Seismic Wave Propagation Characteristics and Their Effects on the Dynamic Response of Layered Rock Sites
To investigate the seismic response of layered rock sites, a multidomain analysis method was proposed. Three finite element models with infinite element boundaries for layered sites were analysed. The results of this multidomain analysis show that stratum properties and elevation have an impact on w...
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MDPI AG
2022-01-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/2/758 |
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| author | Lihu Dong Danqing Song Guangwei Liu |
| author_facet | Lihu Dong Danqing Song Guangwei Liu |
| author_sort | Lihu Dong |
| collection | DOAJ |
| description | To investigate the seismic response of layered rock sites, a multidomain analysis method was proposed. Three finite element models with infinite element boundaries for layered sites were analysed. The results of this multidomain analysis show that stratum properties and elevation have an impact on wave propagation characteristics and the dynamic response of layered sites. Compared with the rock mass, the overlying gravel soil has a greater dynamic amplification effect at the sites. A time domain analysis parameter PGA<sub>(IMF)</sub> was proposed to analyse the effects of different strata on the seismic magnification effect of layered sites, and its application was also discussed in comparison with PGA. According to the frequency domain analysis, the interface of the rock mass strata has a low impact on the Fourier spectrum characteristics of the sites, but gravel soil has a great magnification effect on the spectrum amplitude in the high-frequency band (≥30 Hz) of waves. Moreover, the stratum properties have a great influence on the shape and peak value of the Hilbert energy and marginal spectrum at layered sites. When waves propagate from hard rock to soft rock, the peak value of the Hilbert energy spectrum changes from single to multiple peaks; then, in gravelly soil, the Hilbert energy spectral peak, its nearby amplitude and the amplitude in the high-frequency band (28–36 Hz) are obviously amplified. The frequency components and amplitude of the marginal spectrum become more abundant and larger from rock to gravelly soil in the high-frequency band (28–35 Hz). |
| first_indexed | 2024-03-10T01:58:43Z |
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| id | doaj.art-466f8bdfced24e26b641e23c58c37b5d |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T01:58:43Z |
| publishDate | 2022-01-01 |
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| spelling | doaj.art-466f8bdfced24e26b641e23c58c37b5d2023-11-23T12:52:22ZengMDPI AGApplied Sciences2076-34172022-01-0112275810.3390/app12020758Seismic Wave Propagation Characteristics and Their Effects on the Dynamic Response of Layered Rock SitesLihu Dong0Danqing Song1Guangwei Liu2School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, ChinaState Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, ChinaCollege of Mining Engineering, Liaoning Technical University, Fuxin 123000, ChinaTo investigate the seismic response of layered rock sites, a multidomain analysis method was proposed. Three finite element models with infinite element boundaries for layered sites were analysed. The results of this multidomain analysis show that stratum properties and elevation have an impact on wave propagation characteristics and the dynamic response of layered sites. Compared with the rock mass, the overlying gravel soil has a greater dynamic amplification effect at the sites. A time domain analysis parameter PGA<sub>(IMF)</sub> was proposed to analyse the effects of different strata on the seismic magnification effect of layered sites, and its application was also discussed in comparison with PGA. According to the frequency domain analysis, the interface of the rock mass strata has a low impact on the Fourier spectrum characteristics of the sites, but gravel soil has a great magnification effect on the spectrum amplitude in the high-frequency band (≥30 Hz) of waves. Moreover, the stratum properties have a great influence on the shape and peak value of the Hilbert energy and marginal spectrum at layered sites. When waves propagate from hard rock to soft rock, the peak value of the Hilbert energy spectrum changes from single to multiple peaks; then, in gravelly soil, the Hilbert energy spectral peak, its nearby amplitude and the amplitude in the high-frequency band (28–36 Hz) are obviously amplified. The frequency components and amplitude of the marginal spectrum become more abundant and larger from rock to gravelly soil in the high-frequency band (28–35 Hz).https://www.mdpi.com/2076-3417/12/2/758dynamic responselayered sitesspectral characteristicsmultidomain analysisseismic excitation |
| spellingShingle | Lihu Dong Danqing Song Guangwei Liu Seismic Wave Propagation Characteristics and Their Effects on the Dynamic Response of Layered Rock Sites Applied Sciences dynamic response layered sites spectral characteristics multidomain analysis seismic excitation |
| title | Seismic Wave Propagation Characteristics and Their Effects on the Dynamic Response of Layered Rock Sites |
| title_full | Seismic Wave Propagation Characteristics and Their Effects on the Dynamic Response of Layered Rock Sites |
| title_fullStr | Seismic Wave Propagation Characteristics and Their Effects on the Dynamic Response of Layered Rock Sites |
| title_full_unstemmed | Seismic Wave Propagation Characteristics and Their Effects on the Dynamic Response of Layered Rock Sites |
| title_short | Seismic Wave Propagation Characteristics and Their Effects on the Dynamic Response of Layered Rock Sites |
| title_sort | seismic wave propagation characteristics and their effects on the dynamic response of layered rock sites |
| topic | dynamic response layered sites spectral characteristics multidomain analysis seismic excitation |
| url | https://www.mdpi.com/2076-3417/12/2/758 |
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