摘要
为了更好地研究软土地区爆扩桩的抗拔承载力问题,在相关文献和试桩试验的成果基础上,提出了一个计算模型,据此模型推导出了适用于软土计算爆扩抗拔桩极限承载力的计算公式。在极限状态下,假定在扩大头段和扩大头影响段破裂面成对数螺旋线破坏和直线破坏,在等截面段形成幂函数曲线破裂面。结合抗拔桩试验和相关文献的算例,研究结果表明,本文的计算结果与实际值基本吻合,验证了此计算公式的合理性和适用性。该计算公式也适用于等截面抗拔桩极限承载力计算,结果可为工程中桩基础设计提供参考。
In order to study bearing capacity of explosive expanded pile in soft soil ground better,a calculation model is put forward based on the relevant study and test pile results.On basis of the model,the formula is established to estimate the ultimate bearing capacity of explosive expanded piles in soft soil ground.Under the limit condition,it is supposed to form fracture surface of logarithmic-spiral line and straight line on the enlarged.While in the straight shaft,a power function of slip surface is assumed.However,length is difficult to estimate.Combined with test of enlarged base pile and the case of the relative engineering,comparisons of the results of the solution with those of the model test show generally favorable agreement,proving that the present method is feasible and suitable.Also,the computational formula fits to calculate the ultimate bearing capacity of straight-shaft uplift piles.And it may be referenced in engineering designing.
作者
康正炎
凌建璋
张磊
张扬
KANG Zhengyan;LING Jianzhang;ZHANG Lei;ZHANG Yang(Anhui and Huai River Water Resources Research Institute,Bengbu233000,China;Anhui Construction Engineering Quality Supervision and Testing Station,Hefei 230000,China)
出处
《四川建筑科学研究》
2019年第3期97-101,共5页
Sichuan Building Science
关键词
爆扩桩
极限承载力
破裂面
极限平衡法
explosive expanded pile
ultimate capacity
fracturesurface
limit equilibrium method
