【摘要】 为研究地铁列车引起的地面振动的规律,选择在北京地铁东单—建国门区间,采用高灵敏度加速度传感器和24位动态信号采集记录系统,测试正常运营的地铁及地面交通造成的地面垂向振动加速度。采用汉宁窗和线性平均技术,将95次测试记录共354个时程信号转换为频域内的1/3倍频程频谱;按照地铁的车型进行平均化处理,得到地铁G型车和S型车的1/3倍频程谱均值。分析结果表明,影响地铁列车引起的地面振动规律的因素主要有距离和背景振动。地面振动存在1个"交汇频率",在小于"交汇频率"的范围内,地铁列车引起的地面振动主要受背景振动制约,而距离的影响很微弱;在大于"交汇频率"的范围内,地铁列车引起的地面振动主要受距离的影响,但背景振动的作用仅次于距离。地铁与地面车辆引起的地面振动的叠加,使在1~30 Hz频率段内的地面振动响应增大。更多还原

【Abstract】 In-situ tests of metro induced ground vibrations were carried out at Dongdan-Jianguomen interval in Beijing,in order to study the law of metro induced ground vibrations.Vertical ground vibrations induced by the normal operation of metro and ground traffic were tested using a high sensitive acceleration sensor and 24-bit dynamic signal collection system.All 95 records of 354 times histories were transformed into 1/3 octave band frequency spectrum through Hanning window and linear average technology.The frequency domain data were averaged according to metro style,thereby obtaining the averaged 1/3 octave band frequency spectrum of both G style metro and S style metro.Analysis results show that the main factors influencing metro induced ground vibrations are distance and background vibration.There exists a "joining frequency" for ground vibrations.When smaller than the "joining frequency",metro induced ground vibrations are mainly dominated by background vibration,while effect of distance is very weak.When bigger than the "joining frequency",they are mainly dominated by distance,but the effect of background vibration is only inferior to the distance.Superposition of metro induced ground vibrations and ground traffic causes the response within 1—30 Hz to increase.更多还原