摘要:
通过对相邻 2 盘间破坏面形态的分析,总结了支盘桩整体破坏面形态的判断方法,推导出了基于最小抗力的支盘桩承载力和临界盘间距计算公式,并进行了验证。在相邻 2 盘间可能出现的破坏面有大圆柱形和小圆柱形两种,最可能出现的是抗力最小者。支盘桩的整体破坏面是各段抗力最小的破坏面的组合,各段的最小抗力之和即是整根支盘桩的总承载力；支盘桩所有可能出现的整体破坏面中抗力最小者即为支盘桩的承载力。在判别受压支盘桩的整体破坏面状态时,要按照从下往上的顺序,最上 段和最下段桩干处的破坏面是小圆柱形；对受拉桩,要按照从上往下的顺序,最下段桩干处的破坏面是小圆柱形。
Abstract:
By analyzing the shape of failure surface between two neighboring plates, the integral failure surface judgment method of the cast-in-situ piles with expanded branches and plates is summarized. The formulae for the bearing capacity and the critical plate spacing based on th minimum resistance of the pile are deduced and verified. There are two types of failure surface between two neighboring plates — large cylindrical surface and small cylindrical one, and the most possible one is the smaller resistance. The overall failure surface is the combination of each failure surface with the minimum resistance, and the sum of the minimum resistance of each section is the total bearing capacity of the whole pile. The bearing capacity of the pile is the minimum resistance of all kinds of overall failure surfaces that may appears along the whole pile. For the bearing pressure on the pile, we should obey the order from bottom to top to judge the type of overall failure surface of the pile, and the failure surface of the most upside and the most lower segment of the pile body is the small cylindrical one. For the bearing tensile force on the pile, we should obey the top-down order, and the failure surface of the most lower segment of the pile body is the small cylindrical one.
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