微型抗滑桩-连梁组合结构抗滑机理试验研究

Experimental Study on Anti-sliding Mechanism of Micro Anti-slide Pile Coupling Beam Composite Structure

通过模型试验研究了多排微型抗滑桩-连梁组合结构的受力特点及破坏发展过程,对比分析了桩顶连梁和嵌固长度的影响;并通过对桩顶的连续拍照和图像处理及对桩身应变采用高精度分布式光纤监测,分析了桩的变形和受力过程。结果表明:桩顶连梁和足够的嵌固长度均能加大该组合结构的承载力;受群桩效应影响,沿滑坡方向处于边缘的桩弯矩更大,并率先达到塑性屈服,在桩变形的弹性阶段抗滑力较大,塑性阶段则低于中间桩;连梁加大了后缘桩的受拉并使前缘桩桩顶附近受压,提高了其抗滑力。

Through model test,the mechanical characteristics and damage development process of multi-row micro anti-slide pile coupling beam composite structure were studied,and the influence of pile top coupling beam and embedded length was compared and analyzed.Through continuous photography and image processing of the pile top and high-precision distributed optical fiber monitoring of the pile body strain,the deformation and stress process of the pile were analyzed.The results show that the pile top coupling beam and sufficient embedded length can increase the bearing capacity of the composite structure.Affected by the pile group effect,the bending moment of the pile at the edge along the landslide direction is larger,and it first reaches the plastic yield.The anti-sliding force is larger in the elastic stage of the pile deformation,but lower in the plastic stage than that of the middle pile.The coupling beam enlarges the tension of the rear edge pile and compresses the front edge pile near the pile top,which improves its anti-sliding force.