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Evolution process and failure mechanism of a large expressway roadside landslide
Jian Zhang1, Shihua Zhang2, Yong Ding3
1School of Civil and Environmental Engineering, Ningbo University, Ningbo, 315211, China. ddn029@163.com.
This study details a large expressway landslide, showing initial failure at the slope toe and progressive development. Controlling rainwater runoff is key to mitigating similar landslide risks.
Area of Science:
- Geotechnical Engineering
- Earthquake Engineering
- Geology
Background:
- Expressway roadside slopes are susceptible to landslides, posing significant risks to infrastructure and safety.
- Understanding the dynamic evolution of landslides during initial sliding is crucial for effective risk management.
Purpose of the Study:
- To analyze the detailed evolution process of a large expressway roadside landslide during its initiation.
- To investigate the influence of extreme rainfall on slope stability and support structures.
Main Methods:
- Field site investigation and deformation monitoring.
- Laboratory testing of soil properties.
- Theoretical calculations and analysis of landslide mechanics.
Main Results:
- Initial failure initiated at the protective wall of the slope toe, progressing upwards to the slope's trailing edge.
- Extreme rainfall accelerated deformation in slope support systems, including protective walls, anti-slide piles, and anchor cables.
- Infiltrating rainwater altered soil weight, osmotic pressure, and forces, reducing soil strength and triggering the landslide.
Conclusions:
- Blocking slope surface runoff is an effective strategy for reducing landslide risk.
- The findings provide valuable insights for the prevention, control, and emergency response to similar landslides.
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