. Soil classification of Northern Jiangsu marine clay based on CPTU data
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图 5 基于CPTU测试的里下河泻湖相软土分类结果
Figure 5. Soil classification of Lixia lagoon clay based on CPTU data
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图 6 基于CPTU测试的长江三角洲冲积相软土分类结果
Figure 6. Soil classification of Yangtze Delta alluvial clay based on CPTU data
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图 7 基于CPTU测试的太湖冲湖积相软土分类结果
Figure 7. Soil classification of Taihu alluvial clay based on CPTU data
表 1 江苏区域典型软土的Ic值
Table 1 Typical values of Ic of soft soils in Jiangsu province
软土区域 Ic值范围 苏北滨海相软土 3.12< Ic <3.42 里下河泻湖相软土 2.92< Ic<3.32 长江三角洲冲积相软土 2.84< Ic<3.12 太湖冲湖积相软土 2.74< Ic <2.98 
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