【摘要】 通过自制的模型试验箱，对基坑工程中排桩支挡墙桩间的土拱效应及其破坏机理进行了研究，并在模型试验的基础上，通过有限元模拟对试验进行了补充和验证，并基于合理拱轴线的假设，建立了排桩支挡墙桩间土拱受力的计算模型。研究结果表明，排桩支挡墙桩间土拱破坏时，拱脚处先产生裂缝，随着水平土压力的增大，裂缝逐渐扩展至拱顶并与另一半的拱裂缝贯通，最后坑内方向桩间土体完全脱离拱带土体。随着桩间距的增大，土拱所能承受的最大荷载降低。在能够形成土拱的前提下，桩间距越大，土拱破坏时的矢高越大。随着荷载的增大，土拱的矢高逐渐减小。在相同的荷载下，桩间距越大，土体的应力偏转程度越大。更多还原

【Abstract】 Through a self-made model test box, the soil arch effect and its failure mechanism among the piles of the rowed pile retaining wall in deep excavation support are studied. The experiment is calibrated and verified through the finite element simulation. Based on the assumption of a reasonable arch axis, an analytical model for the soil arch force among piles of the rowed pile retaining wall is established. The results indicate that when the soil arches among piles of the rowed pile retaining wall is damaged, cracks first appear at the bottom of the arch. As the horizontal soil pressure increases, the cracks gradually expand to the top of the arch and connect with the other half of the arch cracks. Finally, the soil among the piles in the direction of the excavation completely separates from the soil in the arch zone. As the spacing among piles increases, the maximum load that the soil arch can withstand decreases. On the premise of being able to form soil arches, the larger the pile spacing, the greater the height of the arrow when the soil arches fail. As the load increases, the height of the soil arch gradually decreases. Under the same load, the larger the pile spacing, the greater the degree of stress deflection of the soil.更多还原