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| SYNTHETICAL CONTROL TECHNIQUE AND ENGINEERING APPLICATION TO ROADWAY WITH FALSE-HARD ROOF HIGH SURROUNDING PRESSURE AND WATER DISTURBANCE |
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Abstract The composition of the roof rock has a great influence on the stability of the roadway surrounding，especially for those roadway with the false-hard roof，which will be easily weathered or be weakened when encountering water. The composition of the false-hard roof rock sampled from the 7244 working face was determined with the X-ray diffraction experiment. The mineral composition of the false-hard roof was obtained. The results explain why the roof rock strength becomes weak encountering water or weathering. The inherent mechanism of the loss of the prestressed bolting and loosening between bolts and surrounding rock was analyzed. On the basis of these analysis，the conclusion that the key technique is water control in such condition is proposed. False-hard roof can turn into true-hard roof when no water invading. Based on the supporting technique system of the high strength and high prestressed bolting，rock grouting and surface guniting can decrease or even avoid the water influence on the bolts，surrounding rock and coal. At last，a comprehensive measure，named three zones-three roofs-three supporting techniques，has been put forward and applied successfully in the 7244 roadway. This technique can be used in the similar roadway supporting.
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Received: 25 March 2005
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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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