中南大学学报（自然科学版）2016，Vol.47Issue(11)：3839-3845,7.DOI:10.11817/j.issn.1672-7207.2016.11.030
考虑长径比和容许沉降影响的群桩SLS可靠度分析
Reliability analysis for serviceability limit state of pile groups considering pile length-diameter ratio and limiting tolerable settlement
摘要
Abstract
The model uncertainties for serviceability limit state (SLS) and ultimate limit state (ULS) of piles were considered in order to establish a linear equation between the reliability indices for SLS and ULS of single piles using the probability and statistics theory. Then a method was presented to evaluate the reliability for SLS of pile groups in combination with the method of reliability analysis for ULS of pile groups. Finally, the influence of pile length-diameter ratio (L/D) and limiting tolerable settlement (slt) on the reliability analysis for SLS of pile groups was studied utilizing pile test data. The case study indicates that there existed the significant impact of L/D on the reliability indices for SLS of pile groups. And for non-cohesive soils, when L/D was smaller than 10 or between 20 and 30, the larger reliability indices for SLS of pile groups could be achieved. For cohesive soils, when L/D was between 20 and 30, the larger reliability indices for SLS of pile groups could be obtained. In addition, the reliability indices for SLS of pile groups generally increased with an increase of slt although the increase rate gradually diminished. Especially for slt exceeding 25 mm, the variation of the reliability indices for SLS of pile groups was very small. So for larger slt values, the ULS designs rather than the SLS designs played a decisive role in the reliability-based design of pile foundations.关键词
群桩/可靠度/正常使用极限状态/长径比/容许沉降Key words
pile group/reliability/serviceability limit state/length-diameter ratio/limiting tolerable settlement分类
建筑与水利引用本文复制引用
边晓亚,郑俊杰,徐志军,章荣军..考虑长径比和容许沉降影响的群桩SLS可靠度分析[J].中南大学学报（自然科学版）,2016,47(11):3839-3845,7.基金项目
国家自然科学基金资助项目(51278216，51308241)；教育部高等学校博士学科点专项科研基金资助项目(20130142120029)；河南工业大学高层次人才基金资助项目(2013BS010)(Projects(51278216,51308241) supported by the National Natural Science Foundation of China （51278216，51308241）
Project(20130142120029) supported by the Research Fund for the Doctoral Program of Higher Education of China （20130142120029）
Project(2013BS010) supported by Henan University of Technology Fund for High-level Talents) （2013BS010）
