Analysis of internal force and deformation of prefabricated underground station under the working condition of removing support
Taking a prefabricated underground station in Qingdao city as an example,a numerical simulation method is adopted to study the deformation and internal force variation trend of the envelope caused by the"replacing and removing support"condition in the assembly ring assembly process of the design scheme from the perspective of review,and the following conclusions are drawn:① The force calculation of the steel support according to the plane checking under the condition of removing the support is more general and insecure,and the design should consider the spatial influence range of the construction sequence;② The use of support intensify scheme can reduce the internal force of steel support as well as the enclosure wall deformation,but the intensify of 3 spans and the intensify of 1 span have basically the same impact on the deformation of the structure and the internal force.For the area with good geological conditions,the non-intensify scheme can be adopted as appropriate to improve the construction efficiency;③ The monitoring frequency should be strengthened during the process of building back of the assembly ring,especially after the removal of the support in a timely manner,the monitoring point should be arranged according to the position and spacing of the first concrete support;④ The fertilizer tank between the enclosure structure and the main structure should be backfilled in time according to the spacing of the first concrete support,which could effectively limit the development of lateral displacement of the enclosure wall.
metrofabricated stationinternal supporting systemconstruction periodfinite element analysisdeformation analysis
万方数据
维普
