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海南东环铁路美兰机场明挖隧道基坑,采用锚索与钢支撑混合支撑的方案。给出了基坑围护和变形监测方案,对该基坑施工跟踪监测,掌握支撑内力、基坑变形的变化动态,分析了施工过程中支护结构位移与内力的变化特征,测试表明:①锚索轴力在基坑开挖时变化较大,基坑开挖完成后逐渐趋于稳定;②钢支撑架设后,监测到的轴力有不断增加的趋势,监测值有小的跳动,但最终趋于稳定;③桩体水平位移随基坑的深度逐渐减小,在基坑顶部位移最大,基坑底部位移趋于零。
Hainan Donghuan Railway Meilan Airport Ming tunnel excavation, the use of anchor cable and steel support mixed support program. Based on the analysis of the variation of displacement and internal force during the construction process, the test shows that: ① The axial force of anchor cable changes greatly during the excavation of the foundation pit, and gradually stabilizes after excavation of the foundation pit. ② After the steel support is erected, the monitored axial force tends to increase constantly and the monitoring value has a small beat. However, And finally tends to be stable. (3) The horizontal displacement of piles decreases with the depth of the foundation pit, and the displacement at the top of the foundation pits is the largest. The displacement at the bottom of the foundation pit tends to zero.