Behavior of stepped soil-nail wall
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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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Keywords:
- stepped soil-nail wall /
- earth pressure /
- platform position /
- platform width /
- field test
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[1] 王曙光 , 叶 焱 , 段启伟 , 等 . 阶式土钉墙支护结构变形机理及设计方法研究 [R]. 北京 : 中国建筑科学研究院地基所 , 2008, 12. (WANG Shu-guang, YE Yan, DUAN Qi-wei, et al. Research on displacement and design method of stepped soil-nail wall[R]. Beijing: Institute of Foundation Engineering, China Academy of Building Research, 2008, 12. (in Chinese)) [2] 陈肇元 , 崔京浩 . 土钉支护在基坑工程中的应用 [M]. 第 2 版 . 中国建筑工业出版社 , 2000. (CHEN Zhao-yuan, CUI Jing-hao. The application of soil nailing supporting in the foundation pit[M]. 2nd ed. Beijing: China Architecture & Building Press, 2000. (in Chinese)) [3] 杨广庆 . 台阶式加筋土挡土墙设计方法的研究 [J]. 岩石力学与工程学报 , 2004, 23 (4): 695 – 698. (YANG Guang-qing, Study on design method of tiered reinforced earth retaining wall[J]. Chinese Journal of Rock Mechanics and Engineering. 2004, 23 (4): 695 – 698. (in Chinese)) [4] 赵星民 , 李 明 . 台阶式加筋土挡墙土压力计算研究 [J]. 西部探矿工程 , 2008(4): 34 – 36. ( ZHAO Xing-min, LI Ming. Study on calculation methods of tiered reinforced earth retaining wall[J]. West-China Exploration Engineering, 2008(4): 34 – 36. (in Chinese)) [5] 王曙光 , 段启伟 , 王艳永 . 某土钉墙工程现场实测研究 [J]. 建筑科学 , 2010, 26 (1): 93 – 96. (WANG Shu-guang, DUAN Qi-wei, WANG Yan-yong, Research on the soil-nail wall by field tests[J]. Building Science, 2010, 26 (1): 93 – 96. (in Chinese))
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