南宁软岩地基大直径灌注桩极限承载力预测

doi:10.11988/ckyyb.20160904

院报 ›› 2017, Vol. 34 ›› Issue (12): 73-77.DOI: 10.11988/ckyyb.20160904

南宁软岩地基大直径灌注桩极限承载力预测

江杰^{1a, 1b, 2}, 陈骏^1a, 肖萌^1a, 韦永超³, 马少坤^{1a, 1b, 2}

1. 广西大学 a.土木建筑工程学院;b.广西防灾减灾与工程安全重点实验室,南宁 530004;
2.桂林理工大学广西岩土力学与工程重点实验室,广西桂林 541004;
3.中国市政工程西北设计研究院有限公司,兰州 730000

收稿日期:2016-09-05 出版日期:2017-12-01 发布日期:2017-12-22
作者简介:江杰(1979-),男,湖北麻城人,教授,硕士生导师,博士后,主要从事岩土地下工程的教学与研究工作,(电话)18878884176(电子信箱)jie_jiang001@126.com。
基金资助:
国家自然科学基金项目(51568006,41362016); 中国博士后科学基金项目(2017M612865); 广西重点实验室系统性研究项目(2016ZDX11);广西岩土力学与工程重点实验室资助课题(14-KF-03,13-KF-02); 广西博士后专项资助项目

Prediction of Ultimate Bearing Capacity of Bored Pile of LargeDiameter in Soft Rock Foundation in Nanning

JIANG Jie^{1, 2, 3}, CHEN Jun¹, XIAO Meng¹, WEI Yong-chao⁴, MA Shao-kun^{1, 2, 3}

1.College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2.Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China;
3.Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin University ofTechnology, Guilin 541004, China;
4.CSCEC AECOM Consultants Co.,Ltd., Lanzhou 730000,China

Received:2016-09-05 Online:2017-12-01 Published:2017-12-22

摘要/Abstract

摘要： 南宁市下伏泥岩粉砂岩地基具有显著的浸水崩解软化特性,使得该地基大直径灌注桩承载力难以确定。依托南宁市火车东站南广场高架平台工程软岩互层地基大直径灌注桩项目,对该工程2根群桩基桩进行了静载试验研究。针对试验中试桩未达到破坏其极限承载力难以确定问题,采用指数函数拟合法和数值反演分析法来预测其荷载沉降性状和极限承载力,并进行对比分析。结果表明:软岩互层地基桩基荷载沉降性状为缓变型,表现出端承摩擦桩的特性,可用指数函数来描述试桩受荷性状,并结合数值反演分析来预测其极限承载力,目前常用的桩基设计方法低估了该地基中基桩的承载力。

关键词: 灌注桩, 静载试验, 极限承载力预测, 指数模型, 数值反演分析

Abstract: The bearing capacity of cast-in-place bored pile of large diameter in soft rock foundation in Nanning is difficult to determine due to softening and disintegration characteristics when soaked in water. Static load test was conducted to determine the bearing capacity of bored pile in the soft rock interbedding foundation of an elevated platform project in the railway station of Nanning Ciy. Both exponential function fitting method and numerical back analysis were used to accurately predict the load-settlement relation and ultimate bearing capacity of test pile which did not reach the ultimate state. Results show that the load-settlement curve of bored pile in soft rock interbedding foundation is an adjustment curve and the pile works as end bearing friction pile. As common design methods of pile foundation at present underestimates the bearing capacity of pile in this foundation, exponential function which is used to describe the load-settlement behaviour of test pile and numerical back analysis can be combined to estimate the ultimate bearing capacity of test pile.

Key words: bored pile, static load test, prediction of ultimate bearing capacity, exponential model, numerical back analysis

中图分类号:

TU473.1

江杰, 陈骏, 肖萌, 韦永超, 马少坤. 南宁软岩地基大直径灌注桩极限承载力预测[J]. 院报, 2017, 34(12): 73-77.

JIANG Jie, CHEN Jun, XIAO Meng, WEI Yong-chao, MA Shao-kun. Prediction of Ultimate Bearing Capacity of Bored Pile of LargeDiameter in Soft Rock Foundation in Nanning[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2017, 34(12): 73-77.

[1]	张福友, 冯健雪, 陆志宇, 杨济铭, 梅国雄. 喀斯特地区新型异形灌注桩承载特性与影响因素试验研究[J]. 院报, 2021, 38(2): 92-99.
[2]	管金萍, 张明义, 白晓宇, 李方强. 印尼地区嵌岩灌注桩竖向承载特性现场试验[J]. 院报, 2020, 37(6): 134-140.
[3]	费逸, 李旺辉, 赵春风, 王有宝, 吴悦. 砂土原位应力场中的灌注桩成孔卸荷收缩理论解[J]. 院报, 2020, 37(4): 168-174.
[4]	谢书萌. 基于有限差分法的下伏岩溶对桩基承载特性的影响[J]. 院报, 2019, 36(4): 77-81.
[5]	张世民, 王虹波, 张四凤, 景峰卫, 李宗帅. 后压浆桩抗压与抗拔现场对比试验[J]. 院报, 2018, 35(3): 135-138.
[6]	刘永莉，肖衡林，胡其志，马强，李丽华. 基于DTS的灌注桩完整性检测方法研究[J]. 院报, 2017, 34(6): 124-127.
[7]	吕文志,饶锡保,徐晗,程永辉. 格栅状搅拌桩复合地基静载试验研究[J]. 院报, 2016, 33(6): 65-69.
[8]	徐晗, 饶锡保, 吕文志, 程永辉. 格栅状搅拌桩复合地基静载试验数值模拟研究[J]. 院报, 2016, 33(5): 102-104.
[9]	范萌,雷文凯,肖衡林,刘永莉. 夹泥灌注桩的光纤传感检测模型试验[J]. 院报, 2016, 33(4): 95-98.
[10]	叶朝良, 刘尧军, 冯怀平. 端夯扩碎石桩复合地基现场试验研究[J]. 院报, 2016, 33(2): 62-66.
[11]	陈筠,王鹏程,季永新,张斌斌. 较破碎岩体中桩基竖向承载力分析与探讨[J]. 院报, 2016, 33(10): 98-101.
[12]	刘阳,刘阳,李建方. 泵站单桩基础水平承载特性数值模拟分析[J]. 院报, 2015, 32(4): 92-95.
[13]	边智华，余美万，周建军. 丹江口库区郧县汉江二桥嵌岩桩基岩承载力特性试验研究[J]. 院报, 2013, 30(1): 42-46.
[14]	齐师杰，张行南，夏达忠，刘扬扬，刘伯娟. 嘉陵江流域土地利用/覆被变化特征及其驱动力分析[J]. 院报, 2013, 30(1): 1-7.
[15]	张利洁, 边智华, 景锋, 唐辉明, 杨喜庆, 叶红卫, 毕承. 越南海防热电厂二期工程超长大直径灌注桩荷载传递机理试验研究[J]. 院报, 2012, 29(3): 55-58.

南宁软岩地基大直径灌注桩极限承载力预测

Prediction of Ultimate Bearing Capacity of Bored Pile of LargeDiameter in Soft Rock Foundation in Nanning

PDF

可视化

摘要/Abstract

引用本文

使用本文

相关文章 15

编辑推荐

Metrics

本文评价