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目前对桩–网复合地基的设计主要存在两点不足,一是计算路堤底桩土荷载分担时需要假设土拱高度,二是对桩间地基土反力的定量评价偏于保守。针对这两个问题,重点分析了路堤荷载作用下土拱效应与加筋薄膜效应,根据堤底桩土相对位移得到计算的土拱高度,推导土拱效应与薄膜效应共同作用下路堤荷载在桩与土之间的分配计算公式;考虑刚性桩桩顶与桩端位置的桩土相对位移以及桩周土对桩侧作用摩阻力存在中性点,根据应力、位移连续性条件,建立桩–网–土联合作用的桩承式加筋路堤的荷载效应计算模型并给出求解方法,通过3个工程实例对该方法进行合理性验证。结果表明,具备一定刚度的桩端下卧层时,采用本模型的计算结果与实测值比较接近,可为工程应用借鉴。
At present, there are two main weak points in the design of pile-net composite foundation. One is that the height of soil arches needs to be assumed when calculating the load-sharing of pile-soil at the bottom of embankment, and the other is the quantitative evaluation of the reaction force of foundation soil between piles. In view of these two problems, the soil arching effect and the reinforced film effect are analyzed emphatically. According to the relative displacements of pile-soil at the bottom of embankment, the calculated height of soil arches is deduced and the effect of soil arching and film effect is deduced. And the soil distribution formula. Considering the relative displacement of pile-soil between the top of pile and the pile-end of rigid pile and the neutral point of friction on pile side, the pile-net is established according to the stress and displacement continuity condition - Soil interaction model of pile-supported reinforced embankment load effect calculation model and gives the solution method, through three engineering examples to verify the rationality of the method. The results show that the calculated result of this model is close to the measured value when there is a certain stiffness of pile bottom layer, which can be used for engineering application.