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为真实反映加筋桩承式路堤的土拱效应,采用三维球形土拱假设,建立了一种路堤荷载和均布荷载共同作用下的土拱效应分析方法。基于Hewlett土拱分析方法推导了无加筋体时路堤荷载和均布荷载作用下的桩土荷载分担表达式;对于加筋桩承式路堤,依据桩帽顶部加筋体沉降的特征,将加筋桩承式路堤分为2个部分,采用不同的沉降假设分别建立其竖向平衡方程,求得桩帽顶面和桩间土表面对加筋体的支撑力;通过离心模型试验和现场实测结果进行对比验证,采用参数分析法对影响土拱效应的主要因素进行等级评价。结果表明:加筋体抗拉强度对桩土应力比以及加筋体拉力均具有很高的影响等级,研究结果能够为分区域铺设加筋体提供理论依据。
In order to truly reflect the soil arching effect of the reinforced piled embankment, a three-dimensional spherical soil arch assumption was used to establish a soil arching effect analysis method under the joint action of embankment load and uniform load. Based on Hewlett’s method of soil arch analysis, the load-sharing formula of pile-soil under embankment load and uniform load with no reinforcement body is deduced. For the reinforced pile-supported embankment, according to the characteristics of the settlement of stiffened body at the top of pile cap, The pile-supported embankment is divided into two parts. The vertical equilibrium equations are established by using different settlement assumptions, and the supporting force of the pile body on the top surface of the pile cap and the soil surface between the piles is obtained. Through the centrifugal model test and field measurement The results are compared and verified. The main factors influencing soil arching effect are evaluated by the method of parameter analysis. The results show that the tensile strength of the reinforced body has a very high influence on the stress ratio of the pile and the soil and the tensile force of the reinforcement body. The research results can provide the theoretical basis for laying the reinforcement body in the subregion.