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| Study on surrounding rock instability characteristics and support technology of intersection roadway |
| Jiang Bo1,2, Zhu Yanjun3 |
| 1. Inner Mongolia University of Science and Technology, Baotou 014010, China; 2.North Weijiamao Coal Power Co.,Ltd., Ordos 010308, China; 3. Beijing Tiandi Huatai Mining Management Co.,Ltd., Beijing 100013, China |
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Abstract Complex coal and rock roadways are arranged in the underground mining of coal mine, and the form of intersection arrangement is particularly common, but the stress condition of surrounding rock of intersection roadway is complex, and there are serious hidden dangers of roof falling and roadway slope instability. Aiming at this engineering safety problem, the stress deformation, failure and instability characteristics of bifurcated roadway, and the control methods of surrounding rock stability of this roadway were analyzed by way of numerical simulation. The active support mode of anchor cable anchorage suspension of roof surrounding rock and anchor cable anchorage of roadway side surrounding rock were put forward, the active support scheme of anchor bolt + double-layer metal mesh + steel belt + anchor cable was determined. Through the monitoring and feedback of surrounding rock deformation of No.15109 auxiliary transportation intersection roadway on site, the control effect of the proposed support technical scheme was good and met the requirements of safety production.
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