Rheological Characteristics of Thickened Slurry for Preventing and Controlling Spontaneous Combustion of Coal in Underhand Working Face

Abstract

Abstract: In response to the problems of difficulty in grouting, high air leakage intensity, and inability to pile up slurry at high altitudes during the prevention and control process of coal spontaneous combustion in steep dip underhand working face, a slurry with different water to soil ratios and thickening agent concentrations was prepared using polymer material, surfactant, and solid phase materials as raw materials, and suspension stability experiments were conducted to study the suspension characteristics of thickened slurry. By conducting rheological characteristic tests on thickened slurry of different concentrations and fitting the rheological constitutive equation, a thickened slurry material with excellent performance and suitable for steep dip underhand working face was developed. Finally, Fluent software was used to simulate the diffusion characteristics of thickened slurry in the goaf. The research results indicate that loess is the most suitable solid phase material for thickened slurry. When the water to soil mass ratio is 8∶1 and the mass fraction of thickening agent is 0.3%, the suspension performance of thickened slurry is good, and its yield stress is the smallest, indicating better flowability. The flow velocity of thickened slurry in the goaf is inversely proportional to the diffusion radius, and the diffusion radius reaches its maximum value after 6 h of slurry injection.

Key words: steep dip underhand working face, thickened slurry, suspension characteristic, rheological characteristic, diffusion characteristic

CLC Number:

X936

ZHU Licheng, SHI Zhengjing, FANG Xiuzheng, LU Yi, WU Xiaoying, GUO Xin, XING Shunbo. Rheological Characteristics of Thickened Slurry for Preventing and Controlling Spontaneous Combustion of Coal in Underhand Working Face[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 27-34.

