季节性冻土地区高速铁路路基冻融变形规律研究

doi:10.13722/j.cnki.jrme.2015.02.021

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Abstract To analyze the roadbed deformation distribution of high-speed railway(HSR) in seasonally frozen regions，thermo-elastic mathematical equations describing the stress and deformation of frozen roadbed were deduced considering ice and water phase transition. A finite element model was built，achieving continuous coupled calculation of geotemperature and deformation. Different frozen-heave ratios were adopted for the filling material along Harbin—Dalian HSR roadbed in deformation and stress analysis. The calculated vertical displacements，transverse deformation differences，horizontal displacements and tensile stress were found to increase with the frozen-heave ratios and frost depths. The calculated surface vertical displacements of roadbed are possible to exceed the allowed values of HSR standard. The calculated tensile failure occurrs in the section of roadbed shoulder and slope，indicating the possible occurrence of cracks. It is also indicated that the variation of the frozen-heave and the thaw-compression ratios caused by the water redistribution inside the roadbed under the action of geotemperature field are the main influencing factors to the deformation and stability of HSR roadbed.

Key words： soil mechanics seasonally frozen region high-speed railway roadbed deformation during freezing and thawing transverse deformation difference frozen-heave ratio

Received: 30 September 2013

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.02.021 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I12/2546

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