东南大学学报（自然科学版）2018，Vol.48Issue(1)：118-124,7.DOI:10.3969/j.issn.1001-0505.2018.01.018
大直径嵌岩桩桩端极限承载力计算方法
Calculation methods for ultimate end bearing capacity of large diameter rock-socketed piles
摘要
Abstract
To obtain the ultimate bearing capacity of the large diameter rock-socketed piles,three ul-timate states of the rock mass on the pile tip are considered,which are the continuous slip failure on the pile tip,the shear failure surrounding the pile tip and the fracture of the micro-cracks surrounding the pile tip.Based on two-dimensional, three-dimensional Hoek-Brown failure criteria and the mi-cro-crackⅠ-Ⅱcomposite criterion,four calculation methods for the ultimate bearing capacity of the pile end on the large diameter rock-socketed piles are proposed.Using the existed measured data, the proposed calculation methods are analyzed and verified.The results of the four proposed methods are close to the measured values,especially the result of the calculation method based on the Ⅰ-Ⅱcomposite criterion considering the fracture of the micro-cracks surrounding the pile tip.The size effect on the large diameter rock-socketed piles is further studied.The result show that the ultimate bearing load of the pile end is closely related to the rock-socketed depth and pile diameter, and the results show that the ultimate bearing load of the rock-socketed pile increases with the increasing of the rock-socketed depth and decreases with the increasing of the pile diameter.The results obtained by the calculation method based on the Ⅰ-Ⅱcomposite criterion considering the fracture of the mi-cro-cracks surrounding the pile tip are consistent with the observed results from the field among the four calculation methods.关键词
嵌岩桩/桩端端承力/计算方法/破坏模式/复合判据Key words
rock-socketed pile/pile end bearing capacity/calculation method/failure mode/compos-ite criterion分类
建筑与水利引用本文复制引用
张琦,刘军,戴国亮,龚维明..大直径嵌岩桩桩端极限承载力计算方法[J].东南大学学报（自然科学版）,2018,48(1):118-124,7.基金项目
国家自然科学基金青年基金资助项目(41602300)、江苏省青年基金资助项目(BK20150618)、中国矿业大学深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK1503)、贵州省交通厅科技资助项目(2015-122-051). （41602300）