References

[1] 伍永平, 贠东风, 解盘石, 等. 大倾角煤层长壁综采: 进展、实践、科学问题[J]. 煤炭学报, 2020, 45(1): 24-34.
WU Y P, YUN D F, XIE P S, et al. Progress, practice and scientific issues in steeply dipping coal seams fully-mechanized mining[J]. Journal of China Coal Society, 2020, 45(1): 24-34 (in Chinese).
[2] 柳东明. 火成岩侵入易自燃煤层超长俯采工作面采空区自燃“三带”分布范围研究[J]. 矿业安全与环保, 2022, 49(4): 135-139.
LIU D M. Study on the distribution range of spontaneous combustion “three zones” in goaf of ultra-long caving face with igneous rock invading spontaneous combustion coal seam[J]. Mining Safety & Environmental Protection, 2022, 49(4): 135-139 (in Chinese).
[3] 唐辉. 易自燃煤层超长俯采工作面防灭火技术研究[J]. 煤炭技术, 2022, 41(4): 86-89.
TANG H. Research on fire-fighting technology of overlong overhand mining face in spontaneous combustion coal seam[J]. Coal Technology, 2022, 41(4): 86-89 (in Chinese).
[4] 刘洪林, 曹文祥, 单成方, 等. 大倾角煤层采动覆岩破断特征相似模拟实验研究[J]. 新疆大学学报(自然科学版)(中英文), 2020, 37(3): 301-308.
LIU H L, CAO W X, SHAN C F, et al. Similar simulation experimental study on fracture characteristics of overburden strata under mining with large dip angle[J]. Journal of Xinjiang University (Natural Science Edition) (in Chinese and English), 2020, 37(3): 301-308 (in Chinese).
[5] 王宁, 张海军. 浅埋深近距离煤层工作面漏风测定及防治技术[J]. 煤炭科学技术, 2021, 49(增刊2): 131-134.
WANG N, ZHANG H J. Measurement and prevention technology of air leakage in shallow buried deep close seam face[J]. Coal Science And Technology, 2021, 49(supplement 2): 131-134 (in Chinese).
[6] 王上, 刘松辉, 周蓉, 等. 超轻硫铝酸盐水泥基发泡材料的制备及硬化性能研究[J]. 硅酸盐通报, 2021, 40(3): 723-730+740.
WANG S, LIU S H, ZHOU R, et al. Preparation and hardening performance of ultra-light sulphoaluminate cement-based foaming material[J]. Bulletin of the Chinese Ceramic Society, 2021, 40(3): 723-730+740 (in Chinese).
[7] 鲁义, 秦波涛, 王海桥, 等. 封堵高温裂隙的水泥基泡沫流体耐热性研究[J]. 硅酸盐通报, 2017, 36(5): 1499-1504+1517.
LU Y, QIN B T, WANG H Q, et al. Heat resistance of foam cement fluid for sealing high temperature fracture[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(5): 1499-1504+1517 (in Chinese).
[8] 鲁义, 王涛, 田兆君, 等. 倾斜煤岩裂隙通道中水泥基泡沫流变特性研究[J]. 硅酸盐通报, 2017, 36(9): 2929-2934.
LU Y, WANG T, TIAN Z J, et al. Rheological properties of cement based foam in inclined coal fracture channels[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(9): 2929-2934 (in Chinese).
[9] 张玉涛, 史学强, 李亚清, 等. 环保型煤自燃阻化剂的阻化特性及机理研究[J]. 中国矿业大学学报, 2018, 47(6): 1224-1232.
ZHANG Y T, SHI X Q, LI Y Q, et al. Mechanism and inhibiting effects of environmental-friendly inhibitor on coal spontaneous combustion[J]. Journal of China University of Mining & Technology, 2018, 47(6): 1224-1232 (in Chinese).
[10] 武建明. 近距离煤层综采工作面灌浆防灭火技术应用[J]. 山东煤炭科技, 2021, 39(12): 84-86.
WU J M. Application of grouting fire prevention and extinguishing technology in fully mechanized mining face in short distance coal seam[J]. Shandong Coal Science and Technology, 2021, 39(12): 84-86 (in Chinese).
[11] 冀文俊. 综放工作面采空区灌浆防灭火技术研究[J]. 山西化工, 2022, 42(7): 110-111.
JI W J. Study on fire prevention and extinguishing technology of grouting in goaf of fully mechanized top-coal caving face[J]. Shanxi Chemical Industry, 2022, 42(7): 110-111 (in Chinese).
[12] 路宁. 大南湖一矿采空区灌浆防灭火技术研究[J]. 山东煤炭科技, 2020(11): 94-97.
LU N. Study on grouting fire prevention and extinguishing technology in goaf of Dananhu No.1 mine[J]. Shandong Coal Science and Technology, 2020(11): 94-97 (in Chinese).
[13] 时国庆, 王德明, 李祥武, 等. 急倾斜俯采综放工作面封闭火区治理技术与实践[J]. 煤矿安全, 2008, 39(5): 38-40.
SHI G Q, WANG D M, LI X W, et al. Treatment technology and practice of closed fire area in fully mechanized top-coal caving face with steep dip and downward mining[J]. Safety in Coal Mines, 2008, 39(5): 38-40 (in Chinese).
[14] 张德鹏, 段西凯. 葛亭煤矿俯采面采空区自然发火防治技术[J]. 煤矿安全, 2017, 48(3): 79-81.
ZHANG D P, DUAN X K. Spontaneous combustion preventing and control technology for underhand stoping working face goaf of geting coal mine[J]. Safety in Coal Mines, 2017, 48(3): 79-81 (in Chinese).
[15] 李方磊, 贾玉威, 鲁义. 防治煤自燃的新型高水稠化剂研制及应用[J]. 矿业安全与环保, 2014, 41(2): 9-12.
LI F L, JIA Y W, LU Y. Development and application of new high-moisture thickener for prevention of coal spontaneous combustion[J]. Mining Safety & Environmental Protection, 2014, 41(2): 9-12 (in Chinese).
[16] 陈凯. 粉煤灰稠化胶体的制备及防灭火特性研究[D]. 徐州: 中国矿业大学, 2020.
CHEN K. Preparation of fly ash thickening colloid and its fire prevention and extinguishing characteristics[D]. Xuzhou: China University of Mining and Technology, 2020 (in Chinese).
[17] LYU C, LIU J F, REN Y, et al. Mechanical characteristics and permeability evolution of salt rock under thermal-hydro-mechanical (THM) coupling condition[J]. Engineering Geology, 2022, 302: 106633.
[18] 题正义, 秦洪岩, 乔宁, 等. 大倾角综放采空区注浆防灭火浆液扩散模拟研究[J]. 中国安全科学学报, 2016, 26(1): 51-57.
TI Z Y, QIN H Y, QIAO N, et al. Simulation of slurry diffusion involved in fire prevention in large dip angle fully mechanized caving gob by grouting[J]. China Safety Science Journal, 2016, 26(1): 51-57 (in Chinese).