我国杆塔基础设计行业标准DL/T 5219—2005《架空送电线路基础设计技术规定》正在修订中，杆塔基础抗拔“剪切法”计算参数A1和A2是重要的一项修订内容。通过对国内外3种典型基础抗拔理论计算模型的分析，建立了输电线路杆塔基础抗拔承载力统一计算模型和理论公式；给出了基于土体滑动面不同形态假设下的基础抗拔“剪切法”计算参数A1和A2统一理论公式；分析了其取值与土体滑动面形态、内摩擦角、基础深埋比的关系，研究成果可为杆塔基础工程设计及相关技术规范制（修）订提供参考。

The industry design standard of tower foundation in China, DL/T 5219-2005 “Technical Regulation for Foundation Design of Overhead Transmission Line” is under revision, of which the parameters A1 and A2 in shearing method of tower foundation uplift calculation are specially covered. Based on the analysis of three kinds of theoretical calculation models for typical foundation uplift at home and abroad, the unified calculation model and theoretical formula for the uplift bearing capacity of tower foundation are built, the unified theoretical formula of parameters A1 and A2 for shearing method of foundation uplift calculation at different soil failure plane morphology is presented, as well as the relationship between the values of A1 and A2 and soil failure plane morphology, internal friction angle, the ratio of uplift resistance depth to diameter of foundation slab is analyzed. The research results will provide references for the engineering design of tower foundation and the formulation or revision of relevant technical specifications.