Prediction of the long-term settlement of the structures built on a reclaimed coral reef island: an aircraft runway
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ORIGINAL PAPER
Prediction of the long-term settlement of the structures built on a reclaimed coral reef island: an aircraft runway Dawei Yu 1,2 & Jianhong Ye 2
&
Leihua Yao 1
Received: 9 November 2019 / Accepted: 26 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Airport runways built on reclaimed coral calcareous sand foundation on coral reef islands is a type of important infrastructure for marine science observation, marine disaster relief, and marine supplies. Creep behavior of coral calcareous sand foundation under long-term loading applied by overlying structures could cause continuous foundation settlement; and excessive settlement may affect the normal service ability of airport runways built on coral reef islands. In this study, it is aimed to predict the long-term settlement of an airport runway built on a reclaimed coral reef island in the South China Sea (SCS) adopting a finite element method. Firstly, two improved Burgers creep models are proposed based on some laboratory triaxial test results; and then, they are embedded into the finite element software ABAQUS using the User Material Subroutine (UMAT) interface. Secondly, the two proposed improved Burgers creep models are validated by a series of triaxial creep tests for the coral calcareous sands sampled from a reclaimed coral reef island in SCS. Meanwhile, the parameters describing the creep behavior of the coral calcareous sands in SCS are calibrated for the subsequent numerical analysis. Thirdly, the long-term settlement of an airport runway built on a reclaimed coral reef island in SCS is numerically predicted adopting the two proposed improved Burgers creep models and the calibrated parameters. The computational results show that the settlement of the airport runway is in the range of 6.7 to 19.9 mm in the future 50 years, satisfying the requirement of Chinese design code MH/T 5027-2013. Finally, parametric analysis is performed to screen the significance and sensitivity of the parameters describing the creep behavior of the coral calcareous sands. Keywords Long-term settlement . Reclaimed coral reef islands . Improved Burgers creep model . Aircraft runway on coral reef island . Creep of coral sands
Introduction Airport runways built on reclaimed coral calcareous sand foundation on the top of natural coral reef islands can provide great convenience for the marine observation, marine rescue and marine supplies. In the period of World War II, an airport runway had been built by the USA on Guam which was an island consisting of volcanic formations, limestone
* Jianhong Ye [email protected]; [email protected] 1
School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China
2
State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China
formations, and coral reef limestone formations. In December 2007, an aircraft runway with a length 1150 m firstly was successfully c
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