Research On Vibration Of Nearby Museum Induced By Chengdu Metro Line 2

With the rapid development of national economy and the acceleration of urbanization, the city ground traffic density growing larger, in addition, the development of ground space has relatively tend to be saturated, therefore, as a transportation form by using underground space, urban subway traffic will greatly relieve urban traffic pressure, promote urban transportation efficiency and economic development. However, the subway traffic construction is in the ascendant, at the same time many problems such as vibration and noise generated by the subway train operation have been increasingly prominent. The paper sets Chengdu metro line 2 which is constructing as the main research object, studies on vibration that is caused by metro line 2 will influence on the museum which is planed nearby when line 2 is built and operated. Through the analysis and research, steel spring floating slab track and vibration isolate ditch are confirmed as isolation measures, which can effectively reduce vibration influence. The main research contents are as follows:1. Vibration control standards of museum building are confirmed by Reading and studying on domestic and oversea vibration control standards about construction.2. Experiments for ground vibration propagation on the museum construction site and vibration propagation between ground and tunnel were done. Incentive loads were generated by force hammers, propagation law of different frequency vibration wave on the ground and vertical propagation law of different frequency vibration wave between ground and tunnel were researched by measuring vibration acceleration. Meanwhile, parameters for correcting the later numerical model were provided.3. This paper adopted finite element software ANSYS to build a three-dimensional unified finite element model for building-surrounding soils-tunnel (steel spring floating slab was used in track structure). The museum vibration acceleration features in the frequency domain and time domain are studied. Vibration reduction efficiency of isolation measures and relevant limits of vibration acceleration does not exceed vibration control standards are tested and verified.