Local Softening Characteristic of Soft Clay Subjected to Dynamic Loading Under Low Confining Pressure
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TECHNICAL NOTE
Local Softening Characteristic of Soft Clay Subjected to Dynamic Loading Under Low Confining Pressure Peng Lin . Shanbo Jiao . Ankit Garg . Suriya Ganesan . Jitendra Singh Yadav
Received: 8 August 2019 / Accepted: 10 April 2020 Ó Springer Nature Switzerland AG 2020
Abstract In this study, the local softening characteristic of saturated soft clay was examined through a series of dynamic triaxial test under varying confining pressures. Additionally, the stress strain relationship and pore water pressure development during the process of softening zone formation were recorded. Using the energy based pore pressure model, it has been seen that the pore water pressure and energy dissipation has very good correlation for saturated sands and silty soils. The experimental results prove that the local softening and the development of pore water pressure have a good correlation. The different dynamic stress makes the soil sample to reach the same damage level. The softening area made by the smaller dynamic stress is more clear and concentrated than larger stress. P. Lin S. Jiao A. Garg S. Ganesan Department of Civil and Environmental Engineering, Shantou University, Shantou, China e-mail: [email protected] S. Jiao e-mail: [email protected] A. Garg e-mail: [email protected] S. Ganesan e-mail: [email protected] J. S. Yadav (&) Department of Civil Engineering, National Institute of Technology Hamirpur, Hamirpur, India e-mail: [email protected]
Keywords Low confining pressure Saturated soft clay Dynamic triaxial test Softening area Energybased pore pressure
1 Introduction It is well known that mucky soft soil is characterized by high moisture content, high stagnant water, high thixotropy and solid structure. These soil properties will create enormous changes. Specifically, the phenomenon of soil softening is one of the most pivotal aspects of soil failure. Some researchers conducted broad research on understanding of dynamic behavior of soft clay by controlling the dynamic stress amplitude, consolidation ratio and number of cycles (Wathugala and Desai 1993a, b; Desai et al. 1997; Desai 2010; Paul et al. 2014; Chen et al. 2014; Ghayoomi et al. 2017). Seed and Chan (1961) had discussed about the dynamic properties of soil. The considerable impact of various stress paths on cohesive soil’s plastic deformation was studied (Monismith et al. 1975). Meanwhile, an empirical accumulative plastic strain model was proposed based on the test outcomes. It was found that the plastic strain of remold soil was smaller than the original state soil under cyclic loading (Ansal and Erken 2008). The axial strain and confining pressure werelinear under different confining pressures through the uniaxial cyclic triaxial test (Gu et al.
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2016). Jiang and Cai (2012) contemplated the degradation of stiffness using the normal consolidated saturated soft clay. Additionally, they set up a reasonable mathematical model of the strain-soften
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