【作者】 邓夷明；

【导师】 毛坚强；

【作者基本信息】 西南交通大学 ， 岩土工程， 2008， 硕士

【摘要】 作为一种有效的工程措施,抗滑桩在边坡加固工程、滑坡地质灾害防治中得到了广泛应用。然而,由于问题的复杂性,关于抗滑桩的工作机理、桩-土相互作用规律等问题并没有很好地解决,其设计理论与计算方法,还处于半经验半理论的不成熟阶段,特别是对于双排抗滑桩的研究,落后于工程实践。本论文的主要目的是研究双排抗滑桩的作用机理,计算采用Abaqus有限元软件,滑体假定为理想弹塑性材料,并服从Mohr-Coulomb屈服准则,滑带简化为接触面,作为接触问题采用罚函数方法求解。根据计算结果,分析了前、后桩在不同排距、不同抗弯刚度时,桩的弯矩、剪力等内力的变化规律、滑坡推力在两桩上的分配比率。并应用上述研究成果,对一实际工程的抗滑桩进行了设计计算。通过研究得到以下主要结论:1.有限元法可较为合理地解决前排、后排桩受力分配的问题,这是传统计算方法达到的。2.排距的变化影响弯矩、剪力和推力的大小。但不影响内力沿桩的分布形态。3.前、后桩相同刚度时,通常后排桩所承受的推力、内力较前排桩大,且随排距的增大而减小,而前排桩的推力随排距的增大而增大。4.前、后排桩刚度分别变化时,刚度变化的桩自身弯矩、推力增大且变化明显,而另外一排桩弯矩、推力减小。更多还原

【Abstract】 As a kind of enginnering measure, anti-slide pile has obtained widely application in slope reinforcement engineering and treatment of landslide geological disasters. However, there are many problems corcerning the mechanics of anti-slide pile such as the interaction effect between pile and soil to be sloved . The design of anti-slide piles has to depend on the experience of the engineerers, especially in the design of double row piles.The main aim of this paper is to study the mechanism of double row piles. The software of Abaqus was used for the finite element calculation. Elasto-plastic model following Mohr-Coulomb law was employed for the sliding body, and the slip band was taken as contact interface. Taken as contact problem, the problem was sloved with penalty function method. The influences of spacing between fore row and after row piles, the size of piles on the thrust force and internal forces of piles were analyzed. Finally, the resluts of the research were demonstrated to design an double row anti-slide piles. Following conclusions are obtained :1. The thrust force and internal forces of piles can by solved with FEM more exactly than the conventional calculating method in present design.2. The spacing between fore and after piles has more influences on the magnitude of internal forces and thrust force of the piles, less influences on the distributing form of them.3. Generally, under the condition of same sizes for the fore and after piles, the internal forces and thrust force of the after pile are larger than those of the fore pile and the forces of after pile will decrease as the spacing increase.4. The variation of the sizes of pile will change the forces of pile itself more prominently than those of pile at the other row.更多还原