临江软土地基堤路结合工程合理拼接台阶尺寸研究

堤路拼接工程中，既要考虑到新老路堤的变形协调性，又要不影响到老堤的防洪作用，因此合理的台阶尺寸选择非常重要。通过有限元模拟，分析了不同尺寸拼接台阶对于堤路拼接质量的影响。模拟结果表明，设置拼接台阶能够有效改善拼接处的剪应力分布情况，缓解坡脚的应力集中，使新老路基更加有效衔接，但过大的台阶尺寸也会降低拼接质量，应控制开挖台阶尺寸。合理的台阶尺寸应同时考虑拼接处与两侧路基的变形协调性，同时也应考虑对既有老堤稳定性的影响。综合考虑各不同断面设置方案的数值模拟结果，确定最优的拼接台阶尺寸为0．8×1．85m。研究结果将为堤路结合工程的设计和施工提供借鉴和指导作用。

Splicing Step Size Select of the Bank-road Combination Embankment on Soft Ground by the Yangtze River

During the combination of bank and road, the compatibility of deformation between the old and new embankment and the influence of new embankment on the flood control function of old bank are both need to be taken into account. Thus, the selection of a reasonable splicing step size is important in construction. The effect of splicing stepsize on embankment safety is analyzed using finite element method. Simulation results show that the splicing step can modify the distribution feature of shear stress, reduce the stress concentration at the foot of slope, and also improve the splicing effect between the new embankment and old bank. When the step size exceeds certain value, however, the splicing effect will decrease. So, practical step size should be selected for given engineering construction. Considering the compatibility of deformation between the old bank and new embankment and the effect of new embank- ment on the stability of old bank, a practical splicing step size is put forward for Riverside Avenue of Pukou New City, Jiangsu Province. The optimal step size obtained by simulation is 0.8 x 1.85 m. The results can throw light on design and construction of the combination of bank and road.