抗滑挡墙受力机理及结构设计研究

    RESEARCH ON THE FORCE MECHANISM AND STRUCTURAL DESIGN OF ANTI-SLIDE RETAINING WALL

    • 摘要: 为探究抗滑挡墙与小型滑坡体的相互作用形式,并对传统抗滑挡墙加以改良。选取某小型滑坡为研究对象,开展了室内模型试验与数值分析,分析了抗滑挡墙墙后滑坡推力分布特点,以此概化出小型滑坡抗滑挡墙墙后滑坡推力分布规律,并选取两个实例滑坡验证了此规律的普适性。基于此,设计了一种新型的滑坡生态防治支护组合结构。结论如下:物理模型试验实测滑坡推力分布规律与数值分析的结果基本吻合;抗滑挡墙墙后受力分布整体近似为“鱼钩型”,从滑面到坡面,滑坡推力整体呈先增大后减小的趋势,在靠近坡面一定范围维持在较小值,且减小不明显;抗滑挡墙的埋深对墙后滑坡推力峰值的作用位置有所影响,对推力分布规律影响不大;新型挡墙结构考虑了滑坡推力上小下大的作用规律,采用了上部反包式挡墙与下部重力式挡墙相结合的形式,相比于重力式挡墙,节约了材料,降低了工程成本,在支护滑坡的同时有利于生态环境的恢复。该研究成果可为类似小型滑坡抗滑挡墙防治设计理论研究及工程实践提供参考,具有一定的理论意义与工程实践价值。

       

      Abstract: In order to explore the interaction between the anti-slide retaining wall and the small landslide body,and to improve the traditional anti-slide retaining wall. Taking a small landslide as the research object,indoor model tests and numerical analyses were carried out,and the distribution characteristics of landslide thrust behind the anti-slide retaining wall were analyzed. Based on this,the distribution law of landslide thrust behind the anti-slide retaining wall of small landslides was generalized,and two examples of landslides were selected to verify the universality of this law. Accordingly,the paper designed a novel support structure that combines the functions of ecological control and landslide treatment. The conclusions show that the test data from physical tests is consistent with the results of numerical simulations,ultimately proving that the numerical simulation is accurate and the test method is applicable to this research. The stress distribution behind the anti-slide retaining wall is approximately 'fishhook'; from the slide surface to the slope surface,the overall trend of the landslide thrust first increases and then decreases. In a certain range near the slope,the landslide thrust is maintained at a small value,and the decrease is not obvious. Compared with the traditional gravity retaining wall,the new-type anti-slide retaining wall saves materials,reduces engineering costs,and helps to restore the ecological environment while supporting the landslide. The research results can provide a certain test basis and design reference for the basic research and optimization design of anti-slip retaining walls in small landslide management,and it has good applicability and application value.

       

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