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Refined model analysis of basement rock degradation mechanism of heavy-haul railway tunnel

Underground Space 2021年第3期6卷 342-352页

作者： Zheng Li Ziqiang Li Ruyi Cai Yang Hua Lin Wang Dongming Gu Chongqing City Construction Investment(Group)Co. Ltd.Chongqing 400023China School of Civil Engineering and Architecture Chongqing University of Science&TechnologyChongqing 401331China China Railway Eryuan Engineering Group CO.LTD Chengdu 610031China School of Civil Engineering Chongqing UniversityChongqing 400045China

This study investigated the degradation mechanism of the surrounding rock of a heavy-haul railway under a water-rich condition,based on the construction of the Taihangshan tunnel for the Wari Railway,a heavy-haul railway that used standard construction practices for axle loads of 30 *** monitoring demonstrated that the coupling effect between the dynamic load of a heavy-haul train and the groundwater leads to the deterioration and hollowing of the surrounding *** study clarified the void evolution process and deterioration mechanism of the basement rock under the comprehensive influence of the groundwater–train dynamic load using a refined discrete element numerical *** results revealed that the groundwater was the primary influencing factor in the deterioration of the lower part of the heavy-haul railway *** particles were gradually lost under the effects of long-term erosion due to groundwater and heavy-haul trains,which inevitably damaged the basement rock after the construction was *** on this observation,the critical conditions for the deterioration and attenuation law of the physical parameters of the basement rock were *** results of this study can provide ideas and serve as a reference for the forecasting and disaster treatment of basement rock damage in heavy-haul railway tunnels.

关键词： Heavy-haul railway tunnel Refined model analysis Degradation mechanism Surrounding rock water-rich condition

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