On December 18, 2023, a magnitude MS6.2 earthquake shook Jishishan County in Gansu Province, China, leading to significant geological disruptions and economic setbacks. The quake, which resulted in over 40 sites of seismic subsidence within a zone of seismic intensity VI, has raised alarm bells in the construction sector, especially among operators of mountain photovoltaic power stations that suffered tens of millions in losses.
In response to this disaster, a team of researchers led by Yali Wang from the Lanzhou Institute of Seismology, part of the China Earthquake Administration, has undertaken a comprehensive study to understand the mechanics behind the seismic-collapsed loess landslides triggered by the earthquake. Their research, published in the journal ‘Geomatics, Natural Hazards & Risk’, investigates how such landslides can occur and what preventive measures can be taken to mitigate future risks.
Wang’s team utilized a range of advanced techniques to analyze the loess soil at the affected sites, including dynamic triaxial tests to assess the potential for seismic subsidence. They also performed large-scale shaking table tests to simulate the destabilization evolution of loess landslides. “By understanding the dynamic response of loess under seismic loads, we can better predict and potentially prevent catastrophic landslides in the future,” Wang remarked.
The implications of this research extend far beyond academic interest; they are crucial for the construction industry, which must grapple with the realities of building in seismically active regions. With the findings offering a theoretical foundation for future investigations, construction firms can integrate these insights into their planning and risk assessment protocols. This could lead to more resilient infrastructure that withstands the forces of nature, ultimately safeguarding investments and reducing economic losses.
The study draws parallels with historical seismic events, such as the 1920 Haiyuan MS8.5 earthquake and the 1995 Yongdeng MS5.8 earthquake, providing a broader context for understanding loess landslides. The insights gained could inform not just local construction practices but also contribute to global strategies for building in earthquake-prone areas.
As the construction sector continues to evolve, the integration of geological insights into design and engineering practices will be key to developing safer, more resilient structures. The research led by Yali Wang is a step in that direction, offering vital knowledge that could shape the future of construction in seismically active regions. For more information about the research team, you can visit the Lanzhou Institute of Seismology.
