桩网结构支承路堤土拱效应改进算法

Improved Algorithm for the Soil Arching Effect of Pile-Net Supported Embankment

从工程实际出发,对Hewlett土拱效应所考虑的影响因素加以补充,并根据摩尔-库仑强度准则考虑了路堤填土的黏聚力对土拱效应的影响,以及分析水平加筋体与碎石垫层之间的相互作用,建立加筋体与碎石垫层之间相互作用的力学模型,导出水平加筋体的变形受力计算公式;通过分析水平加筋垫层对土拱效应的影响,改进Hewlett算法,推导出桩网结构支承路堤的桩体荷载分担比和桩土应力比公式,并通过具体工程实测数据的对比分析,验证了改进算法的合理性和可靠性。

Based on engineering practice, the influencing factors considered by Hewlett arching effect were supplemented. The cohesive force impact of the embankment filling on soil arching was considered by the Mohr-Coulomb strength failure criterion. The interaction between the horizontal reinforced body and the gravel cushion was analyzed. The mechanical model to reflect the interaction between the reinforced body and the gravel cushion was built. The deformation and stress calculation formula of the horizontal reinforced body was established. Hewlett algorithm was improved by analyzing the impact of the horizontal reinforced cushion on the soil arching. Formulas were deduced for calculating the load sharing ratio of the pile body and the pile-soil stress ratio of pile-net supported embankment. The results obtained from the improved method and the data from a practical case were compared and analyzed in details, and the rationality and reliability of the improved method was verified.