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王曙光, 段启伟, 李钦锐. 阶式土钉墙的工作性状研究[J]. 岩土工程学报, 2011, 33(zk1): 207-210.
引用本文: 王曙光, 段启伟, 李钦锐. 阶式土钉墙的工作性状研究[J]. 岩土工程学报, 2011, 33(zk1): 207-210.
WANG Shu-guang, DUAN Qi-wei, LI Qin-rui. Behavior of stepped soil-nail wall[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(zk1): 207-210.
Citation: WANG Shu-guang, DUAN Qi-wei, LI Qin-rui. Behavior of stepped soil-nail wall[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(zk1): 207-210.

阶式土钉墙的工作性状研究

Behavior of stepped soil-nail wall

  • 摘要: 在普通土钉墙的中部设置平台形成阶式土钉墙。与普通土钉墙相比,由于台阶的存在改变了土压力分布形态,改变了土体的应力 应变状态,其变形、土钉内力小于普通土钉墙,稳定性也优于普通土钉墙。台阶位置和台阶宽度是影响阶式土钉墙工作性状的重要因素。根据计算分析及工程经验,对于均质土边坡,台阶应设置在 0.6 倍的基坑深度左右的位置处,效果比较明显;对于基坑中部有软弱夹层的情况下,台阶应设置在软弱层顶面处。建议阶式土钉墙的台阶宽度不宜小于 0.1 倍的基坑深度。通过一个实际工程,将普通土钉墙与阶式土钉墙进行对比,工程实践表明:阶式土钉墙可以有效地减小土钉内力和土钉墙变形、提高整体稳定安全度。

     

    Abstract: Stepped soil-nail wall is formed by setting a platform in the middle part of a typical soil-nail wall. Due to the presence of the platform, the earth pressure distribution of the stepped soil-nail wall is changed, and the stress state and strain of soil are also changed. Compared with those of the typical soil-nail wall, the deformation and soil-nail internal force of the sepped soil-nail wall are smaller, and the stability is higher. Both the position and width of the platform influence the behavior of the stepped soil-nail wall. According to the numerical calculation and engineering experience, for homogenous soil slopes, the position of platform is suggested to be placed at a depth whick is 0.6 times the foundation pit. For the slope with weak interlayer, the flatform is suggested to be set on the top surface of the weak interlayer. The step width is suggested to be not less than 0.1 times the depth of foundation pit. Through a practical engineering example, the general behaviour of both the typical soil-nail wall and the stepped soil-nail are compared. It is demonstrated that both the horizontal displacement and the nail force of the stepped soil-nail wall are smaller than those of the typical soil-nail wall, and the stability of the former is higher.

     

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