地铁列车运营引起的既有线结构振动衰减规律分析

地铁列车运转产生的振动通过道床传到隧道结构,再通过土层向四周传播,诱发了附近地下结构以及地面建筑物的二次振动。通过对地铁列车运营引起的既有线结构振动在地层中的衰减规律测试,初步研究了既有地铁列车运营过程中的振动对施工和建成的部分初期结构的影响。

Study on the Weakening Rules of Vibration Caused by the Subway Train Operation in Existed Subway in Stratum Structure

As a result of subway train migration,the contacting of the wheel and the track has caused the track periodic vibration and the wheel has caused the impact vibration in track joint.These vibrations transmit to the tunnel structure through rail and bed,and then they are transmitted to periphery soil through tunnel structure,and finally further disseminates through the soil.All these induce the second vibration of the neighbor underground structure as well as ground building.Through the test to weakening rules of vibration of the already existed subway structure caused by the subway train operation in stratum,this article studies the influence of vibrations by the subway train operation process on the structures which are under construction or have already been completed.