Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (10): 2851-2859.doi: 10.16285/j.rsm.2023.0698

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Joint laboratory and in-situ calibration of strength characteristics for Taizhou coastal soft clay

WANG Kuan-jun1, JIA Zhi-yuan2, SHEN Kan-min1, TANG Yan3   

  1. 1. POWERCHIHA Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 311122, China; 2. College of Civil and Transportation Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 3. Zhejiang Engineering Research Center of Marine Geotechnical Investigation Technology and Equipment, Zhejiang Huadong Geotechnical Investigation & Design Institute Corporation Limited , Hangzhou, Zhejiang 310014, China
  • Received:2023-05-30 Accepted:2023-07-17 Online:2023-10-13 Published:2023-10-16
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (52108356, 52101334) and the Zhejiang Provincial Natural Science Foundation of China (LQ20E090001).

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Abstract:

The soft clay with low strength and high compressibility is widely distributed in the coastal area of China. The engineering characteristics evaluation of soft clay is crucial for engineering construction. Piezocone penetration test (CPTU) is one of the most commonly used in-situ testing methods, which has slight disturbance on soil. However, the mechanical properties of the soil requires interpretation of CPTU test results, which is site-specific. This paper presents a study conducted in the Taizhou coastal area to investigate the strength characteristics of deep soft clay through CPTU and laboratory tests. Based on the direct shear test (consolidated quick shear) results of reconsolidated Taizhou soft clay, the relationship between the normalized strength and overconsolidation ratio (OCR) of Taizhou soft clay was obtained, where the empirical coefficients a and b of the stress history and normalized soil engineering properties (SHANSEP) method were determined to be 0.226 and 0.761, respectively. The cone factor N kt of Taizhou soft clay were calibrated from 10.23 to 16.88, with a total mean value of 14.08. Utilizing the SHANSEP formula and the undrained shear strength su obtained by N kt method, a continuous section of the in-situ OCR of Taizhou soft clay was derived. The interpretation empirical coefficient k of different strata OCR were calibrated from 0.315 to 0.570, a value of k = 0.33 was recommended for interpreting the OCR of Taizhou soft clay.

Key words: soft clay, piezocone penetration test, overconsolidation ratio (OCR), joint calibration

CLC Number: 

  • TU192
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