输电线路掏挖式基础在倾斜荷载作用下的特性

CHARACTERISTIC OF DIGGING FOUNDATIONS OF TRANSMISSION LINES UNDER INCLINED LOADING

通过数值模拟对输电线路竖向和倾斜掏挖式基础在不同倾角荷载作用下的承载特性和内力分布进行分析。结果表明,直掏挖基础在小于10°的倾斜荷载作用下竖向承载力变化不大,随着荷载倾角的增加,竖向承载力明显减小。在相同倾角的荷载作用下,正斜掏挖式基础的竖向承载力要大于负斜掏挖式基础,直掏挖基础居中。同时,正斜掏挖式基础的弯矩和剪力均要小于负斜掏挖基础。掏挖式基础的倾角与荷载倾角相同情况下的基础受力最合理,不但可以保证基础承载力,而且基础所受弯矩几乎为零。

The bearing capacity characteristics and internal force distribution of transmission digging foundation with plumb and batter angle foundations under inclined loads are studied using extensive numerical modeling. The results reveal that the vertical bearing capacity of plumb foundations are changed less under the load inclination less than 10°, while the vertical bearing capacity remarkably decreases when the load inclination is greater than 10~. The vertical bearing capacity of foundation with positive batter angles is greater than the vertical and negative batter angles under the same inclined loading, meanwhile, the bending moment and shear force of foundation with positive batter angles are the less than the negative batter angles. In case of foundation batter angles are same with the load inclination proved to be the best configurations, the vertical bearing capacity is not decreased, on the other hand, the bending moment of this configuration is almost zero.