Abstract:There are two possible extreme opinions in terms of Hypotheses A and B: Hypothesis A assumes that creep occurs after the consolidation for both laboratory specimen and in-situ condition, whereas Hypothesis B assumes creep occurs during and after the “primary” consolidation. A new simplified method is proposed to calculate the consolidation settlement of clayey soils with creep subjected to the multi-staged ramp loading. The parameters of the new simplified method have the clear physical meanings, and it is easy to be used. With the help of the “equivalent time” concept, both normally consolidated state and over-consolidated state of clayey soils can be considered in the new simplified method. A typical project in Sweden was selected as a multilayered soil profile. The calculated results of the new simplified method offer a good estimation of the settlement by comparing with the results from the finite element analysis and 46 years’ recorded settlement data.
殷建华, 冯伟强. 蠕变黏性土固结沉降计算的新简化方法及验证[J]. 岩土工程学报, 2019, 41(S2): 5-8.
YIN Jian-hua, FENG Wei-qiang. New simplified method for calculating consolidation settlement of clayey soils exhibiting creep and its verification. Chinese J. Geot. Eng., 2019, 41(S2): 5-8.
[1] LADD C C, FOOTT R, ISHIHARA K, et al.Stress-deformation and strength characteristics. state-of the-art report[C]// Proc 9th Int Conf Soil Mech Found Engng. Tokyo, 1977, 2: 421-494. [2] YIN Jian-Hua, GRAHAM James.Elastic visco-plastic modelling of one-dimensional consolidation[J]. Géotechnique, 1996, 46(3): 515-527. [3] BJERRUM L.Engineering geology of Norwegian normally- consolidated marine clays as related to settlements of buildings[J]. Géotechnique, 1967, 17(2): 83-118. [4] 殷建华. 从本构模型研究到试验和光纤监测设备研发. 岩土工程学报, 2011, 33(1):1-15. (YIN Jian-hua.From constitutive modeling to development of laboratory testing and optical fiber sensor monitoring technologies. Chinese Journal of Geotechnical Engineering, 2011, 33(1): 1-5. (in Chinese)) [5] YIN Jian-Hua, FENG W Q.A new simplified method and its verification for calculation of consolidation settlement of a clayey soil with creep[J]. Canadian Geotechnical Journal, 2016, 54(3): 333-347. [6] FENG W Q, YIN J H.A new simplified Hypothesis B method for calculating consolidation settlements of double soil layers exhibiting creep[J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2017, 41(6): 899-917. [7] ZHU Guo-fu, YIN Jian-hua.Consolidation of double soil layers under depth-dependent ramp load[J]. Géotechnique, 1999, 49(3): 415-421. [8] LARSSON R, MATTSSON H.Settlements and shear strength increase below embankments[R]. Geotechnical Institute Report, 2003: 63. [9] HOLTZ R D, BROMS, B.Long-term loading tests at Ska-Edeby, Sweden[C]// Proc of ASCE Spe Conf Perf of Earth Sup Structures. Lafayette, 1972: 273-284.