泥石流荷载下钢管混凝土桩林结构的抗冲击性能

Impact Resistance of Concrete Filled Steel Tubular Piles Under Debris Flow Load

[目的]分析新型拦挡坝钢管混凝土桩林结构在泥石流冲击荷载作用下的动力响应,为其结构的设计提供有效的科学依据。[方法]通过ANSYS有限元分析软件对3种不同泥石流荷载工况下桩林坝进行数值模拟,主要分析结构的应力、应变和位移等响应。对比3种工况的响应,得到结构的最不利荷载工况。[结果]空库桩管顶部受大石块冲击是结构的最不利荷载工况,3种工况相对比,发现大石块的冲击力是导致结构破坏的主要因素;钢管混凝土桩林具有良好的抗冲击性能,在较小的塑性变形下,结构承受较大的冲击力,且受撞击构件刚度越大,冲击力峰值越大;桩管和梁管的连接部位、桩管根部和端部受约束梁管是坝体的薄弱部位,因此设计时应采取加强措施。[结论]钢管混凝土桩林是一种节约材料稳定性较好的拦挡结构,具有良好的抗冲击性能。

[Objective]To analyze the dynamic response of concrete filled steel tubular pile structure under the impact of the load of debris flow in order to provide scientific support for the design of the structure.[Methods]The numerical simulation of concrete filled steel tubular pile structure was carried out for three different load conditions using finite element analysis software ANSYS,and the stress,strain and displacement response of structure was analyzed to detect the most unfavorable load conditions.[Results]The impact of large rock at the top of the pile pipe of empty reservoir was the most unfavorable load condition.Among three kinds of load conditions,the impact force was the main factor causing structural damage.The concrete filled steel tubular pile had good anti-impact performance.Under the smaller plastic deformation,the structure bear a large impact force.The larger the component stiffness,the greater the peak impact force peak.The connecting part of the pile pipe and the beam pipe,the root of the pile pipes and restrained beam pipes were the weak parts of the dam,so the strengthening measures should be taken into the design.[Conclusion]Concrete filled steel tubular piles is a material saving blocking structure,and it has good stability and anti-impact performance.