列车振动循环荷载作用下软黏土响应特性室内试验研究

Laboratory Research on Soft Clay Response Characteristics Under Vibration and Cyclic Load

采用动三轴试验分析不同动应力比和频率对土动强度的影响。根据现场实测结果,确定了地铁列车驶过时引起的隧道周围土体的响应频率分布区域,结合设备的循环加载能力,确定动三轴试验的加载频率为0.5Hz和2Hz。

The effects of different dynamic stress ratios and frequencies on soil dynamic strength were analyzed by dynamic triaxial test.According to the field measurement results, the response frequency distribution region of the soil around the tunnel caused by the passing of subway trains is determined. Combined with the cyclic loading capacity of the equipment, the loading frequencies of the dynamic triaxial test were determined to be 0.5 Hz and 2 Hz.