输电线路原状土基础抗拔极限承载力计算

根据经典土力学极限平衡状态下土微元体静力平衡方程式、Mohr-Cou lomb屈服准则和滑移线场理论,建立了输电线路原状土杆塔基础上拔极限平衡状态时滑动面上的应力分布基本方程式,并根据有关文献成果引入土体破裂面方程和边界条件假设,得到了输电线路原状土基础土体滑裂面抗拔极限承载力理论计算公式。通过该理论计算结果与《架空送电线路基础设计技术规定》“剪切法”计算结果的对比分析,指出了“剪切法”计算原状土基础上拔承载力时存在的问题,并给出了输电线路原状土基础抗拔极限承载力理论计算公式。

Calculation on Ultimate Uplift Bearing Capacity of Undisturbed Soil Foundation in Transmission Lines

Based on the theory of limiting equilibrium,the Mohr-Coulomb yielding criterion and slip-line field method,the fundamental equations of stress distribution on the failure plane have been established about the undisturbed soil foundation in transmission line engineering while the uplift limiting condition.According to the previous researching results,the equation of the failure plane of the soil and the set of boundary conditions have been introduced.And as a result,the theoretical calculation equation about the ultimate uplift bearing capacity of the failure plane along the undisturbed soil foundation has been obtained.The existing problem have been pointed out by comparing the results of this theoretical calculation equation with those of the "Technical regulation for designing foundation of overhead transmission line".