变分解法对输电杆塔回填土体基础上拔角的研究  

Variational Solution Study on the Uplift Angle of Backfill Foundation of Transmission Tower

作　　者：张永建 张世隆 陈杰 ZHANG Yong-jian;ZHANG Shi-long;CHEN Jie(Hainan Electric Power Design&Research institute of Power China Co.,Ltd.,Haikou 571100,China;Hainan Power Grid Co.,Ltd.,Haikou 570203,China)

机构地区：[1]中国电建集团海南电力设计研究院有限公司,海口571100 [2]海南电网有限责任公司,海口570203

出　　处：《电力学报》2021年第1期67-72,共6页Journal of Electric Power

摘　　要：根据《架空输电线路基础设计技术规程》(DL/T5219-2014)[1],回填土基础土按照"土重法"计算,发生上拔破坏时,上拔角按照经验值确定存在一定理论缺陷;通过变分法原理,建立静力学平衡方程,结合相应边界条件,得到回填土基础上拔破坏面基本方程以及滑裂面上正应力方程,相应获得输电线路回填土基础土体上拔极限承载力理论计算公式;再根据该理论计算,分析了内摩擦角、黏聚力、基础埋深对计算上拔角以及上拔极限承载力的影响,指出了"土重法"计算回填土基础上拔承载力时存在的问题。According to the soil weight method from Technical Code for design of foundation of overhead transmission line(DL/T5219-2014)[1], when the backfill foundation occurs uplift failure, there are some theoretical defects in the determination of uplift angle on the basis of empiric value. Basic equation of uplift failure surface of backfill foundation and normal stress equation of sliding surface can be got by the equation of static equilibrium established by the variational solution and corresponding boundary conditions. The theoretical calculation formula of the uplift ultimate capacity can be also got. The influence of the internal friction angle, cohesion and foundation depth on the calculation of uplift angle and uplift ultimate capacity is analyzed. The defect is pointed out when uplift capactiy of backfill foundation is calculated by the soil weight method.

关 键 词：输电杆塔 上拔角 极限承载力 变分法 黏聚力 基础埋深 

分 类 号：TU470.3[建筑科学—结构工程]