改进的桩锚计算模型及其计算方法研究

因岩土体-桩-锚索相互作用的复杂性,目前关于锚拉桩挡墙的计算模型中存在诸多问题。比如,在目前预应力锚索抗滑桩的设计中,没有考虑锚索张拉阶段产生的主动加固力作用以及桩锚协调方程未能考虑张拉阶段桩锚固点向坡内产生的位移等。计算模型的不合理导致长期以来锚索拉力计算不合理。为解决这类问题,根据施工和工作的两种工况提出改进的两阶段计算模型。在此基础上,利用初参数法给出基于双参数地基反力模型的全桩解算方法,并通过实例,对改进的计算方法和现有计算方法进行了分析比较,结果表明:前者比较符合工程实际,有利于保证结构安全。

Research on Improved Piled Anchor Calculation Model and Its Calculation Method

Due to the complexity of rock-soil mass-pile-anchor cable interaction,there are many problems about the calculation model of anchored pile retaining wall at present.For example,the design of anchored anti-sliding piles fails to consider the active reinforcement effect generated in the anchor cable pretention stage;and the pile-anchor coordination deformation equation fails to consider the displacement of pile anchor point towards the slope at pretention phase.The unreasonable calculation model leads to unreasonable calculation of anchor stress for a long term.To solve this problem,the improved two-stage calculation model is put forward as per the construction and work conditions.On the basis of two-stage calculation model,the whole pile calculating method is given based on the double parameter foundation reaction model and the initial parameter method.Finally,through practical example,the improved calculation method and the original calculation method are compared and analyzed.Results show that the former.conforms to the engineering practice and can ensure the safety of structure.