长春地铁7号线列车运行对沿线某精密仪器场区的振动预测

拟修建的长春轨道交通7号线,下穿某精密仪器厂区(最小水平距离50 m,区间覆土为16.5 m),运营车辆对邻近内部压力机等精密仪器场区产生振动影响。通过测试分析长春轨道交通1、2号线相似断面的振动传播规律,预测了长春轨道交通7号线对沿线精密仪器场区的振动影响。结果表明:地质条件一致情况下,不同埋深条件下,行车振动加速度影响随着埋深增加而逐渐降低;敏感目标处的振动响应满足标准限值。

Prediction of Vibration of Precision Instruments on the Site of Changchun Metro Line 7

Changchun Rail Transit Line 7 is built under a precision instrument factory (minimum horizontal distance of 50 m; soil covering the section is 16.5 m deep). It is possible that the vibration of operating vehicles may affect precision instruments, such as factory presses. Accordingly, this study analyzes the vibration propagation law of similar sections of Changchun Rail Transit Line 1 and Line 2, and involves an analysis of the impact on precision instruments in the plant area along Changchun rail transit Line 7. The results show that: (1) Under the same geological conditions, the influence of vehicle vibration acceleration decreases with an increase in buried depth; (2) the prediction results show that the vibration response of the sensitive target meets the standard limit value. When analogy test prediction is used to predict environmental vibration impact, the reference of the analogy section should be fully considered, and an interpolation method is recommended for vibration prediction.