In a groundbreaking study published in the Journal of Mining Science, researchers have unveiled new insights into the stability of roadway surrounding rock under three-dimensional stress fields, utilizing the Drucker-Prager strength criterion. This research, led by Liu Hongtao from the School of Energy and Mining Engineering at the China University of Mining and Technology-Beijing, addresses a critical challenge in mining and construction: ensuring the safety and integrity of roadways in complex geological conditions.
The study meticulously deduces the boundary equations of plastic zones in surrounding rock, highlighting how variations in stress can dramatically alter the shape and size of these zones. Liu emphasizes the significance of their findings, stating, “Understanding the plastic zone morphology is essential for predicting potential failures in roadway structures. Our research demonstrates that both horizontal and axial stresses play crucial roles in shaping these zones.”
One of the most striking revelations from the study is the impact of horizontal stress on the plastic zone morphology. The researchers found that extreme variations can lead to a butterfly-shaped expansion, a phenomenon that could pose serious risks to roadway stability. Conversely, while axial pressure has less effect on the shape, it significantly influences the size of the plastic zone, leading to what the researchers describe as a bowl-shaped development. This nuanced understanding provides engineers with critical data to better predict and mitigate risks associated with roadway construction.
The research also delves into the implications of varying cohesion, internal friction angles, and roadway radius on the plastic zone size under different Drucker-Prager criteria. Liu notes, “Our findings reveal that the choice of yield criteria can substantially affect the calculations of plastic zones, which in turn influences engineering decisions.” This insight is particularly vital for the construction sector, where precise calculations can mean the difference between a safe, stable structure and a catastrophic failure.
As the construction industry increasingly faces challenges related to ground stability and safety, this research paves the way for more informed decision-making and improved engineering practices. The ability to accurately model the behavior of surrounding rock under varying stress conditions could not only enhance safety but also lead to more efficient use of resources, ultimately reducing costs and improving project timelines.
This study is a significant contribution to the field, providing a clearer understanding of the complex interactions between stress fields and surrounding rock behavior. It underscores the importance of rigorous scientific research in shaping the future of construction and mining practices. The findings, published in the Journal of Mining Science, have the potential to influence engineering protocols and standards, ensuring that roadway support systems are both safe and effective.
For more information about Liu Hongtao and his research, you can visit the School of Energy and Mining Engineering at the China University of Mining and Technology-Beijing.
