【作者】 李航飞；

【导师】 刘伯权；

【作者基本信息】 长安大学 ， 结构工程， 2010， 硕士

【摘要】 延安处于黄土高原梁峁地区,川道狭长的缺点,给不断扩大的城市建设带来了诸多不利。由于建设用地紧张,目前延安市开始向川道两边坡地上扩大发展,由此引起的建筑边坡安全成了重点关注问题。而双排桩支护结构作为一种工程措施,在边坡加固、滑坡治理等方面具有广泛应用。目前,关于双排桩支护结构的研究及应用,多集中于沿海与南方地区,而在西北黄土地区的相关研究及应用则相对较少。为此,本文针对黄土地区双排桩支护结构的工作性能及桩土接触作用进行了研究,为该地区类似工程计算提供参考。首先,整理了目前国内关于双排桩的几种常见计算方法,分析了各方法的特点,并提出本文工程算例的计算方法。该法选用改进的修正系数法,结合桩间土压力修正系数,按照朗肯主、被动土压力的分布形式进行计算。该方法概念明确,简单易行且计算精度易于保证。再者,采用Marc有限元程序建立双排桩支护结构模型,对影响双排桩支护结构性能的重要参数如桩间距、桩截面尺寸、连梁高度等进行了分析；另外,对桩土接触作用如临界接触深度、桩侧土压力与摩阻力的分布情况进行了分析,得出了合理桩排距、合理桩截面尺寸等相关结论。最后,结合延安马家湾小区1#东段双排桩支护结构的相关数据,建立有限元模型进行模拟分析,将有限元分析结果与手算计算结果进行对比分析,证明本文提出的针对黄土地区双排桩的计算方法是可行的,为类似工程设计及施工提供有益的参考。更多还原

【Abstract】 The city of Yan’an, is located in the hilly loess plateau region, while the long and narrow watercourse makes lots of trouble in the process of city construction. Because the construction land is becoming increasingly scare, the city construction is intended to the slope on the both side of watercourse, so the security of slope engineering is getting more and more concern.Double-row piles supporting structure, as a kind of engineering measure, has been used wildly in slope reinforcement engineering and treatment of landslide geological disasters. However, the current research and application of double-row piles supporting structure is mostly concentrated in the coastal and southern regions, while less in the northwest loess region. For these reasons, the thesis is mainly discussed about the double-row piles supporting structure’s work mechanism and pile-soil contact interactions in loess region, for the similar projects calculation to provide some reference.Firstly, it is sorted out the current domestic double-row piles on the calculation of several common methods, analyzed each method’s characteristic and proposed the hand-count method calculating example in this thesis. The hand-count method is chosen the advanced correction factor method, combining with the pile-soil interactions factor and the Rankine active and passive earth pressure’s distribution of the form, which of the concept is clear, simple and easy to guarantee accuracy.Secondly, the calculating model of double-row piles is given by the finite element program Marc. Some double-row piles correlative parameters, like the spacing of rows-pile、cross-section size、the height of joining beam and so on, are analyzed; In addition, on the role of pile-soil interaction, such as the critical contact depth, pile-side earth pressure and the distribution of frictional resistance are analyzed and obtained some reasonable spacing of rows, pile cross-section size and other related and reasonable conclusions.Finally, combined the relevant data of Yanan Ma Jiawan District 1 # eastern section of double-row piles supporting structure, the finite element calculating model is given and analyzed. Then, finite element analysis results with hand-count results are compared to prove the hand-count method proposed in this thesis for the loess region calculation of double-row piles is feasible, for similar projects to provide some reference.更多还原