岩土力学Issue(7)：1871-1877,7.
戈壁地基扩底掏挖基础抗拔试验及其位移计算
Uplift field tests and displacement prediction on belled piers in gobi
摘要
Abstract
The field tests of 46 uplift-loaded belled piers were carried out at 7 gobi gravel sites in Gansu and Xinjiang, respectively. Based on the characteristics of the measured load-displacement curves, the L1-L2 method was used to obtain the ultimate bearing capacities and corresponding displacements. In addition, a normalized hyperbolic equation was applied to fit the measured load-displacement data. Accordingly, the fitting parameters of hyperbolic curve were provided and analyzed. A method was suggested for determining the allowable displacement and corresponding load by considering the uncertainties in the ultimate capacity model and the normalized load-displacement hyperbolic model. The uplift load-displacement curves of belled piers in gobi could be simplified to a generic load-displacement curve with three distinct stages:an initial linear stage, a nonlinear transition stage, and a final linear failure stage. The normalized load-displacement hyperbolic equation could be used effectively to fit the measured load-displacement data. The uncertainty in the normalized load-displacement hyperbolic curve could be studied by the corresponding fitting parameters of hyperbolic curve. The method to determine the allowable displacement and corresponding load would be more safety by considering capacity and displacement together.关键词
戈壁/扩底基础/归一化荷载-位移曲线/抗拔/双曲线模型Key words
gobi/belled piers/normalized load-displacement curve/uplift/hyperbolic model分类
建筑与水利引用本文复制引用
鲁先龙,乾增珍,童瑞铭,郑卫锋..戈壁地基扩底掏挖基础抗拔试验及其位移计算[J].岩土力学,2014,(7):1871-1877,7.基金项目
国家自然科学基金青年基金项目(No.51208480)；国家电网公司科技项目(No. GCB17201200123)。 （No.51208480）
