Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei Basin
Based on a large amount of drilling and geophysical exploration work in the Zhongwei Basin, and combined with the collected borehole data of a seismic safety assessment, this paper summarizes and builds 16 typical pebble soil layer calculation models. The effects of the thickness of the pebble layer...
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MDPI AG
2022-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/13/1/243 |
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| author | Shun Yang Xin Han Qiyun Lei Peng Du Chao Liu Zeshan Li |
| author_facet | Shun Yang Xin Han Qiyun Lei Peng Du Chao Liu Zeshan Li |
| author_sort | Shun Yang |
| collection | DOAJ |
| description | Based on a large amount of drilling and geophysical exploration work in the Zhongwei Basin, and combined with the collected borehole data of a seismic safety assessment, this paper summarizes and builds 16 typical pebble soil layer calculation models. The effects of the thickness of the pebble layer, the thickness of the overlying silty clay, the top interface of the pebble layer on the peak acceleration and the response spectrum of the site seismic response were analyzed using the equivalent linearization method of the one-dimensional soil layer seismic response. The analysis results showed that the variation in pebble layer thickness had no obvious effect on the peak acceleration of the ground surface under different inputs; the influence of the pebble layer thickness on the ground acceleration response spectrum was primarily concentrated in the middle/high-frequency band of 0.2–0.6 s. Within this range, the acceleration response spectrum of the site with a 30 m pebble layer thickness was small, and the response spectrum curve showed a “trough” shape with a certain “weak isolation” effect. Under the same pebble layer thickness, the upper ground surface peak acceleration with a silty clay layer thickness increased with the increase in the central basin pebble soil field, where a short cycle of the seismic wave amplification effect was more obvious. The response spectrum peak period points were within 0.1–0.2 s and were influenced by the action of rare earthquakes. Moreover, the response spectrum curve showed a more obvious phenomenon of “twin peaks”, and the second peak point appeared in the period of 0.5–0.7 s. With the increase in the input intensity, the PGA amplification ratio of the pebble-top interface was significantly smaller than that of the site surface; under different intensities of input, the acceleration response spectrum of the pebble-top interface showed a “trough” phenomenon that was lower than the bedrock input at approximately 0.1 s. Under the action of rare ground motion, the acceleration response spectrum curve of the pebble-top interface showed a “double peak” phenomenon, and within 0.24–0.4 s, the spectrum value was lower than the bedrock input, showing an obvious shock absorption and isolation effect. Under the action of an earthquake, the energy of the pebble-top interface was concentrated in the low-frequency range of 1.1–2.2 Hz, and the amplification effect was obvious. In the range of 8–10 Hz, the amplitude was lower than the bedrock input, and the seismic isolation effect was obvious. |
| first_indexed | 2024-03-11T10:08:44Z |
| format | Article |
| id | doaj.art-4a14ce48e20e48e49249f39ed52ebbbb |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-11T10:08:44Z |
| publishDate | 2022-12-01 |
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| spelling | doaj.art-4a14ce48e20e48e49249f39ed52ebbbb2023-11-16T14:52:39ZengMDPI AGApplied Sciences2076-34172022-12-0113124310.3390/app13010243Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei BasinShun Yang0Xin Han1Qiyun Lei2Peng Du3Chao Liu4Zeshan Li5Earthquake Agency of Ningxia Hui Autonomous Region, Yinchuan 750001, ChinaEarthquake Agency of Gansu Province, Lanzhou 730000, ChinaEarthquake Agency of Ningxia Hui Autonomous Region, Yinchuan 750001, ChinaEarthquake Agency of Ningxia Hui Autonomous Region, Yinchuan 750001, ChinaEarthquake Agency of Ningxia Hui Autonomous Region, Yinchuan 750001, ChinaEarthquake Agency of Ningxia Hui Autonomous Region, Yinchuan 750001, ChinaBased on a large amount of drilling and geophysical exploration work in the Zhongwei Basin, and combined with the collected borehole data of a seismic safety assessment, this paper summarizes and builds 16 typical pebble soil layer calculation models. The effects of the thickness of the pebble layer, the thickness of the overlying silty clay, the top interface of the pebble layer on the peak acceleration and the response spectrum of the site seismic response were analyzed using the equivalent linearization method of the one-dimensional soil layer seismic response. The analysis results showed that the variation in pebble layer thickness had no obvious effect on the peak acceleration of the ground surface under different inputs; the influence of the pebble layer thickness on the ground acceleration response spectrum was primarily concentrated in the middle/high-frequency band of 0.2–0.6 s. Within this range, the acceleration response spectrum of the site with a 30 m pebble layer thickness was small, and the response spectrum curve showed a “trough” shape with a certain “weak isolation” effect. Under the same pebble layer thickness, the upper ground surface peak acceleration with a silty clay layer thickness increased with the increase in the central basin pebble soil field, where a short cycle of the seismic wave amplification effect was more obvious. The response spectrum peak period points were within 0.1–0.2 s and were influenced by the action of rare earthquakes. Moreover, the response spectrum curve showed a more obvious phenomenon of “twin peaks”, and the second peak point appeared in the period of 0.5–0.7 s. With the increase in the input intensity, the PGA amplification ratio of the pebble-top interface was significantly smaller than that of the site surface; under different intensities of input, the acceleration response spectrum of the pebble-top interface showed a “trough” phenomenon that was lower than the bedrock input at approximately 0.1 s. Under the action of rare ground motion, the acceleration response spectrum curve of the pebble-top interface showed a “double peak” phenomenon, and within 0.24–0.4 s, the spectrum value was lower than the bedrock input, showing an obvious shock absorption and isolation effect. Under the action of an earthquake, the energy of the pebble-top interface was concentrated in the low-frequency range of 1.1–2.2 Hz, and the amplification effect was obvious. In the range of 8–10 Hz, the amplitude was lower than the bedrock input, and the seismic isolation effect was obvious.https://www.mdpi.com/2076-3417/13/1/243pebble soil siteseismic effectpeak ground accelerationacceleration response spectrumexcellent frequencyequivalent linearization method |
| spellingShingle | Shun Yang Xin Han Qiyun Lei Peng Du Chao Liu Zeshan Li Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei Basin Applied Sciences pebble soil site seismic effect peak ground acceleration acceleration response spectrum excellent frequency equivalent linearization method |
| title | Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei Basin |
| title_full | Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei Basin |
| title_fullStr | Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei Basin |
| title_full_unstemmed | Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei Basin |
| title_short | Study on the Seismic Effect of the Pebble Soil Site in the Zhongwei Basin |
| title_sort | study on the seismic effect of the pebble soil site in the zhongwei basin |
| topic | pebble soil site seismic effect peak ground acceleration acceleration response spectrum excellent frequency equivalent linearization method |
| url | https://www.mdpi.com/2076-3417/13/1/243 |
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