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Geomechanics and Engineering Volume 34, Number 3, August10 2023 , pages 303-316 DOI: https://doi.org/10.12989/gae.2023.34.3.303 |
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Seismic deformation behaviors of the soft clay after freezing-thawing |
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Zhen-Dong Cui, Meng-Hui Huang, Chen-Yu Hou and Li Yuan
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| Abstract | ||
| With the development and utilization of urban underground space, the artificial ground freezing technology has been widely used in the construction of underground engineering in soft soil areas. The mechanical properties of soft clay changed greatly after freezing and thawing, which affected the seismic performance of underground structures. In this paper, a series of triaxial tests were carried out to study the dynamic response of the freezing-thawing clay under the seismic load considering different dynamic stress amplitudes and different confining pressures. The reduction factor of dynamic shear stress was determined to correct the amplitude of the seismic load. The deformation development mode, the stress-strain relationship and the energy dissipation behavior of the soft clay under the seismic load were analyzed. An empirical model for predicting accumulative plastic strain was proposed and validated considering the loading times, the confining pressures and the dynamic stress amplitudes. The relevant research results can provide a theoretical reference to the seismic design of underground structures in soft clay areas. | ||
| Key Words | ||
| deformation mode; freezing-thawing; seismic load; soft clay | ||
| Address | ||
| Zhen-Dong Cui, Meng-Hui Huang, Chen-Yu Hou and Li Yuan: State Key Laboratory of Intelligent Construction and Healthy Operation & Maintenance of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China | ||