灰色系统理论在桩基竖向荷载试验中的预测应用研究
|
摘要
桩基极限承载力是基础设计及施工指导所需的重要参数,但是实际工程中将桩基加载至极限破坏状态极其困难。灰色系统理论作为一种新型预测方法,不仅可实现对桩基加载破坏时极限承载力的预测,且具有所需数据量少、预测精度高等特点。以桩基的竖向荷载静载试验中各级荷载作用下的荷载和沉降为研究对象,分析建立了基于灰色系统理论的预测模型,并用于预测桩基试验的荷载沉降规律。结果表明:灰色系统理论预测的沉降曲线与不同桩长的桩基础加载试验的实测沉降曲线间的误差较小,尽管灰色系统理论在不同桩长的预测规律误差方面有所差异,但灰色系统理论在桩基预测的整体预测效果上较为理想且具有较好的适用性。
The ultimate axial capacity of pile is an important parameter for the design and construction of pile supported foundations, however, it is difficult to statically load the pile to failure. As a new prediction method, the gray system theory can accurately predict the ultimate axial load at pile failure and needs fewer data points. This paper presents a gray system prediction model based on the deflections of pile head under different loadings in the pile axial static load tests and its application in the ultimate load prediction for other pile axial load tests. The following conclusions can be made: Although some errors might exist, the predicted pile head deflection using the gray system model are generally consistent with the static load test results on piles with various lengths. It is also concluded that the gray system theory has a good result in predicting the ultimate pile capacity of piles.
The ultimate axial capacity of pile is an important parameter for the design and construction of pile supported foundations, however, it is difficult to statically load the pile to failure. As a new prediction method, the gray system theory can accurately predict the ultimate axial load at pile failure and needs fewer data points. This paper presents a gray system prediction model based on the deflections of pile head under different loadings in the pile axial static load tests and its application in the ultimate load prediction for other pile axial load tests. The following conclusions can be made: Although some errors might exist, the predicted pile head deflection using the gray system model are generally consistent with the static load test results on piles with various lengths. It is also concluded that the gray system theory has a good result in predicting the ultimate pile capacity of piles.
引文
[1] 姜晨光.桩基工程理论与实践[M].北京:化学工业出版社,2010.
[2] 张忠苗.桩基工程[M].北京:中国建筑工业出版社出版,2007.
[3] 王成.桩基计算理论及实例[M].成都:桩基计算理论及实例,2010.
[4] 张学明.钻孔灌注桩极限承载力的研究[D].武汉:武汉理工大学,2003.
[5] 朱良虎.大直径深长钻孔灌注桩竖向承载力试验及有限元分析[D].重庆交通大学,2012.
[6] 戚科骏,徐美娟,宰金珉.单桩承载力的灰色预测方法[J].岩石力学与工程学报,2004,23(12):2069-2071.
[7] 周国林.单桩极限承载力的灰色预测[J].岩土力学,1991,12(1):37-43.
[8] 蒋建平.基于灰色模型GM(2,1)的大直径超长桩承载力预测[J].水运工程,2012(6):169-173.
[9] 陈鹏宇,段新胜.单桩承载力灰色预测优化模型及其精度分析[J].人民长江,2009(21):29-31.
[10] 钱宝源,刘干斌,陈忠.宁波地区单桩极限承载力GM(1,1)灰色模型预测[J].宁波工程学院学报,2011,23(4):83-89.
[11] 贾沛.灰色系统模型及其在环境评价与预测中应用的研究[D].武汉:武汉科技大学,2004.
[12] 曹文贵,张永杰,赵明华.基桩极限承载力的改进变步长灰色预测模型研究[J].岩土力学,2006(S2):774-778.
[13] 罗战友,董清华,龚晓南.未达到破坏的单桩极限承载力的灰色预测[J].岩土力学,2004,25(2):304-307.
[14] 杜勇立,王昌衡.灰色GM(1,1)模型在单桩极限承载力预测中的应用[J].公路工程,2008,33(4):166-168.
[15] 肖云,李先福.基于优化的灰色GM模型的滑坡预测[J].武汉工程大学学报,2012,34(1):31-35.
[16] 赵春雨,王连俊,张光宗.基于灰色理论的桩-筏复合地基沉降预测[J].铁道标准设计,2012(10):4-6.
[2] 张忠苗.桩基工程[M].北京:中国建筑工业出版社出版,2007.
[3] 王成.桩基计算理论及实例[M].成都:桩基计算理论及实例,2010.
[4] 张学明.钻孔灌注桩极限承载力的研究[D].武汉:武汉理工大学,2003.
[5] 朱良虎.大直径深长钻孔灌注桩竖向承载力试验及有限元分析[D].重庆交通大学,2012.
[6] 戚科骏,徐美娟,宰金珉.单桩承载力的灰色预测方法[J].岩石力学与工程学报,2004,23(12):2069-2071.
[7] 周国林.单桩极限承载力的灰色预测[J].岩土力学,1991,12(1):37-43.
[8] 蒋建平.基于灰色模型GM(2,1)的大直径超长桩承载力预测[J].水运工程,2012(6):169-173.
[9] 陈鹏宇,段新胜.单桩承载力灰色预测优化模型及其精度分析[J].人民长江,2009(21):29-31.
[10] 钱宝源,刘干斌,陈忠.宁波地区单桩极限承载力GM(1,1)灰色模型预测[J].宁波工程学院学报,2011,23(4):83-89.
[11] 贾沛.灰色系统模型及其在环境评价与预测中应用的研究[D].武汉:武汉科技大学,2004.
[12] 曹文贵,张永杰,赵明华.基桩极限承载力的改进变步长灰色预测模型研究[J].岩土力学,2006(S2):774-778.
[13] 罗战友,董清华,龚晓南.未达到破坏的单桩极限承载力的灰色预测[J].岩土力学,2004,25(2):304-307.
[14] 杜勇立,王昌衡.灰色GM(1,1)模型在单桩极限承载力预测中的应用[J].公路工程,2008,33(4):166-168.
[15] 肖云,李先福.基于优化的灰色GM模型的滑坡预测[J].武汉工程大学学报,2012,34(1):31-35.
[16] 赵春雨,王连俊,张光宗.基于灰色理论的桩-筏复合地基沉降预测[J].铁道标准设计,2012(10):4-6.