Geomechanics and Engineering

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Estimation of spatial autocorrelation variations of uncertain geotechnical properties for the frozen ground

  • Wang, Di (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology) ;
  • Wang, Tao (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology) ;
  • Xu, Daqing (Anhui Transport Consulting & Design Institute Co.,LTD) ;
  • Zhou, Guoqing (State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology)
  • Received : 2020.04.04
  • Accepted : 2020.07.21
  • Published : 2020.08.25
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Abstract

The uncertain geotechnical properties of frozen soil are important evidence for the design, operation and maintenance of the frozen ground. The complex geological, environmental and physical effects can lead to the spatial variations of the frozen soil, and the uncertain mechanical properties are the key factors for the uncertain analysis of frozen soil engineering. In this study, the elastic modulus, strength and Poisson ratio of warm frozen soil were measured, and the statistical characteristics under different temperature conditions are obtained. The autocorrelation distance (ACD) and autocorrelation function (ACF) of uncertain mechanical properties are estimated by random field (RF) method. The results show that the mean elastic modulus and mean strength decrease with the increase of temperature while the mean Poisson ratio increases with the increase of temperature. The average values of the ACD for the elastic modulus, strength and Poisson ratio are 0.64m, 0.53m and 0.48m, respectively. The standard deviation of the ACD for the elastic modulus, strength and Poisson ratio are 0.03m, 0.07m and 0.03m, respectively. The ACFs of elastic modulus, strength and Poisson ratio decrease with the increase of ratio of local average distance and scale of fluctuation. The ACF of uncertain mechanical properties is different when the temperature is different. This study can improve our understanding of the spatial autocorrelation variations of uncertain geotechnical properties and provide a basis and reference for the uncertain settlement analysis of frozen soil foundation.

Keywords

Acknowledgement

This research was supported by the Graduate Education Project of China University of Mining and Technology (Grant No.2019YJSJG042), the National Natural Science Foundation of China (Grant No. 51604265), the China Postdoctoral Science Foundation funded project (Grant No. 2019M660134) and the Major State Basic Research Development Program (Grant No. 2012CB026103). The authors wish to thank two anonymous reviewers and editor for their comments and advice.

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