Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (S2): 85-94.doi: 10.16285/j.rsm.2021.1940

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Discussion on overconsolidation ratio for underconsolidated soils

YUAN Jun-ping1, 2, CHEN Long1, 2, LIANG Yan3, DING Guo-quan1, 2, YIN Zong-ze1, 2   

  1. 1. Key Laboratory of Ministry of Education for Geotechnical and Embankment Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 2. Geotechnical Engineering Institute, Hohai University, Nanjing, Jiangsu 210098, China; 3. Hohai University Design Institute Co., Ltd., Nanjing, Jiangsu 210098, China
  • Received:2021-11-16 Revised:2022-07-21 Online:2022-10-10 Published:2022-10-03
  • Supported by:
    This work was supported by National Key R&D Program of China(2018YFC1508505).

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Abstract:

Underconsolidated soil is the soil that has not finished consolidation under its self-weight. At present, there are two types of overconsolidation ratio for underconsolidated soil in literature, i.e., equal to 1 and less than 1 respectively, which may cause confusion or misusing problems. We have sorted out the relevant contents of overconsolidation ratio in the widely used soil mechanics textbooks and found that there are two different definitions for overconsolidation ratio, where the different denominators result in the difference of overconsolidation ratio for underconsolidated soil. Using knowledge graph method, we comprehensively analyze the conceptual meaning, historical origin and practical applications for overconsolidation ratio and underconsolidated soil. Results show that degree of consolidation or consolidation state parameters can be used as substitution for overconsolidation ratio while involved in the problems related to underconsolidated soil. Overconsolidation ratio should be defined as the ratio of preconsolidation stress to existing effective stress (OCR = pc /p′0, pc is the effective consolidation pressure in the early stage, p′0 is the vertical effective stress), which is consistent with the influence mechanism of stress history on soil behavior, as well as the historical origin meaning of the concept.

Key words: underconsolidated soil, overconsolidation ratio, preconsolidation stress, stress history, knowledge graph

CLC Number: 

  • TU441
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