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为研究新型围桩-土耦合抗滑结构的工作机理,通过室内模型试验,采用土压力盒等应力测试手段,得到了耦合结构内外及各围桩桩后的土压力变化规律。结果分析表明:粘性土滑坡体中,采用围桩间距为4倍桩径,呈正六边形布置的耦合结构,锚固深度为桩长的2/5,在滑坡推力作用下,抗滑段内各围桩后土压力近似呈抛物线分布,在滑面以上约桩长10%附近出现最大值。各围桩与桩中土压力值大致相等,围桩与桩间土体能够形成桩土耦合体共同抵抗外荷载。锚固段内土压力值普遍较小,大致呈三角形分布。
In order to study the working mechanism of the new type of pile-soil coupling anti-slide structure, the change rule of earth pressure behind and inside and outside the coupling structure was obtained by indoor model test and earth pressure test. The results show that: In the clay landslide body, the coupling structure with regular hexagonal pile diameter of 4 times of pile diameter is adopted, and the anchorage depth is 2/5 of the pile length. Under the action of landslide thrust, The earth pressure near the piles is approximately a parabolic distribution, with a maximum around 10% of the pile length above the slip surface. The value of soil pressure around the piles and piles is roughly equal, and the piles and soil between the piles and piles can form pile-soil coupling body to resist external loads. The value of earth pressure in the anchorage section is generally small, roughly triangular distribution.