Key Takeaways & Executive Findings
- •• Rockburst occurs only when geostress exceeds a critical threshold, with key influencing factors being geostress, rock brittleness, uniaxial compressive strength, and excavation size. • Support devices control rockburst by suppressing the squeezing evolution of surrounding rock toward instability points, with higher strength and longer impact stroke facilitating multiple balance points. • Long impact stroke supports adapt to varying geostress levels, enhancing rockburst control effectiveness. • The design criterion for supports is the intersection of the surrounding rock convergence curve and the support squeezing deformation curve, providing a quantitative method for support design.
Abstract
Rockbursts, which mainly affect mining roadways, are dynamic disasters arising from the surrounding rock under high stress. Understanding the interaction between supports and the surrounding rock is necessary for effective rockburst control. In this study, the squeezing behavior of the surrounding rock is analyzed in rockburst roadways, and a mechanical model of rockbursts is established considering the dynamic support stress, thus deriving formulas and providing characteristic curves for describing the interaction between the support and surrounding rock. Design principles and parameters of supports for rockburst control are proposed. The results show that only when the geostress magnitude exceeds a critical value can it drive the formation of rockburst conditions. The main factors influencing the convergence response and rockburst occurrence around roadways are geostress, rock brittleness, uniaxial compressive strength, and roadway excavation size. Roadway support devices can play a role in controlling rockburst by suppressing the squeezing evolution of the surrounding rock towards instability points of rockburst. Further, the higher the strength and the longer the impact stroke of support devices with constant resistance, the more easily multiple balance points can be formed with the surrounding rock to control rockburst occurrence. Supports with long impact stroke allow adaptation to varying geostress levels around the roadway, aiding in rockburst control. The results offer a quantitative method for designing support systems for rockburst-prone roadways. The design criterion of supports is determined by the intersection between the convergence curve of the surrounding rock and the squeezing deformation curve of the support devices.
1. Introduction
Rockburst is a dynamic disaster characterized by the instantaneous release of elastic energy stored in the surrounding rock under high stress. It is a widely recognized problem, with more than 95% of rockburst events in China occurring along roadways [1–3]. Whether in the preparation process or after occurrence of rockburst, a squeezing behavior will be formed between the roadway and support [4]. Naturally, this squeezing behavior can be considered as a dynamic loading interaction between the roadway and support equipment. Quantitatively understanding the dynamic interaction between the rock support and surrounding rock in rockburst roadways is critical for support selection to control rockburst.
Recently, the development and design of support systems to prevent and mitigate dynamic disasters in deep mining have become important topics. Existing research focuses on characterizing the interaction between support equipment and surrounding rock, as well as on the design and development of support materials and equipment. In their research on this interaction, Wang and Pang [5] examined the coupling relationship between support and surrounding rock using theoretical analysis methods. They proposed stiffness, strength, and stability coupling types between the support and surrounding rock, highlighting that the stability of the support and its adaptability to the surrounding rock instability are crucial to ensure the stability coupling of the support-surrounding rock system. Cai [6] emphasized that effective rock support is the last line of defense for ensuring mine safety.
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DAI Lianpeng, FENG Dingjie, PAN Yishan, WANG Aiwen, MA Ying, XIAO Yonghui, ZHANG Jianzhuo (2024). Quantitative principles of dynamic interaction between rock support and surrounding rock in rockburst roadways. SinoTechIntel Verified Research. https://doi.org/10.1016/j.ijmst.2024.12.009
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Frequently Asked Questions
What is the main contribution of this paper?
The paper establishes a mechanical model of rockbursts considering dynamic support stress, deriving formulas and characteristic curves for the interaction between support and surrounding rock, and proposes quantitative design principles for supports in rockburst-prone roadways.
What are the key factors influencing rockburst occurrence in roadways?
The main factors are geostress, rock brittleness, uniaxial compressive strength, and roadway excavation size.
How do support devices control rockburst?
Support devices control rockburst by suppressing the squeezing evolution of the surrounding rock towards instability points, with higher strength and longer impact stroke facilitating multiple balance points.
What is the design criterion for supports in rockburst roadways?
The design criterion is determined by the intersection between the convergence curve of the surrounding rock and the squeezing deformation curve of the support devices.
Why is long impact stroke beneficial for supports?
Long impact stroke allows supports to adapt to varying geostress levels around the roadway, aiding in rockburst control.
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