LIU Kun,LU Yuxia,XU Shunhua.Study on Characteristics of Dynamic Response at Digging⁃filling Sites in the Loess Hilly and Gully Region[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):1096-1104.
LIU Kun,LU Yuxia,XU Shunhua.Study on Characteristics of Dynamic Response at Digging⁃filling Sites in the Loess Hilly and Gully Region[J].Journal of Disaster Prevention and Mitigation Engineering,2021,41(05):1096-1104. DOI: 10.13409/j.cnki.jdpme.201908017.
Study on Characteristics of Dynamic Response at Digging⁃filling Sites in the Loess Hilly and Gully Region
Based on the large-scale reclamation project by digging hill and filling gully in the loess hilly and gully region, combined with relevant engineering examples, the dynamic response characteristics and key influencing factors of the new digging-filling sites under earthquake action are quantitatively analyzed. Considering site geophysical survey and dynamic triaxial tests of compacted loess, a site seismic response analysis model for lateral heterogeneity is constructed. The influence of site filling thickness, digging-filling interface and loess mechanical parameters on ground motion characteristic parameters in the digging, filling, and transition areas is given. It is found that: the overburden thickness of loess has a significant effect on the peak acceleration of ground motion in a certain range, while the overburden thickness beyond a given height has a restraint effect on seismic waves; the compaction parameters of the filling layer affect the range of ground motion amplification in the filling area; the average slope of the digging-filling interface and the interface impedance affect refraction and reflection of the seismic waves fields in plane. The research results can provide a reference for seismic stability analysis of large-scale digging-filling sites in the loess region and have certain practical significance.
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