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Study on the mechanical performance of zigzag anti-slide pile on steep inclined slip surface landslide

DOI：

 作者 单位 邮编 侯小强 兰州交通大学 730000 刘杰瑞* 兰州交通大学 730070 王新飞 兰州交通大学 周重任 兰州交通大学 万宝峰 甘肃工程地质研究院

陡倾滑面滑坡推力竖向分力显著，基于滑坡推力水平假定与普通抗滑桩相互作用不充分这一问题，建立锯齿形抗滑桩结构。依据梯形分布滑坡推力的假设，推导了受荷段内力计算公式，采用Winkler弹性地基理论推导了锚固段内力计算公式，并开展锯齿形抗滑桩的力学性能研究。分析表明，(1)随着滑面倾角的增加,锯齿形抗滑桩的受荷段、锚固段的弯矩、剪力以及侧应力均减小，且内力减小幅度也随之增大；(2)滑面倾角在20°～40°时，随着滑面倾角的增加，锚固段的理论最小长度在逐渐增加，40°时锚固段的长度为4.2m达到最大值，且该长度仅占整个桩长35%，远小于按现行规范取得的锚固段长度最大值(1/2总桩长)，桩侧摩阻力就可以完全满足竖向力学平衡；(3)锯齿形抗滑桩结构优化，靠近桩顶竖向分力较小对桩剪力和弯矩影响也较小，可以取消桩顶附近分力块；若滑面附近抗滑桩弯矩较大，通过增加该处分力块大小可有效减小桩弯矩和剪力；（4）提高锯齿形抗滑桩与普通抗滑桩内力对比,受荷段和锚固段的弯矩减小34%、剪力36%及桩侧应力大于30%，力学性能良好。

Vertical component of thrust of landslide on steep inclined sliding surface is significant. Based on insufficient interaction between thrust level of landslide and common anti-slide pile, zigzag anti-slide pile structure is established. Based on the assumption of trapezoidal distribution of landslide thrust, the internal force calculation formula of loaded section is derived, the internal force calculation formula of anchoring section is derived by Winkler elastic foundation theory, and the mechanical properties of zigzag anti-slide pile are studied. The analysis shows that, (1) with the increase of inclination of sliding surface, the load section, bending moment, shear force and side stress of zigzag anti-slide pile decrease, and the internal force decreases accordingly. (2) When the inclination angle of sliding surface is between 20 and 40 degrees, with the increase of the inclination angle of sliding surface, the theoretical minimum length of the anchor section gradually increases. At 40 degrees, the length of the anchor section reaches the maximum value of 4.2m, which only accounts for 35% of the total length of the pile and is much smaller than the maximum length of the anchor section (1/2 of the total pile length) obtained according to current specifications, and the friction resistance of the pile side can fully meet the vertical mechanical balance. (3) The jagged anti-slide pile structure is optimized, and the smaller vertical component near the top of the pile has less influence on the shear force and bending moment of the pile, so the component blocks near the top of the pile can be cancelled. If the bending moment of anti-sliding pile near the sliding surface is large, the pile bending moment and shear force can be effectively reduced by increasing the size of the force block at this location. (4) By improving the internal force comparison between zigzag anti-slide pile and common anti-slide pile, the bending moment of loaded section and anchoring section is reduced by 34%, the shear force is 36% and the stress on side of pile is more than 30%, and the mechanical properties are good.
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