输电线路岩石嵌固基础关键设计参数研究

Design Parameters Determination of Rock Embedded Foundation in the Transmission Line

岩石嵌固基础已成为山区输电线路常用的基础型式之一,岩石嵌固基础在进行上拔承载力计算时的关键参数为岩石等代极限剪切强度,并已成为输电线路工程岩石类基础设计的控制性参数。基于14个场地、62个基础的现场原位试验成果,分析其抗拔承载性能与破坏特点,反算得到了岩石等代极限剪切强度参数取值。与现有规范相比,取值得到显著提高,特别是强风化岩石时提高50%以上,经济性显著,有效支撑规范修编,供设计参考。

As one common foundation type of transmission line in mountain areas,the uplift bearing capacity calculation to rock embedded foundation has become the controlling parameters in Ultra High Voltage transmission line engineering.Based on the in-situ test results of14sites and62experiments to rock embedded foundation,the uplift bearing capacity and failure characteristics are analyzed,the corresponding equivalent ultimate shear stress of rock mass are presented.By inverse calculation,the parameter values for equivalent ultimate shearing strength for different rock mass are obtained.Compared with the existing regulations,the parameter values have been improved significantly which increase more than50%to highly weathered rocks.The rock embedded foundation have good economic and social benefits.The conclusion can support effectively codes revision and provide references for rock foundation design.