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超深基坑的开挖会对坑底工程桩的抗压承载力和沉降特性产生影响,但是目前对开挖深、宽度、有效桩长等影响因素的研究较少。通过模拟对比套管试桩和开挖后坑底试桩两种工况,可以反映开挖对桩的承载力和竖向刚度的影响。研究发现,以坑底桩的开挖前承载力和刚度为基准进行归一,得到的相对承载力和相对竖向刚度,随着相对开挖宽度和相对开挖深度的增大而降低,随着相对有效桩长的增长而提高。
The excavation of ultra deep foundation pit will have an impact on the compressive bearing capacity and settlement characteristics of pit-bottom engineering piles. However, there are few researches on the influencing factors such as excavation depth, width and effective pile length. By simulating the casing test pile and excavation bottom pit test pile two conditions, can reflect the excavation of the pile bearing capacity and vertical stiffness. It is found that the relative bearing capacity and relative vertical stiffness obtained by the excavation before foundation excavation are normalized with the relative excavation width and relative excavation depth decreasing, The growth of relatively effective pile growth and increase.