MODELLING TEST ON THE MECHANICAL PROPERTIES OF PRE-STRESSED LATTICE FRAMED ANCHOR STRUCTURE
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摘要: 格构锚固是边（滑）坡工程常用的防治技术之一，为了研究格构锚固结构实际支挡碎石土边坡的受力特征，利用现场大比例尺物理模型试验，填筑粘土方式模拟滑坡体，设计相似比为1：2.5的格构梁，通过后缘加载模拟了格构锚固体系承载受力直至失稳破坏的全过程，监控格构梁后部土压力、格梁应力、格梁位移等参数，并分析了格构梁受力、位移特征和变形破坏模式。结果表明：格构边界处锚固点处变形较内部更为明显，跨梁呈"拱桥式"变形，最终在锚固点附近折断破坏；各横纵梁受力特征类同，梁交叉锚固点处应力集中，梁中部受力最小，应力呈近倒三角形分布；模型中锚固点受力和位移自顶到底呈现线性递减的应力分配现象。上述研究可以为工程优化设计提供一定参考。Abstract: Lattice anchoring is one of the frequently used prevention technologies for slope and landslide engineering. A large-scale physical model test was adopted to explore the interaction of actual mechanics characteristics of lattice frame anchorage in the detritus soil slope. Using the compacted clay filling the indoor model experiment groove to simulate the landslide mass, and designing the lattice beams with the ratio of similitude 1:2.5, which revealed the whole deformation process in lattice beams of pre-stressed lattice anchorage system under the action of pre-stress, we monitored parameters of the soil pressure, stress of lattice and displacement of lattice. On the basis of analysis about stress-strain data and deformation signs, the following results are obtained:The deformation of the anchor points at the boundary of the lattice were more obvious than those of the interior, and also fractured nearby, in addition, the shape of deformed cross-beam was just like an arch bridge; The stress on each beam was near the inverted triangle distribution which was maximum at the beam crossing points; The stress distribution of the anchor points was linearly decreasing from the top to the bottom. The above research could provide some reference for engineering optimization design.
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表 1 岩土体材料参数表
Table 1. Rock and soil material parameters
模型材料 容重γ/(kN/m3) 抗剪强度 弹性模E/Mpa 泊松比v 内聚力C/kN 内摩擦角φ/(°) 碎石土 22.5 12.0 23.5 25.0 0.30 砂岩 23.0 10.0 21.5 23.5 0.40 
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表 2 H1—H4横梁在加载63 T时受力数据表
Table 2. H1 to H4 beam' s mechanical data table at the load of 63 T
横梁受力变化情况/kPa 加载63 T后 H1-1 H1-2 H1-3 H1-4 H1-5 1575 3126 3263 3710 3113 H2-1 H2-2 H2-3 H2-4 910 300 1400 750 H3-1 H3-2 H3-3 H3-4 780 510 800 580 H4-1 H4-2 H4-3 H4-4 280 110 700 410
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