Abstract
The objective of this research is to analyze the dynamic degeneration of loess and the evaluation method of field seismic subsidence. In this study, Q3 loess is taken as the research object, and the dynamic properties of loess with 10%, 20%, 30% and 35% moisture content are tested by triaxial experiment. In addition, seismic subsidence characteristics of loess with dry densities of 1.4g/cm3, 1.6g/cm3, and 1.8g/cm3 and consolidation stress ratios of 1.0, 1.2, 1.4, and 1.6 are analyzed. Then the simplified seismic subsidence estimation method is used to calculate the relationship between seismic subsidence coefficients at different soil depth in one dimensional field, cycle times, and subsidence depth. The results show that the higher the water content of loess is, the greater the change of seismic subsidence appears. The larger the dry density of loess is, the smaller the change degree of seismic subsidence appears. The larger the consolidation stress ratio is, the greater the change of seismic subsidence occurs in loess. When the depth of soil reaches 9.5m, the maximum seismic subsidence coefficient can reach 0.8%. When the depth of soil layer is 10m, the degree of seismic subsidence is the largest. When the depth of soil layer is 12~16m, the settlement depth caused by earthquake subsidence is small. While the depth of soil layer is 8~12m, the settlement degree is large.
Highlights
Loess is a kind of soil with weak cementation, large pore size, and easy denaturation when encountering water (Qiu et al, 2018)
This study aims to provide theoretical basis for the subsequent analysis of loess seismic subsidence characteristics and field earthquakes
Based on the previous research results, the seismic subsidence characteristics of the original loess with different moisture content, density, and consolidation stress are analyzed by triaxial experiment
Summary
Loess is a kind of soil with weak cementation, large pore size, and easy denaturation when encountering water (Qiu et al, 2018). Under the action of water and dynamic load, serious geological disasters such as collapsibility and seismic subsidence would occur (Hao et al, 2018). The subsidence of soil under the action of earthquake is seismic subsidence. Due to its unique dynamic characteristics, loess is usually damaged when strong earthquakes occur (Cheng et al, 2018). The specific physical properties of loess, such as dry density and water content, have a great impact on the dynamic characteristics of loess and play an important role in the study of the characteristics of loess (Liu et al, 2017). The soil would subside under the action of dynamic load, and some soil with high water content would collapse due to vibration (Chen et al, 2017). Dry density is an important internal factor that reflects the seismic subsidence degeneration of loess
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