Development of elastic cemented material for consolidating cracks around drilling holes in gas drainage in soft coal seams

被引：0
作者：
Lu Y. [1 ,2 ]
Gu W. [1 ]
Ding Y. [3 ]
Li X. [3 ]
Li L. [3 ]
机构：
[1] School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan
[2] Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan
[3] Luwa Coal Mine, Shandong Lutai Holding Group Co., Ltd., Jining
来源：
Meitan Kexue Jishu/Coal Science and Technology (Peking) | 2022年 / 50卷 / 02期
关键词：
crushing; elastic cemented material; gas drainage; instability of borehole; mechanical properties; optimal content; soft coal seams;
D O I：
10.13199/j.cnki.cst.2021-0429
中图分类号：
学科分类号：
摘要：
In order to consolidate the cracks around the borehole in the coal seam, an elastic cemented material for fracture consolidation of coal and rock was prepared by using polydimethylsiloxane, PMHS, polypropylene fiber and straw fiber as raw materials. The micro mor⁃ phology of polypropylene fiber and straw fiber in the elastic cemented material was observed by scanning electron microscope and particle analyzer.The effects of different contents of polypropylene fiber and straw fiber on the mechanical properties of elastic cementitious materi⁃ als were studied by universal testing machine The results show that: adding a certain amount of polypropylene fiber and straw fiber can en⁃ hance the mechanical properties of elastic cemented material;With the increase of content of polypropylene fiber and straw fiber, the me⁃ chanical properties of elastic cemented material became worse;The optimal content of polypropylene fiber-straw fiber was 0.6%-1%.Poly⁃ propylene fiber can be used as a connecting material to bridge the internal discontinuous area of elastic cemented material. At the same time, the surface of polypropylene fiber is rough, which can bond more colloids and increase the resistance of polypropylene fiber degum⁃ ming. When the content of straw fiber is 0.5% and 1%, the straw fiber dispersion in the material is better, and when the content is 1.5%, the straw fiber in the material begins to appear agglomeration.When the content is 2%, the agglomeration was serious.The elastic cemented material had good cohesiveness with the coal, which can bond the loose coal together to form a whole, with a certain mechanical strength. The reinforced coal module gradually deformed in the process of force loading, but the reinforced coal is not crushed, and still maintains good integrity.The field test showed that the gas mixed flow decreased slowly with the increased of the extraction time, and there was no sharp fluctuation or decrease of gas mixing flow, which proved that there was no instability problem in the borehole during the extraction process, and the borehole wall remained intact. © 2022 China Coal Society. All Rights Reserved.
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页码：129 / 136
页数：7
相关论文
共 20 条
  • [1] LU Yi, SHEN Hongmin, QIN Botao, Et al., Gas drainage radius and borehole distance along seam, Journal of Mining & Safety Engi⁃ neering, 32, 1, pp. 156-162, (2015)
  • [2] ZHAO Jing, PI Xiyu, WANG Shuanlin, Et al., Gas drainage technology with high level borehole at coal mining face in gassy thin seam, Coal Science and Technology, 43, 11, pp. 78-82, (2015)
  • [3] CHEN Dianfu, LU Yi, Research and applicationon comprehensive gas treatment technology in upper corner of working face, Coal Science and Technology, 41, 10, pp. 57-59, (2013)
  • [4] HOU Hong, JIN Xin, TONG Bi, Technology of drilling with casing protection hole for cross layer drainage borehole in strong outburst coal seam, Coal Science and Technology, 46, 11, pp. 140-144, (2018)
  • [5] JIAO Rongkun, ZHANG Xuebo, LI Yi, Research on negative pressure distribution laws of drainage borehole with different de⁃ formation andinstability, Industry and Mine Automation, 45, 5, pp. 40-45, (2019)
  • [6] (2014)
  • [7] XIAO Lihui, LI Yanming, GUO Kunming, Et al., Study on gas drain⁃ age technology of screen pipe putting down along full length bore⁃ hole in soft outburst seam, Coal Science and Technology, 42, 7, pp. 61-64, (2014)
  • [8] FENG Dajun, KONG Wei, XU Shubin, Et al., Ap-plication of new gas drainage hole drilling technology in soft coal seam in pingdings⁃ han No.10 mine, Mining Safety & Environment-al Protection, 40, 4, pp. 69-72, (2013)
  • [9] (2015)
  • [10] SHI Haoyu, MA Nianjie, XU Haitao, Discussion on mechanism of coal and gas outburst based on energy theory, Journal of Safety Science and Technology, 15, 1, pp. 88-92, (2019)
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