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A Study on the Fracture Control of Rock Bolts in High Ground Pressure Roadways of Deep Mines

机译：深井高地压巷道锚杆断裂控制研究

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摘要

According to the frequent fractures of rock bolts in high ground pressure roadways of deep mines, this paper analyzes the mechanism of fractures and concludes that high ground pressure and material de-fects are main reasons for the fracture of rock bolts. The basic idea of fracture control of rock bolts in high ground pressure roadways of deep mines is to increase the yield load and the limit load of rock bolt materials and reduce the actual load of rock bolts. There are four ways of controlling rock bolt fracture: increasing the rock bolt diameter, strengthening bolt materials, weakening support rigidity and the implementation of double supporting. With the roadway support of the 2302 working face of a coal mine as the project background, this paper carries out a study on the effect of two schemes, increasing the rock bolt diameter and the double supporting technique through methods of theoretical analysis, numerical simulation and so on. It determines the most reasonable diam-eter of rock bolts and the best delay distance of secondary support. Practices indicate that rock bolt fracture can be effectively controlled through the double supporting technique, which strengthens the roof and two sides through the first supporting technique and strengthens side angles through the secondary supporting technique.Key words: deep mine / high ground pressure roadway / rock bolting / fracture control
机译：针对深井高地压巷道锚杆经常断裂的情况，分析其断裂机理，认为高地压和材料缺陷是造成锚杆断裂的主要原因。深井高地压巷道锚杆断裂控制的基本思想是增加锚杆材料的屈服荷载和极限荷载，降低锚杆的实际荷载。控制锚杆断裂的方法有四种：增加锚杆直径，加强锚杆材料，削弱支座刚度和实施双支座。以煤矿2302工作面的巷道支护为工程背景，通过理论分析，数值模拟和数值模拟的方法，研究了两种方案的效果，即增大岩壁锚杆直径和双重支护技术。以此类推。它确定了最合理的锚杆直径和辅助支撑的最佳延迟距离。实践表明，采用双支护技术可以有效地控制锚杆断裂，通过第一支支护技术可以加固顶板和两侧，通过第二支支护技术可以提高侧倾角。关键词：深井/高地压巷道/岩石螺栓/断裂控制

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