黏性土-风化岩地层中钻孔灌注抗拔桩承载力时效性分析

TIME EFFECT ON BEARING CAPACITY OF UPLIFT BORED PILE IN THE FORMATIONS OF CLAY AND WEATHERED ROCK

对位于黏性土-风化花岗岩地基中钻孔灌注抗拔桩承载力时效性的研究,对揭示黏性土-风化岩层中桩基承载力具有深远的意义。结合深圳前海填海区某工程的基桩实测数据,对钻孔灌注抗拔桩承载性能的时效性进行分析。结果显示：深圳前海填海区黏性土-风化岩中钻孔灌注抗拔桩的抗拔承载力时效性明显,前期抗拔桩承载力增长速度很快,随着休止期的延长,增长速度逐渐减慢。统计结果显示：桩基动刚度与桩基承载力两者之间联系密切且呈线性正相关,相关系数R=0.981 65。

Research on the time effect on the bearing capacity of the uplift bored pile has profound guiding significance for studying the bearing capacity of the pile foundation in the formation of clay and weathered granite rock. The time effect analysis of the bearing capacity for the uplift bored pile was implemented based on a pile foundation project in the reclamation zone of Qianhai,Shenzhen. The results showed that the time effect of uplift resistance for the uplift bored pile in the formation of clay and weathered rock was obvious. The bearing capacity increased rapidly in the early stage,and then slowed down with the extension of the rest period. The dynamic stiffness and the bearing capacity of the piles were closely related and showed a linearly positive correlation with a correlation coefficient of 0. 981 65.