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Geomechanics and Engineering Volume 20, Number 1, January10 2020 , pages 19-28 DOI: https://doi.org/10.12989/gae.2020.20.1.019 |
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Impact of spatial variability of geotechnical properties on uncertain settlement of frozen soil foundation around an oil pipeline |
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Tao Wang, Guoqing Zhou, Jianzhou Wang and Di Wang
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| Abstract | ||
| The spatial variability of geotechnical properties can lead to the uncertainty of settlement for frozen soil foundation around the oil pipeline, and it can affect the stability of permafrost foundation. In this paper, the elastic modulus, cohesion, angle of internal friction and poisson ratio are taken as four independent random fields. A stochastic analysis model for the uncertain settlement characteristic of frozen soil foundation around an oil pipeline is presented. The accuracy of the stochastic analysis model is verified by measured data. Considering the different combinations for the coefficient of variation and scale of fluctuation, the influences of spatial variability of geotechnical properties on uncertain settlement are estimated. The results show that the stochastic effects between elastic modulus, cohesion, angle of internal friction and poisson ratio are obviously different. The deformation parameters have a greater influence on stochastic settlement than the strength parameters. The overall variability of settlement reduces with the increase of horizontal scale of fluctuation and vertical scale of fluctuation. These results can improve our understanding of the influences of spatial variability of geotechnical properties on uncertain settlement and provide a theoretical basis for the reliability analysis of pipeline engineering in permafrost regions. | ||
| Key Words | ||
| foundations; spatial variability; geotechnical properties; settlement; permafrost regions | ||
| Address | ||
| Tao Wang, Guoqing Zhou, Jianzhou Wang and Di Wang: State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China | ||