标题：Study on new polymer spray-layer material and its spray support technology for weakly cemented rock roadway
作者：Li, Xuebin ;Qu, Guanglong ;Yang, Chunman ;Teng, Deqiang
作者机构：[Li, Xuebin ] School of Safety Engineering, North China Institute of Science & Technology, Langfang; Hebei; 065201, China;[Yang, Chunman ;Teng, Deqian 更多
来源：Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering
摘要：The ordinary concrete-spraying supporting technology is to a certain extent difficult to meet the requirements of high-efficiency green production in the coalmine with weakly cemented soft rock. It is because the ordinary technology always has following shortcomings: high rebound rate of sprayed material, large concentration of dust in construction site and uneven spray strength. In this study, the main influencing factors of shotcrete support in soft rock roadway were determined by theoretical analysis, including bonding, strength and toughness. Meanwhile, based on the traditional tidal spray concrete material, the mixing ratio of new polymer spray material and the mechanical properties were determined by optimizing the proportion of polymer powder, short crack-resistant staple fiber, organic emulsion and other components in the indoor material proportioning test. Taking into account the construction requirements in coalmine roadway and other small underground space jetting, the power source of screw pump, the structure of spray gun and the stirring feed system layout were improved. A new polymer spray supporting construction technology was established to meet the requirements of high-efficiency green production in coalmine roadway. Field tests on 100m roadway supporting were conducted in Hongqingliang coalmine. After six months, the roadway surface is not smooth when the traditional supporting method was adopted, and the phenomena of cracking and water leakage occur. In contrast, the new polymer shotcrete in watering section of roadway was completely crack-free, the forces of anchor bolt and cable were small. Therefore, the new supporting technique is capable of maintaining the long-term stability of weakly cemented rock roadway in western China.
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