摘要
输电线路混凝土板条与角钢支架组合的装配式基础已在工程中得到应用,由于底板板条间存在空隙,基础在下压计算时底板面积取值尚不明确。通过地基土极限承载力理论分析,相邻板条间存在土拱效应,可将整个底板下的浅层土体近似等效为刚性体共同抵抗下压荷载。不同板条间距的现场试验表明,板条间距变化对荷载位移曲线基本无影响,板条下与空隙处的土压力差值在3倍底板宽度埋深时差距较小,在5倍底板宽度埋深时差别可忽略,且由于应力扩散作用板条间距变化对深层土压力无影响。根据理论研究与现场试验成果,建议装配式基础在下压计算时底板计算原则应按照底板板条包围的整体面积进行计算。
The assembled foundation for transmission line, which is composed of concrete laths and angle steel scaffolds, has been applied to practice. Due to the gap of laths, the bottom area of the foundation is not clearly defined when calculating the compressive load. Theoretical research on the ultimate bearing capacity of foundation indicates that soil arching effect exists between the adjacent slabs. The shallow soil under the slab of assembled foundation can be approximately equivalent to a rigid body, which resists the compressive load together with the slabs as a whole. The in-site experiments at different lath intervals testify that the difference of soil pressures under the laths and at the gap of laths is relatively large in the shallow soil. But the soil pressures are basically the same in the deep layer where the change of the lath interval has no significant impact on soil pressure. The difference value between soil pressure under the laths and that at the gap of laths is small in the position of 3times laths width. And the difference value can be neglected in the position 5 times laths width. The research result suggests that the whole area surrounded by the laths is preferable in the calculation of compressive load on the assembled foundation composed of concrete laths.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2016年第S1期477-481,共5页
Rock and Soil Mechanics
基金
国家电网公司科技项目(No.GCB17201500141)~~
关键词
输电线路
装配式基础
混凝土板条
下压承载计算
现场试验
transmission line
assembled foundation
concrete lath
calculation of compressive load
in-site experiment
