Based on the cut-and-cover excavated section in the project of Chongqing rail transit circle line between Yulu Station and Wulidian Station ,the article uses the finite element software ANSYS to set up a three -dimensional model to calculate and analyze the influence of different excavation footages on adjacent piers and under cross culvert . The results indicate that the influence of small excavation footage on adjacent piers and under - cross culvert's displacement and strain is smaller than that of large excavation footage ,which is more beneficial for controlling the deformation of adjacent structures .Through the results of calculation and analysis ,the article proposes that small excavation footage can be used as one of the measures for controlling deformation of adjacent structures in the process of the practical construction .%以重庆轨道环线渝鲁车站至五里店车站区间明挖段工程为背景，采用有限元软件ANSYS建立三维模型计算分析了不同开挖进尺对邻近桥墩及下跨拱涵的影响特性。分析结果表明：小进尺开挖对邻近桥墩及下跨拱涵的位移、应变影响较大进尺开挖小，更有利于控制邻近建筑物的变形。利用此计算分析结果，小进尺开挖可作为实际施工过程中控制邻近建筑物变形的措施之一。
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