CAJ | 학술논문

为确定京津城际铁路地震预警系统地震仪的触动阀值,在高速列车通过时,对京津城际铁路桥墩基础场地进行了振动测试,并采用最小二乘法及频谱分析获得了桥墩附近场地的振动加速度衰减规律及其频率特性.结果表明,振动加速度幅值在距离桥墩10 m范围内衰减很快,且垂直向衰减比水平向快,超过10 m范围后,衰减变缓,水平向与垂直向的振动幅值衰减接近;在桥墩附近,加速度水平向及垂直向主振频率分别为37 Hz和41 Hz,远高于理论预测值;距桥墩70 m处安置的地震仪不会被触发.
위학정경진성제철로지진예경계통지진의적촉동벌치,재고속열차통과시,대경진성제철로교돈기출장지진행료진동측시,병채용최소이승법급빈보분석획득료교돈부근장지적진동가속도쇠감규률급기빈솔특성.결과표명,진동가속도폭치재거리교돈10 m범위내쇠감흔쾌,차수직향쇠감비수평향쾌,초과10 m범위후,쇠감변완,수평향여수직향적진동폭치쇠감접근;재교돈부근,가속도수평향급수직향주진빈솔분별위37 Hz화41 Hz,원고우이론예측치;거교돈70 m처안치적지진의불회피촉발.
To confirm the triggered threshold value of a seismograph of the earthquake warning system of Beijing-Tianjin railway, the ground vibrations of pier foundations induced by a high-speed train were tested. The acceleration at-tenuation law and frequency characteristics were obtained by frequency spectrum analysis and the method of least squares.The results showed that amplitudes of acceleration rapidly decrease and the vertical one more rapidly decrease than the horizontal ones within 10 meters from a pier, but slowly decrease in the distance range of above 10 meters, and vertical and horizontal attenuation are similar; the main frequency in the horizontal direction is 37Hz, and the one in the vertical direction is 41Hz, much higher than the predictions by theory, and the seismograph can not be triggered at the distance of 70 meters from a pier.