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Research on coupled thermo-hydro-mechanical dynamic response characteristics of saturated porous deep-sea sediments under vibration of mining vehicle

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Applied Mathematics and Mechanics(English Edition) 2021年第9期42卷 1349-1362页

作者： Wei ZHU Xinyu SHI Rong HUANG Liyue HUANG Wenbo MA Post-doctoral Research Station of Statistics School of Mathematics and Computational ScienceXiangtan UniversityXiangtan 411105Hunan ProvinceChina School of Mathematics and Computational Science Xiangtan UniversityXiangtan 411105Hunan ProvinceChina School of Mathematic and Computational Science Hunan University of Science and TechnologyXiangtan 411201Hunan ProvinceChina College of Civil Engineering and Mechanics Xiangtan UniversityXiangtan 411105Hunan ProvinceChina

The excessive deformation of deep-sea sediments caused by the vibration of the mining machine will adversely affect the efficiency and safety of *** with the deep-sea environment,the coupled thermo-hydro-mechanical problem for saturated porous deep-sea sediments subject to the vibration of the mining vehicle is *** on the Green-Lindsay(G-L)generalized thermoelastic theory and Darcy’s law,the model of thermo-hydro-mechanical dynamic responses for saturated porous deep-sea sediments under the vibration of the mining vehicle is *** obtain the analytical solutions of non-dimensional vertical displacement,excess pore water pressure,vertical stress,temperature,and change in the volume fraction field with the normal mode analysis method,and depict them *** normal mode analysis method uses the canonical coordinate transformation to solve the equation,which can quickly decouple the equation by ignoring the modal coupling effect on the basis of the canonical *** results indicate that the vibration frequency has obvious influence on the vertical displacement,excess pore water pressure,vertical stress,and change in volume fraction *** loading amplitude has a great effect on the physical quantities in the foundation,and the changes of the physical quantities increase with the increase in loading amplitude.

关键词： deep-sea sediment thermo-hydro-mechanical dynamic generalized thermoelastic theory normal mode analysis dynamic response characteristic

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Shaking table test for reinforcement of soil slope with multiple sliding surfaces by reinforced double-row anti-slide piles

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Journal of Mountain Science 2022年第5期19卷 1419-1436页

作者： WU Hong-gang PAI Li-fang Northwest Research Institute Co. Ltd of China Railway Engineering CorporationLanzhou 730000China China Academy of Railway Sciences Beijing 100081China

Despite the continuous advancements of engineering construction in high-intensity areas,many engineering landslides are still manufactured with huge thrust force,and double-row piles are effective to control such large *** this study,large shaking table test were performed to test and obtain multi-attribute seismic data such as feature image,acceleration,and dynamic soil *** the feature image processing analysis,the deformation characteristics for the slope reinforced by double-row piles were *** analyzing the acceleration and the dynamic soil pressure time domain,the spatial dynamic response characteristics were *** Fast Fourier Transform and half-power bandwidth,the damping ratio of acceleration and dynamic soil pressure was *** that,the Seism Signal was used to calculate the spectral displacement of the accelerations to obtain the regional differences of spectral *** results showed that the overall deformation mechanism of the slope originates from tension failure in the soil *** platform at the back of the slope was caused by seismic subsidence,and the peak acceleration ratio was positively correlated with the relative pile *** dynamic soil pressure of the front row piles showed an inverted"K"-shaped distribution,but that of the back row piles showed an"S"-shaped *** predominant frequency of acceleration was 2.16 Hz,and the main frequency band was 0.7-6.87 Hz;for dynamic soil pressure,the two parameters became 1.15 Hz and 0.5-6.59 Hz,*** conclusion,dynamic soil pressure was more sensitive to dampening effects than ***,compared to acceleration,dynamic soil pressure exhibited larger loss factors and lower resonance ***,back row pile heads were highly sensitive to spectral displacement compared to front row pile *** findings may be of reference value for future seismic designs of double-row piles.

关键词： Double row anti-slide piles multislide surface landslide Shaking table test Acceleration dynamic soil pressure dynamic response characteristic

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