With the accelerating process of urbanization, the construction of expressway underpass tunnel faces more challenges, which is easy to induce the pavement settlement, especially the uneven settlement, which affects th...With the accelerating process of urbanization, the construction of expressway underpass tunnel faces more challenges, which is easy to induce the pavement settlement, especially the uneven settlement, which affects the normal operation of the highway to a certain extent. In order to actively explore the impact of tunnel underpass construction on the existing expressway and select a better construction method for its construction, this paper, based on the actual case level, carries out data simulation research on it through ANSYS and FLAC 3D, and finally obtains good research results.展开更多
The objective of this research is to analyze the deformation characteristics in space and the dynamic reaction of tunnel underpass hauling sliding surfaces when subjected to potential seismic activities.The response c...The objective of this research is to analyze the deformation characteristics in space and the dynamic reaction of tunnel underpass hauling sliding surfaces when subjected to potential seismic activities.The response characteristics and failure mode of tunnel linings are uncovered through an analysis of their time-frequency dynamic behavior.It is thoroughly discussed that there are correlation characteristics of plectrum amplitude in multivariate data under different excitation intensities and the spectrum difference characteristics during different shaking stages.The findings indicate that the slope's structural characteristics and failure modes correspond to the shallow slip type and the deformation trend of the deep weak basement slip type.The influence of topographic bias can be disregarded in tunnel underpass hauling sliding surfaces.The axial force(f_(a))in the tunnel lining section primarily exhibits pressure,while the bending moment(M_(b))is symmetrically distributed along the lining section.Tunnels are susceptible to collapse and invert uplift damage.The dominant frequency bands of dynamic strain,dynamic soil pressure,and acceleration are mainly concentrated within the 1–15 Hz range.Dynamic soil pressure and acceleration have a significant correlation,whereas the dynamic strain exhibits a weak correlation with both.The dynamic strain and acceleration exhibit sensitivity in their spectrum response before and during the main shock,whereas the dynamic soil pressure shows sensitivity in its spectrum response after the main shock.Based on the spectral response differences of multi-attribute data during various shaking stages,which can present a novel approach for dynamic monitoring and early warning of seismic actions.展开更多
超标降雨情景下,城市中大量下穿道常为内涝高风险区域,解析这类地形的洪涝风险变化特征并推演降雨致灾风险阈值,对城市防洪减灾具有重要的现实意义。以某山地城市复杂三层下穿道立交为研究对象,基于暴雨洪水管理模型(Storm Water Manage...超标降雨情景下,城市中大量下穿道常为内涝高风险区域,解析这类地形的洪涝风险变化特征并推演降雨致灾风险阈值,对城市防洪减灾具有重要的现实意义。以某山地城市复杂三层下穿道立交为研究对象,基于暴雨洪水管理模型(Storm Water Management Model, SWMM),构建了超标降雨情景下城市下穿道立交的精细化水力模型,模拟分析了城市下穿立交内涝风险变化特征,并从降雨强度和降雨总量两个角度解析了致涝降雨的阈值。研究结果表明,降雨强度对最大积水深度有明显正向影响。积水时长通常随降雨历时增加而增大。短历时降雨表现为雨强致涝,长历时降雨表现为雨量致涝。且短历时强降雨需被重点关注。研究为城市应对超标降雨内涝风险提供了模型构建及降雨阈值确定方法。展开更多
文摘With the accelerating process of urbanization, the construction of expressway underpass tunnel faces more challenges, which is easy to induce the pavement settlement, especially the uneven settlement, which affects the normal operation of the highway to a certain extent. In order to actively explore the impact of tunnel underpass construction on the existing expressway and select a better construction method for its construction, this paper, based on the actual case level, carries out data simulation research on it through ANSYS and FLAC 3D, and finally obtains good research results.
基金financial support received from the key R&D program of Gansu Province(No.23YFGA0028)The Key Research and Development Project of Lanzhou Jiaotong University(LZJTU-ZDYF2305)+4 种基金the Science and Technology Research and Development Plan of China Railway Co.,Ltd.(2022-Major Project-07)Tianyou Postdoctoral Science Foundation Project(TYBSH_KJ_202307)Lanzhou Jiaotong University-Southwest Jiaotong University Joint Innovation Fund project(LH2023012)Gansu Provincial Department of Education university teachers innovation fund project(2024A-044)Scientific Research Project of China Railway 21 First Group Co.,Ltd.(24A-2,23C-10).
文摘The objective of this research is to analyze the deformation characteristics in space and the dynamic reaction of tunnel underpass hauling sliding surfaces when subjected to potential seismic activities.The response characteristics and failure mode of tunnel linings are uncovered through an analysis of their time-frequency dynamic behavior.It is thoroughly discussed that there are correlation characteristics of plectrum amplitude in multivariate data under different excitation intensities and the spectrum difference characteristics during different shaking stages.The findings indicate that the slope's structural characteristics and failure modes correspond to the shallow slip type and the deformation trend of the deep weak basement slip type.The influence of topographic bias can be disregarded in tunnel underpass hauling sliding surfaces.The axial force(f_(a))in the tunnel lining section primarily exhibits pressure,while the bending moment(M_(b))is symmetrically distributed along the lining section.Tunnels are susceptible to collapse and invert uplift damage.The dominant frequency bands of dynamic strain,dynamic soil pressure,and acceleration are mainly concentrated within the 1–15 Hz range.Dynamic soil pressure and acceleration have a significant correlation,whereas the dynamic strain exhibits a weak correlation with both.The dynamic strain and acceleration exhibit sensitivity in their spectrum response before and during the main shock,whereas the dynamic soil pressure shows sensitivity in its spectrum response after the main shock.Based on the spectral response differences of multi-attribute data during various shaking stages,which can present a novel approach for dynamic monitoring and early warning of seismic actions.
文摘超标降雨情景下,城市中大量下穿道常为内涝高风险区域,解析这类地形的洪涝风险变化特征并推演降雨致灾风险阈值,对城市防洪减灾具有重要的现实意义。以某山地城市复杂三层下穿道立交为研究对象,基于暴雨洪水管理模型(Storm Water Management Model, SWMM),构建了超标降雨情景下城市下穿道立交的精细化水力模型,模拟分析了城市下穿立交内涝风险变化特征,并从降雨强度和降雨总量两个角度解析了致涝降雨的阈值。研究结果表明,降雨强度对最大积水深度有明显正向影响。积水时长通常随降雨历时增加而增大。短历时降雨表现为雨强致涝,长历时降雨表现为雨量致涝。且短历时强降雨需被重点关注。研究为城市应对超标降雨内涝风险提供了模型构建及降雨阈值确定方法。
