基于局部强度折减法的桥梁墩台滑坡加固设计-《高速铁路技术》

文章信息/Info

Title:: Reinforcement Design of Landslide at Bridge Pier or Abutment Foundation Based on Local Strength Reduction Method

Author(s):: XIAO Chaoqian; FU Zhengdao; WANG Zhimeng; China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China

Keywords:: local strength reduction method|bridge|pier and abutment|landslide|structure deformation

摘要:: 当桥梁墩台基础设置在滑坡上时，存在滑坡虽未达到剪切破坏极限状态，但墩台基础已产生过大变形的可能。因此，对于此类存在变形敏感结构物的滑坡，设计时除分析滑坡的整体稳定性外，更应注重墩台基础受力与变形的计算，以确保墩台基础水平位移控制在容许范围内。为此，本文提出采用针对滑动面的局部强度折减法来计算滑坡和墩台的变形，并与整体强度折减法进行对比分析。研究结果表明：整体强度折减法显著放大了滑坡水平位移和滑坡推力，局部强度折减法能够很好地解决整体强度折减法求解滑体剪切变形失真的问题，能真实地反映滑体的剪切变形分布规律。同时，本文还给出了桥梁墩台滑坡加固设计的关键步骤，可为以结构物变形控制为主的滑坡加固设计提供参考。

Abstract:: When the bridge pier or abutment foundation is set on the landslide, there exits a case although the landslide has not reached the shear failure limit state, but it is possible that the excessive deformation has occurred at the foundation of pier or abutment. For landslides with deformation-sensitive structures, in addition to analyzing the overall stability of the landslide, more attention shall be paid to the calculation of stress and deformation of the pier or abutment foundation to ensure that the horizontal displacement of the pier or abutment foundation is controlled within the allowable range. Therefore, the local strength reduction method for the sliding surface is proposed to calculate the deformation of landslide and pier or abutment, and compared with the overall strength reduction method. The results show that the overall strength reduction method can significantly amplify the horizontal displacement and thrust of the landslide, and the local strength reduction method can well solve the problem of shear deformation distortion of the sliding mass by the overall strength reduction method, and can truly reflect the distribution law of shear deformation of the sliding mass. At the same time, this paper also gives the key steps of the reinforcement design of the landslide at the pier and abutment foundation, which can provide the reference for the reinforcement design of the landslide with deformation-sensitive structure.