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根据大型滑坡处治所采用的h型抗滑桩的承载变形特性,将其分为阻滑段与锚固段两部分,考虑桩周岩土体对前后排桩的作用特性,提出滑坡推力作用下阻滑段与锚固段的承载变形分析模型,并基于结构力学与桩基分析理论建立相应的内力与变形简化计算方法,进而建立出h型抗滑桩简化计算方法。结合典型工程实例,对比分析不同受力工况以及基桩截面尺寸、桩间距与锚固深度等因素对h型抗滑桩桩身内力与变形的影响规律,结果表明:考虑桩间岩土体对前后排桩的作用力与采用比例系数分配滑坡推力2种方法进行设计计算将更符合工程实际情况,且计算结果相近;悬臂长度与滑坡推力对基桩内力与变形的影响程度均最大,截面尺寸对基桩变形的影响程度大于内力;优化设计时应合理确定悬臂长度与分担的滑坡推力,锚固深度宜取1/3~1/2桩长,横梁刚度宜取1.0~2.0倍前后排桩的刚度,根据岩土体性质应使桩间距能够满足产生坡体压力与抗力或传递滑坡推力,可取2.0~4.0倍桩径。
According to the bearing deformation characteristics of the h-type anti-slide pile used in the large-scale landslide treatment, it is divided into two parts: the anti-slip section and the anchorage section. Considering the action characteristics of the soil around the pile on the front and back piles, The analysis model of bearing deformation of the sliding block and the anchorage section is established. Based on the structural mechanics and pile foundation analysis theory, a corresponding simplified calculation method of the internal force and deformation is established, and a simplified calculation method of the h-type anti-slide pile is established. Combined with the typical engineering examples, the influence of different stress conditions on the internal forces and deformations of h-type anti-slide piles under different stress conditions, such as the section size, pile spacing and anchorage depth of the pile, is compared and analyzed. The results show that: The design and calculation of two kinds of methods, ie, the action of front row and rear row of piles and the distribution of landslide thrust with proportion coefficient, will be more in line with the actual situation of the project and the calculation results are similar. The influence of boom length and landslide thrust on the internal forces and deformation of the pile is the largest, The influence on the deformation of the pile is greater than the internal force; the length of the cantilever and the share of the thrust of the landslide should be reasonably determined in the optimal design. The anchorage depth should be 1/3 ~ 1/2 pile length and the beam rigidity should be 1.0 ~ 2.0 times Stiffness, according to the nature of rock and soil should make the spacing between the piles to meet the pressure and resistance generated by the slope or to transmit landslide thrust, desirable 2.0 ~ 4.0 times the diameter of the pile.