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| Study on spectrum characteristics of dynamic earth pressure of loess landslides based on wavelet transform |
| SHI Yanqiu1，XIE Xianlong2，3，ZHANG Qikai4，JIANG Han3，PENG Jiajun3，LIAO Xin3 |
| (1. College of Railway Engineering，Jilin Railway Technology College，Jilin，Jilin 132200，China；2. China Railway Siyuan Survey and Design Group Co.，Ltd.，Wuhan，Hubei 430063，China；3. Faculty of Geosciences and Environmental Engineering，Southwest Jiaotong University，Chengdu，Sichuan 611756，China；4. Zhejiang Engineering Survey and Design Institute Group Co.，Ltd.，Ningbo，Zhejiang 315012，China) |
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Abstract In order to investigate the response spectrum characteristics of the dynamic soil pressure along the elevation and sliding surface of loess slopes under the action of earthquake，large-scale shaking table experiments were performed by progressively loading X-direction and Z-direction seismic waves until failure of the slope. The dynamic soil pressure curves of 5 sensors along the elevation and near the sliding surface were obtained，and the time-domain curve of the dynamic soil pressure was decomposed by using wavelet transform. The results show that，in the process of step loading through inputting EL-Centro wave，the response of the dynamic soil pressure at each measurement point is significant，and that the peak value of the dynamic soil pressure is increasing under the action of the inertial force while the dynamic soil pressure is decreasing along the elevation. The soil pressure is increasing from the foot to the inside of the slope along the sliding surface，The slope of the straight line between the measuring points S–1 and S–3 is greater than that between the measuring points S–3 and S–5，indicating that，in the loading process，the front of the landslide maintains compaction state while the S–5 point in the rear is more likely to be disturbed. The low-frequency seismic stress wave of the wavelet components of the first frequency band(0.1 to 6.26 Hz) and the second frequency band(6.26 to 12.51 Hz) has the most significant effect on the dynamic earth pressure，playing a leading role in the response of the earth pressure. The dynamic earth pressure curves under the first and second frequency bands of each channel are similar to the measured curves，while them are quite different from each other under the third and eighth frequency bands. The low-frequency wave plays a dominant role in the response to the soil pressure，and the loess slope has a "filtering effect" on the high-frequency part of the seismic wave moving along the elevation.
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2020, Vol. 39 
