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桩承加筋路堤中褥垫层对桩土应力的调整起了十分关键的作用。桩土应力比是桩土应力调整结果的直接表现,而路堤土拱效应以及褥垫层刚性承台效应对荷载调整作用正是桩土应力调整过程的体现。利用有限元对路堤荷载下PCC单桩以及加固范围内的土体进行了数值模拟。通过分析认为,褥垫层对桩土应力调整的过程和结果均会产生影响,随着褥垫层模量、厚度、粘聚力以及内摩擦角的增加,土拱效应虽会遭到削弱,但褥垫层刚性承台作用明显增强,最终导致更多的荷载转移到桩体上,桩土应力比增加。通过总结认为,改善褥垫层性质,加强其对桩顶局部压入作用的限制是保证桩体承担较多荷载的关键。
Pile bearing reinforced embankment cushion on the pile soil stress adjustment plays a very crucial role. The stress ratio between pile and soil is the direct result of pile-soil stress adjustment. The effect of embankment soil arching and the effect of rigid cap-bearing effect on load adjustment is exactly the process of pile-soil stress adjustment. The finite element method is used to simulate the PCC single pile under embankment load and the soil within the consolidation range. According to the analysis, the effect of cushion on the process and result of pile-soil stress adjustment will be affected. With the increase of cushion modulus, thickness, cohesion and internal friction angle, soil arching will be weakened, However, the effect of the rigid cap of the mattress was obviously enhanced, eventually leading to more load transfer to the piles and the pile-soil stress ratio increased. It is concluded that the improvement of the properties of the cushion and the strengthening of its restriction on the local pushing-in of the pile top are the keys to ensure that the pile can bear more loads.