CPTU技术在黏性土不排水抗剪强度计算中的应用研究

以江苏江海高速公路的黏性土为例，采用孔压静力触探技术（CPTU）对该场地黏性土进行土层测试与不排水抗剪强度的计算研究。结合现场十字板剪切试验，反演该场地黏性土CPTU的三种圆锥系数。最后，以反演的总锥尖圆锥系数（Nk=15.9）来计算该场地其他位置处黏性土的不排水抗剪强度。结果表明:在确定场地圆锥系数的前提下，以CPTU技术来计算黏性土的不排水抗剪强度是可靠的。

Study on Application of CPTU Technology in Undrained Shear Strength Calculation of Clayey Soil

Taking the clayey soils of Jianghai expressway in Jiangsu Province as an example, testing of the soil layer in the site and evaluating the undrained shear strength of clayed soil by CPTU were carried out. Based on the field vame shear test, three CPTU cone factors of clayey soils are analyzed. Finally, the undrained shear stength of clayey soils at other locations in the same site is evaluated by the cone factor of total cone tip (Nk=15.9). Under the premise of determining the cone tip of the site, it is reliable to evaluate the undrained shear strength of clayey soils by CPTU technology, which can be used as good reference for evaluating undrained shear strength of other sites.