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桩的荷载试验曲线通常可分为如图1所示的三个阶段:压密阶段(0～1),局部剪切阶段(1～2) 和破坏阶段(2～3)。但许多桩的试验资料表明,桩顶荷载没有达到破坏阶段前,就有可能因沉降过大而不能满足建筑物的要求。因此,在确定桩的容许承载力时,与天然地基一样,除满足强度稳定条件(通常是以极限荷载P_u除以安全系数)外,还应满足变形条件。但现行的规范对变形条件没有明确规定或规定不当,如在《工业与
The load test curve of a pile can be generally divided into three stages as shown in Fig. 1 : compaction stage (0~1), local shear stage (1~2) and destruction stage (2~3). However, the test data of many piles indicate that before the pile top load has reached the destruction stage, it may be because the settlement is too large to meet the requirements of the building. Therefore, in determining the permissible bearing capacity of the pile, as with the natural ground, in addition to satisfying the strength stability conditions (usually the ultimate load P_u divided by the safety factor), the deformation conditions should also be satisfied. However, the current regulations do not clearly stipulate or stipulate the conditions of deformation, such as "Industry and