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Research On Micro-tremor Characteristics And Dynamic Response Of Loess Slope In Baoji

Posted on:2011-12-09Degree:MasterType:Thesis
Country:ChinaCandidate:J X TianFull Text:PDF
GTID:2120360302992610Subject:Geological Engineering
Abstract/Summary:PDF Full Text Request
In recent years, the world enters the earthquake-prone period, but as far as we know that so few earthquakes are predicted accurately. According to field surveys, the field vibration effect caused by earthquake is a key factor leading to disaster, which can trigger the resonance effect that causes structural damage. The occurrence probability of damage and the scale of destruction mainly depend on the self-vibration cycle of the site. The microtremor signal includes layer structure formation in propagation process, so we could get the predominant period of the site by microtremor tests and provide a reference for anti-earthquake design of buildings to minimize earthquake hazards.According to seismic zoning, Baoji City, Shanxi Province locates on the Shanxi earthquake sub-area and Ningxia-Longmen Mountain earthquake sub-area, Weihe and Xihaigu seismic belt. In view of the seismic and landforms features of Baoji City, it is necessary to carry out the study on the stability of loess slope under earthquake.Based on the analysis on the spectral data obtained by the 10 test lines set up around Baoji City, we know that the site predominant period is largely related to the micro-topographic structure of the site. The higher the terrain and the thicker the coverage layer, the longer the of the site is, so we could get a conclusion that the high slope has a significant amplification effect on the earthquake.Because of the economic, space and other objective conditions, we could only get the predominant period of the site where the test points locate, but the dynamic response rules of the whole site is unknown. Fortunately this problem can be effectively solved by the numerical simulation method. By the application of the FLAC3D numerical simulation software, one typical loess slope's dynamic response rules is revealed. We hope we could provide a reference value for the anti-earthquake design of this region.
Keywords/Search Tags:Microtremor, predominant period, micro-topography, FLAC3D, numerical simulation
PDF Full Text Request
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