基于同心拱模型的桩承式加筋路堤简化分析方法

Simplified analysis method of geosynthetic-reinforced pile-supported embankment based on concentric arches model

为准确、便捷地分析桩承式加筋路堤中加筋体的受力和变形特性,提出了一种正方形和正三角布桩形式下的三维简化分析方法.首先考虑加筋体的空间变形形态,假设内部区域和条带区域加筋体的变形曲面分别为旋转抛物面和抛物柱面;然后根据同心拱模型基本原理,推导出作用在加筋体上方荷载的简化表达式;最后通过求解加筋体在三维空间内竖向力的平衡方程,得出加筋体的最大竖向变形和最大拉力、桩顶平均应力、桩间土平均应力以及荷载传递效率.利用所提方法对2个工程案例进行计算,并将计算值与实测值进行对比分析.结果表明,应用该简化分析方法所得的计算值与实测数据吻合良好,荷载传递效率的最大计算误差约为6%,从而验证了该方法的有效性.

To accurately and conveniently analyze the stress and deformation of the geosynthetics in geosynthetic-reinforced pile-supported embankments,a three-dimensional simplified analysis method applicable to the piles in square or regular triangle pattern was proposed.Firstly,considering the spatial deformation of the geosynthetics,the deformed surfaces in the inner area and strip area were assumed to be a paraboloid of revolution and a parabolic cylinder,respectively.Then,according to the theory of the concentric arches model,the simplified expressions for the load acting on the geosynthetics were derived.Finally,by solving the equilibrium equations of the vertical forces of the geosynthetics in the three-dimensional space,the maximum vertical deflection and the maximum tensile force of the geosynthetics,the average stress on the pile head,the average stress on the soil surface between the piles,and the load transfer efficiency were obtained.Two engineering cases were calculated by the method,and the calculation results were compared with the measured values.The results show that the calculation values obtained by the simplified analysis method agree with the measured data.The maximum calculation error of the load transfer efficiency is about 6%,proving the effectiveness of the method.