中南大学学报（自然科学版）2017，Vol.48Issue(2)：512-524,13.DOI:10.11817/j.issn.1672-7207.2017.02.032
强风化花岗岩中嵌岩短桩承载特征原位试验与有限元分析
In-situ test and FEM analysis on bearing characters of rock-socketed short pile for highly weathered granite
摘要
Abstract
The bearing behavior and load transfer mechanism of the rock-socketed short pile were studied by the experimental and FEM analysis of two case history of 11 single short piles in weathered rock foundation of Qingdao. The influences of aspect ratio (L/d), rock-socketed length (hr) and bedrock strength (Ep/Er) on bearing behaviors of rock-socketed short were discussed by FEM analysis of bearing characters of large-diameter rock-socketed short piles. The results show that the ultimate bearing capacity of rock-socketed short is higher, and settlement is smaller, which can be satisfied with engineering demands and has high security reserves. Moreover, the change of ultimate bearing capacity of single pile is not obvious with the increase of pile lengths, which proves that the 11 piles are of strong end bearing properties. The pile side friction peak decreases with the increase ofL/d; the pile top settlement increases with the increase ofL/d. Under different rock-socketed lengths, the attenuation law of axial force is consistent; the pile top settlement decreases with the increase ofhr, and the ratio of base resistances to the bearing capacities (Qp/Qu) decreases with the increase ofhr. The pile top settlement increases with the increase ofEp/Er,Qp/Qu increases with the increase of Ep/Er. The research results can provide references for rock-socketed short pile design in similar geological conditions.关键词
强风化花岗岩/嵌岩短桩/极限承载力/承载性状/原位测试/有限元Key words
highly weathered granite/rock-socketed short pile/ultimate bearing capacity/bearing behavior/in-situ test/FEM分类
建筑与水利引用本文复制引用
白晓宇,张明义,朱磊,王永洪,王静静..强风化花岗岩中嵌岩短桩承载特征原位试验与有限元分析[J].中南大学学报（自然科学版）,2017,48(2):512-524,13.基金项目
国家自然科学基金资助项目(51078196,41502304) （51078196,41502304）
教育部高等学校博士学科点专项科研基金资助项目(20133721120004)(Projects(51078196, 41502304) supported by the National Natural Science Foundation of China （20133721120004）
Project(20133721110004) supported by Research Fund for the Doctoral Program of Higher Education of China) （20133721110004）
