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对北京地铁某车站明挖基坑施工跟踪监测,及时掌握基坑变形、支撑内力的变化动态,分析了施工过程中支护结构位移与内力的变化特征,并指导施工确保基坑稳定。测试表明：a)围护结构水平位移随工期的延续而增加,基坑开挖完成后逐渐趋于稳定,位移在第2道支撑处最大,围护结构底部位移较小；b)第1道钢支撑的轴力明显大于第2道和第3道支撑的轴力,c)在基坑阳角处斜钢支撑的轴力比其他位置钢支撑的轴力要大得多。
The tracking and monitoring of the excavation foundation pit excavation in a station of Beijing subway grasped the dynamic changes of the deformation and support internal forces of foundation pit in time and analyzed the characteristics of the displacement and internal forces of the support structure during the construction and guided the construction to ensure the stability of the foundation pit. The tests show that: a) The horizontal displacement of the retaining structure increases with the duration of the project; the excavation of the foundation pit gradually becomes stable after the completion of excavation; the displacement is largest at the support of the second lane and the displacement of the bottom of the retaining structure is small; b) The axial force of the steel support is significantly greater than the axial forces of the support of the second and third lanes. C) The axial force of the steel support at the base of the foundation pit is much greater than the axial force of the steel support at other locations.