中空基础在输电线路黄土地基中的承载特性研究

随着杆塔基础承担的载荷不断增大,黄土地区常用的挖孔灌注桩呈现直径大、埋深大的工程特征,大大削弱了其经济性和环保性。联想到筒桩基础良好的工程性能,结合输电线路自身的行业特点和黄土的土质特性,提出了应用于黄土地区的中空基础。而对于中空基础的理论计算,没有现成的计算公式可以应用。基于单桩基础的内力和承载力理论计算方法,分析了中空基础相应的理论计算方法。利用数值模拟和现场原位试验,阐述了该理论计算方法的合理性,为中空基础的工程应用和设计提供参考;同时,现场原位试验表明中空基础承载力远远大于相应线路的设计值,可在工程中进行试点推广应用。

Bearing Capacity of Hollow Foundation in Loess Foundation of Transmission Line

With the increasing load of tower foundations, the commonly used bored piles in loess area are characterized by large diameter and deep buried, which greatly reduces their economic and environmental protection. Considering the good engineering performance of the tubular pile foundation, combined with the industry characteristics of the transmission line and the soil characteristics of the loess, the hollow foundation applied to the loess area is put forward. But for the theoretical calculation of the hollow foundation, there is no ready-made formula to be applied. Based on the theoretical calculation method of internal force and bearing capacity of single pile foundation, the corresponding theoretical calculation method of hollow foundation is analyzed. By using numerical simulation and in-situ experiment, the rationality of the theoretical calculation method is expounded, which provides references for engineering application and design of hollow foundations; At the same time, the in-situ tests in the field show that the bearing capacity of the hollow foundation is far greater than the design value of the corresponding line and can be popularized and applied in pilot projects based on the project