The undrained shear strength is an important physical property of clayey soils and is also very valuable to the design of subway. According to the difficulty and cost constraint of obtaining the undisturbed samples of high quality,a modern in-situ test was commonly applied to evaluate the undrained shear strength. In the case study of Ningbo Subway,the piezocone penetration test( CPTU) was used to test and evaluate the clayey soil. Firstly,the basic operation principles of piezocone penetration test were in...
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