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以南水北调工程盾构施工穿越北京地铁13号线清河桥工程为背景,采用有限元分析方法,针对不同施工加固措施及行车速度条件下所引起的桥面竖向变形、桥墩竖向变形和地表沉降等问题进行了研究。总结了预加固旋喷桩配比参数、注浆配比参数及行车速度等因素对各结构变形的影响程度。结果表明:水灰比为1.00时的旋喷桩,既能控制结构变形,又具有较高的经济和施工效益;水泥浆与水玻璃浆之比为1.0∶1.0时的注浆参数最优;行车速度控制在50 km/h以下时,能较好地控制结构变形的发展。最后通过对施工过程中各结构的变形进行监测,验证了优化结果的合理性。
Based on the construction of Qinghe Bridge of Beijing Metro Line 13 on the shield tunnel construction of South-to-North Water Diversion Project, the vertical deformation of bridge deck, vertical deformation of bridge pier and surface subsidence caused by different construction reinforcement measures and driving speed are analyzed by finite element analysis And other issues were studied. The influence degree of pre-reinforced rotary-jetting pile’s matching parameters, grouting ratio parameters and driving speed on the deformation of each structure is summarized. The results show that the grouting parameters with water - cement ratio of 1.00 are the best, which can not only control the structural deformation but also have high economic and construction benefits. When the driving speed is under 50 km / h, the deformation of the structure can be controlled well. Finally, the deformation of each structure during the construction process is monitored to verify the rationality of the optimization results.