Rheological Behaviors of Structural Soft Soil in Dongting Lake Area
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ORIGINAL PAPER
Rheological Behaviors of Structural Soft Soil in Dongting Lake Area Hui Hu . Bowen Zhang . Wen Yu . Lifang Lu . Chunmei Zhang . Tianxin Niu
Received: 13 December 2019 / Accepted: 4 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract Thick soft soil layers are widely distributed in inland lake areas and southeast coastal regions in China and the natural soft soil shows entirely different characteristics with remoulded soil due to the existence of structural characteristic. The structural characteristics of soft soil have been a research focus and difficult problem in geotechnical engineering and engineering practice. By taking the structural soft soil in Dongting Lake area as the research object, the indoor one-dimensional (1D) consolidation rheological test was conducted to fit and analyze the test data. Moreover, the analytical solution under the 1D consolidation was deduced according to fitted rheological constitutive model to reveal the rheological behaviors of structural soft soil under different stress levels. The research results showed that the soft soil of the lake area has a stress threshold. The threshold is 0 at a low stress level, and the rheological behavior of soft soil complies with the law of Schiffman model and soft soil has a low consolidation rate. At a high stress level, the stress threshold is close to a constant and in this context, the rheological behavior of soft soil conforms to the law of H. Hu (&) B. Zhang L. Lu C. Zhang T. Niu Zhangjiakou Vocational and Technical College, Zhangjiakou 075000, Hebei, China e-mail: [email protected] W. Yu Hebei Institute of Architectural Engineering, Zhangjiakou 075000, Hebei, China
Nishihara model with a rapid consolidation rate of soft soil. The consolidation rate of the soft soil in the lake area accelerates with the increase of the stress threshold while slows down with the growth of prestressed loads. Therefore, it can be concluded that different settlement calculation methods need to be used according to the imposed loads during the engineering construction in the lake area with structural soft soil. Keywords Lake area Structural soft soil Rheological behavior Consolidation rheological test
1 Introduction Soft soil exhibits different rheological behaviors due to the disparities of the formation process, material compositions and internal structures. Thus, numerous experts and scholars carry out relevant research on soft soil in different regions. For instance, the indoor onedimensional (1D) consolidation creep test was conducted to investigate the law of creep deformation of mucky soft clay in the coast and established the nonlinear rheological constitutive model reflecting soft clay in the coast (Wang et al. 2009). By taking the mucky silty clay as the research object and based on a simplified modeling method of non-linear rheological model, the non-linear creep model of mucky silty clay was established according to the result of triaxial
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