双肢高墩施工过程中的稳定性问题不容忽视，为保证现场施工安全，以郑洛高速庙路河大桥为工程依托，建立了双肢高墩裸墩、大悬臂和成桥3个施工阶段的有限元模型，研究了双肢高墩稳定性；得到了双肢高墩的屈曲模态和稳定安全系数，并对最不利施工阶段进行非线性稳定性分析；探析了实际施工过程中的高墩线形偏差、墩身孔洞缺陷、桥墩高度和横梁数目等稳定性影响因素。结果表明：3个施工阶段下，双肢高墩均为纵桥向失稳，最不利工况下的稳定安全系数分别为70.092、33.513和55.034。对大悬臂阶段进行几何非线性和双重非线性分析，稳定性分别较线性分析时降低了15%和57%。双肢高墩爬模施工过程中出现的线形偏差和墩身孔洞对稳定性有一定的影响，应对线形偏差值进行监测和控制，并及时修复墩身孔洞。随着桥墩高度的增加稳定性不断降低，双肢之间设置一道横梁时稳定性提高140%，继续增加横梁数目稳定性提高不大，墩高在50 ~ 70 m范围内时设置一道横梁效益最优。

The stability of double-limb high pier cannot be ignored in the process of construction. In order to ensure the safety of construction, finite element models were established for three construction stages: bare high pier, large cantilever, and completed bridge to study the stability of double-limb high pier, based on the Miaoluhe bridge of Zhengzhou-Luoyang Expressway. The buckling modes and stability coefficient of double-limb high pier were obtained, and the nonlinear stability analysis of the most unfavorable construction stage was carried out. Finally, the influencing factors on stability such as the alignment deviation, the hole defects, the pier height and the number of crossbeams were analyzed. The results show that under the three construction stages, the double-limb high pier are longitudinal instability, and the stability coefficient of the most unfavorable conditions are 70.092, 33.513, and 55.034. After considering geometric nonlinearity and geometric and material double nonlinearity, the stability of the large cantilever stage has decreased by 15% and 57%, compared to linear analysis. The alignment deviation and the hole defects occurring in the climbing formwork construction of double-limb high piers have an impact on the stability. Therefore, it is necessary to control alignment deviations and repair holes in time. As the height of the pier increases, stability decreases continuously. When one crossbeam is installed between the two limbs, stability improves by 140%. However, further increasing the number of crossbeams does not significantly improve stability. Therefore setting one crossbeam within the range of 50 ~ 70 m pier height is the best.