Study and discussion of short- strip coal pillar recovery with cemented paste backfill
Study and discussion of short- strip coal pillar recovery with cemented paste backfill
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DOI：
10.1016/j.ijrmms.2018.01.031
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发表时间：
2018-04
影响因子：
7.2
通讯作者：
Qiang Sun;Jixiong Zhang;N. Zhou
中科院分区：
文献类型：
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作者：
Qiang Sun;Jixiong Zhang;N. Zhou
煤柱的长期稳定性控制是矿房开采面临的最大难题之一。不稳定的煤柱可能被留在地下，导致顶板突然塌陷到采空区，地表沉陷和其他重大危害。在中国西部生态脆弱地区（内蒙古、陕西和宁夏），埋藏深度较浅（0-300 m）的优质煤炭资源丰富，占中国煤炭储量的85%以上。1、2随着西部大开发战略的深入推进，西部矿区已成为我国煤炭开采的重点，具有良好的地质条件和开采的天然优势。为了应对第四系松散层和厚表土层风积砂中潜水孔隙水的影响，我国西部地区90%以上的煤矿采用了房式采煤法，以提高安全生产。3、4根据近年来的研究成果，采用该方法对长期荷载作用下的遗留煤柱进行了弱化。煤柱极易失稳破坏，在地方煤矿造成上述危害。因此，保护西部地区的经济和社会发展必须解决这个问题。在过去的几十年里，人们进行了大量的研究来确定中国西部生态脆弱地区的问题。9，10，11水泥浆充填技术具有经济效益和环境效益，在我国地下矿山得到了广泛应用。此外，CPB还提供地面和墙壁支撑，并促进矿山废物处理。因此，它限制了塌陷的可能性并防止沉降。12此外，CPB技术大大改善了地下采矿作业的安全性，提高了生产率;因此，它现在被认为是全世界采矿作业的标准做法。13，14然而，由于充填材料和充填成本之间的差异，研究人员至今尚未找到适合在中国地方煤矿广泛使用的快速采煤方法。
The long-term stability control of coal pillars is one of the most difficult problems facing miners in room mining. Coal pillars that are instable may have been left behind underground, resulting in roofs caving suddenly into the gob, surface subsidence, and other significant hazards. In the ecologically vulnerable areas of western China (Inner Mongolia, Shaanxi, and Ningxia), there are vast high-quality coal resources at shallow burial depths (0–300 m) and they constitute more than 85% of the total coal deposits in China. 1, 2 The western mining area has become the focus of coal mining in China because of the intense progress of the West China Development Strategy, and it has natural advantages of favorable geological conditions associated with mining. To respond to the effects of phreatic pore water in the loose beds of the Quaternary system and in the thick surface layer of aeolian sand, 90% of coal mines in the western area of China adopt the room mining method to enhance safety. 3, 4 Based on recent research studies, the left behind coal pillar under long-term loading is weakened by this method. The pillars can be easily damaged by destabilization, causing the above-mentioned hazards in local coal mines. 5, 6, 7, 8 Therefore, this issue must be addressed to protect the economic and social development of western China.In the past several decades, a number of studies have been conducted to determine the problems in ecologically fragile western areas of China. 9, 10, 11 Cemented paste backfill (CPB) technology, which offers both economic and environmental benefits, has been used extensively in the underground mines of China. In addition, CPB provides ground and wall support, and it also facilitates mine waste disposal. Thus, it limits the likelihood of caving and prevents subsidence. 12 In addition, CPB technology significantly improves the safety in underground mine operations and increases productivity; therefore, it is now considered a standard practice in mining operations worldwide. 13, 14 However, because of the difference between the backfill materials and filling costs, researchers have not found a rapid backfilling coal mining method that is suitable for wide use in local coal mines of China till date.