【摘要】 文章以某管廊工作井施工为例，采用PLAXIS3D软件建立三维模型，进行数值分析，研究顶管工作井施工中十二个工况对既有铁塔基础的影响，在顶管工作井施工过程中，对邻近输电塔影响最大的步骤为基坑内外土体加固阶段。评估该工程引起的既有工程风险等级，可为既有工程安全评定提供参考。更多还原

【Abstract】 Taking the construction of a pipe gallery working well as an example, this paper uses PLAXIS 3D software to establish a three-dimensional model for numerical analysis, and studies the influence of twelve kinds of working conditions on the existing iron tower foundation in the construction of pipe jacking working well. In the construction process of pipe jacking working well, the step that has the greatest influence on the adjacent power transmission tower is the soil reinforcement stage inside and outside the foundation pit. Assessing the existing engineering risk level caused by the engineering can provide reference for the safety assessment of the existing engineering.更多还原