Moso Bamboo Soil-Nailed Wall and Its 3D Nonlinear Numerical Analysis
Moso Bamboo Soil-Nailed Wall and Its 3D Nonlinear Numerical Analysis
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DOI：
10.1061/(asce)gm.1943-5622.0000634
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发表时间：
2016-10-01
影响因子：
3.7
通讯作者：
Chen, Yan-Jia
中科院分区：
文献类型：
--
作者：
Dai, Zi-Hang;Guo, Wei-Dong;Chen, Yan-Jia
本文提出了一种新型的挡土结构——毛竹土钉墙。毛竹（包括树枝）用作土钉和桩，并用于编织竹条网格（代替钢筋网格）用于喷射混凝土面层。本文通过实验室和现场试验以及两个已完成项目的稳定性和变形数值模拟，详细阐述了该结构的设计和施工方法。现场试验表明，与钢管钉相比，在硬土或软粘土中，竹钉（带树枝）的拉力分别提高约2.5-2.8倍。对一堵软粘土墙进行了数值分析，验证了竹筋体系的稳定性（与失败的钢管钉土钉墙相比）。对于另一堵墙，使用三维（3D）非线性数值软件获得了结构的变形和内力。预测结果与实测沉降吻合较好，并且相对于实测水平位移具有良好的精度。研究表明，最低层的那排钉子承受的轴向力最高（需要最长的长度）。这种趋势与使用传统土钉墙的趋势相反。毛竹法增加了滑动深度，从而提高了开挖的稳定性，而传统钢管土钉建造的墙体则无法做到这一点。
This paper presents a new earth-retaining structure, the moso bamboo soil-nailed wall. Moso bamboo (including branches) is employed as soil nails and piles, and used to weave bamboo strip grids (replacing rebar grids) for sprayed-concrete surface courses. In this paper, the design and construction methods of this structure are elaborated using laboratory and field tests, and numerical simulations for two completed projects with respect to stability and deformation, respectively. In-situ tests show that the pulling capacity of bamboo nails (with branches) increased by approximate to 2.5-2.8 times in stiff soil or soft clay, respectively, compared with steel-pipe nails. For one wall in soft clay, numerical analysis was conducted, which verified the stability of the bamboo-reinforced system (compared with the soil-nailed wall constructed with steel-pipe nails, which failed). For another wall, the deformation and internal force of the structure were obtained using three-dimensional (3D) nonlinear numerical software. The prediction agrees well with the measured settlements, and has good accuracy against the measured horizontal displacements. The study indicates that the row of nails the lowest level receives the highest axial force (which requires the longest length). This trend is opposite to that in using conventional soil-nailed walls. The moso bamboo method renders an increase in the depth of sliding and thus the stability of excavation, which failed in the wall constructed with conventional steel-pipe soil nails.