东南大学学报（自然科学版）2025，Vol.55Issue(6)：1541-1548,8.DOI:10.3969/j.issn.1001-0505.2025.06.006
山区输电铁塔微型桩-压力型锚杆复合基础抗拔特性试验与理论分析
Experimental and theoretical analysis of uplift resistance characteristics for micropile-pressure-type anchor composite foundations in mountainous transmission tower
摘要
Abstract
To meet the requirements for mechanized construction of transmission tower foundations in moun-tainous areas,a micropile-pressure-type anchor composite foundation was proposed.This foundation features small dimensions,strong adaptability to terrain,and low mechanical power requirements.Field in-situ tests and theoretical analysis were conducted.Distributed optical fiber sensing technology was used to measure the strain distribution of the foundation.Key parameters including the load-displacement curve,axial force trans-fer law,and load-sharing ratio were obtained.The force transfer mechanism and uplift resistance bearing char-acteristics of this composite foundation were studied.Based on deformation coordination and force equilibrium conditions,a theoretical model for the micropile-pressure-type anchor composite foundation was established.By comparing with field test results,the accuracy and reliability of the model were verified.Results show that the uplift bearing capacity of this composite foundation is increased by more than 15.7%compared with a single pressure-type anchor foundation and by more than 87.3%compared with a micropile foundation.Em-bedding the micropile 0.5 m into rock increases the ultimate bearing capacity by 45%,while simultaneously reducing the failure displacement by 56.7%.With increasing load,the load-sharing ratio of the micropile gradually decreases,while the corresponding load-sharing ratio of the pressure-type anchor gradually in-creases.This provides a basis for the design calculation of this new foundation type.关键词
输电铁塔基础/复合基础/微型桩/压力型锚杆/现场试验/理论模型Key words
transmission tower foundation/composite foundation/micropile/pressure-type anchor/field test/theoretical model分类
建筑与水利引用本文复制引用
吕庆,张淇,李攀峰,周吉安,冯炳..山区输电铁塔微型桩-压力型锚杆复合基础抗拔特性试验与理论分析[J].东南大学学报（自然科学版）,2025,55(6):1541-1548,8.基金项目
国家电网公司资助项目(5200-202419101A-1-1-ZN) （5200-202419101A-1-1-ZN）
绍兴建元电力集团有限公司资助项目(CF058506002022001). （CF058506002022001）
