Peng, D.; Bo, J.; Chang, C.; Li, X.; Duan, Y.; Qi, W. Study on The Geotechnical Property Changes of Loess after Seismic Landslides—A Case Study of The Subao Loess Landslide in Ningxia, China. Appl. Sci.2023, 13, 11023.
Peng, D.; Bo, J.; Chang, C.; Li, X.; Duan, Y.; Qi, W. Study on The Geotechnical Property Changes of Loess after Seismic Landslides—A Case Study of The Subao Loess Landslide in Ningxia, China. Appl. Sci. 2023, 13, 11023.
Peng, D.; Bo, J.; Chang, C.; Li, X.; Duan, Y.; Qi, W. Study on The Geotechnical Property Changes of Loess after Seismic Landslides—A Case Study of The Subao Loess Landslide in Ningxia, China. Appl. Sci.2023, 13, 11023.
Peng, D.; Bo, J.; Chang, C.; Li, X.; Duan, Y.; Qi, W. Study on The Geotechnical Property Changes of Loess after Seismic Landslides—A Case Study of The Subao Loess Landslide in Ningxia, China. Appl. Sci. 2023, 13, 11023.
Abstract
This study aims to explore the differences between loess and landslide deposits, focusing on as-pects such as particle distribution, consolidation characteristics, and dynamic shear modulus. Through a series of experiments, the research reveals the similarities and differences between these two entities, yielding several key findings. Firstly, the process of landsliding disrupts the original structure of the loess, resulting in a reduction in porosity and a densification of the soil. This alteration in structural properties leads to significant disparities in physical attributes be-tween landslide deposits and undisturbed loess. Additionally, the movement and sorting of par-ticles during landslides cause variations in particle size distribution across different sections of the landslide deposits. Secondly, the landslide process not only alters the soil's structure but also changes the particle sizes within the loess. Particle wear and sieving result in the transformation of larger particles into smaller ones, leading to a more uniform particle size distribution. This shift in structure and particle size directly impacts the consolidation characteristics of landslide deposits, resulting in a substantial reduction in compression coefficient. Despite undergoing consolidation for decades, the middle and lower sections of landslide deposits still exhibit un-der-consolidation. Although the differences in the maximum dynamic shear modulus between loess and landslide deposits at varying depths are relatively minor, differences in porosity and consolidation characteristics lead to faster decay rates of the dynamic shear modulus for the lat-ter. The study also highlights a reduction in the water sensitivity of the maximum dynamic shear modulus within landslide deposits. Based on experimental results, a predictive model is pro-posed, utilizing A and m values to estimate the maximum dynamic shear modulus of both loess and landslide deposits. In conclusion, this research uncovers the impact of landslide processes on the structure and properties of loess, providing insightful understanding into the disparities between these two entities.
Copyright:
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