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| Seventy years development and prospects of strata control technologies for coal mine roadways in China |
| KANG Hongpu1,2,3 |
| (1. Coal Mining Research Institute,China Coal Technology and Engineering Group Co. Ltd.,Beijing 100013,China;2. Coal Mining Branch,China Coal Research Institute,Beijing 100013,China;3. State Key Laboratory of Coal Mining and Clean Utilization,Beijing 100013,China) |
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Abstract This paper summarizes the main research achievements associated with roadway strata control during 70 years since the founding of new China,including the geomechanics properties of rocks surrounding roadways,the features and mechanisms of surrounding rock deformation and damage,and strata control theories and techniques. The strength and structural features of sedimentary coal strata,the distribution laws of in-situ stresses in underground coal mines,and the distribution characteristics of coal mining induced stresses and their actions on the surrounding rock stability of mine roadways are introduced. It is pointed out that the deformation features of rocks surrounding coal mine roadways are staged pattern,rheology and impact,that there exist three damage types in surrounding rock including coal and rock damage,structure plane damage and rock structural instability,and that soft rock,intensive mining induced stresses and large deformation are distinguished features for roadway strata control in China. Five types of roadway strata control methods and principles,involving controlling broken surrounding rocks,controlling rock deformation,forming load bearing unit,rock modification and distressing,are discussed. The whole process control principles for surrounding rocks during heading are expounded,and the pretension rock bolting theory and support stress fields are especially introduced. The roadway strata control techniques are divided into five classes including rock surface support,rock bolting,rock modification,destressing and combined control,and the development history and applications of steel arches,rock bolts and cables,grouting,destressing with hydraulic fracturing and combined control pattern are discussed. Finally,the existing problems associated with roadway strata control in underground coal mines are analyzed,and the technical development prospects in the future are put forward.
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LI Botao1, 2, 3, TAN Yuxuan1, LIN Haifei4, 5*, WEI Jianping1, 2, 3, ZHANG Hongtu1, 2, 3, LI Shugang4, 5, WEI Zongyong4, 5, WANG Pei4, LUO Rongwei4, LIU Yanwei1, 2, 3. Mechanical properties and mesoscopic damage evolution of coal under liquid-nitrogen freezing at different initial temperatures[J]. , 2026, 45(6): 1757-1772. |
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