预测北京地铁16号线振动对北京大学精密仪器的影响  

Prediction of the influence of the proposed Beijing metro line 16 on a precise instrument of Peking University

作　　者：耿万里[1] 刘敦宇 蔡永恩[1] 张琼[1] 雷军[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《地震工程与工程振动》2014年第6期19-25,共7页Earthquake Engineering and Engineering Dynamics

摘　　要：本文提出了模拟地铁环境振动的浮置板-隧道-地层三维有限元模型,振动源为实际观测的地铁钢轨振动加速度。本文旨在研究拟建的北京地铁16号线对200 m远处的北京大学场效应电子显微镜Tecnai F30（以下简称F30）工作可能造成的影响。为此,首先模拟了运营中的北京地铁4号线通过北京大学东门站对F30的影响,然后以与16号线相同车型、相同轨道半径的上海地铁7号线实测钢轨振动加速度作为振动源输入,模拟和预测了16号线地铁对F30工作可能造成的影响。结果表明：4号线模拟结果显示在140 m观测点无论单线还是双线运行,都有部分频段（3~5 Hz）进入F30的非工作区,而16号线在200 m远处仅是横向加速度在0~0.8 Hz和4~6 Hz范围进入非正常工作区,垂向加速度在5~6 Hz范围内进入非正常工作区。In this paper, using observed accelerations from the rails of Beijing metro as vibration sources, we build a three-dimensional metro model containing floating slab-tunnel-formation system to study the influence of the sur- face vibration caused by the proposed Beijing subway line 16 on a high precision electron microscope, Tecnai F30 （hereinafter referred to as the F30）, of Peking University, which is about 200m from the rail alignment. To do this, firstly, we simulate the vibration of Beijing metro line 4 passing through the east gate of Peking University sta- tion and its influence on the F30, and then the acceleration measurements of the Shanghai metro line 7 is selected as vibration source for the proposed Beijing subway line 16 model in consideration of that they have the same orbit radius of rail and the same vehicle model. The results show that ： the simulation results of the metro line 4 show that at 140 m observation point, no matter single or double operation, there are part of the spectrum （3 -5 Hz） to get into the F30 non-working range, and for the 16 line at the distance of 200 m, there is only part of the spectrum get- ting into the abnormal-working range ： the horizontal acceleration at 0 - 0.8 Hz and 4 -6 Hz and the vertical accel- eration at 5 -6 Hz are in the abnormal-working range of the F30, respectively.

关 键 词：地铁振动 精密仪器 加速度响应 有限元模拟 振动预测 

分 类 号：TB533.2[理学—物理] X503.5[理学—声学]