高流态封孔注浆材料力学性能及水化机制

doi:10.16265/j.cnki.issn1003-3033.2024.02.0710

中国安全科学学报 ›› 2024, Vol. 34 ›› Issue (2): 168-175.doi: 10.16265/j.cnki.issn1003-3033.2024.02.0710

高流态封孔注浆材料力学性能及水化机制

郭鑫¹(), 鲁义¹^,²^,^**(), 施式亮¹, 李贺¹, 李大芳¹

¹ 湖南科技大学资源环境与安全工程学院,湖南湘潭 411201
² 湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室,湖南湘潭 411201

收稿日期:2023-08-16 修回日期:2023-11-18 出版日期:2024-02-28
通讯作者:
** 鲁义(1986—),男,江西新干人,博士,教授,主要从事火灾科学与技术和煤自燃与瓦斯复合灾害防治等方面的研究。E-mail: luyijx@163.com。
作者简介:
郭鑫 (1994—),男,山东菏泽人,博士,讲师,主要从事矿井灾害防治等方面的研究。E-mail: guoxin190510@163.com。
施式亮教授
李贺副教授
基金资助:
国家重大人才工程青年项目(2022QB06801); 湖南省杰出青年基金资助(2022JJ10026); 湖南省青年基金资助(2023JJ40284)

Mechanical properties and hydration mechanism of high-flow sealing hole grouting material

GUO Xin¹(), LU Yi¹^,²^,^**(), SHI Shiliang¹, LI He¹, LI Dafang¹

¹ School of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan Hunan 411201, China
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 Hunan 411201, China

Received:2023-08-16 Revised:2023-11-18 Published:2024-02-28

摘要/Abstract

摘要：

为提高深部矿井煤层气抽采效率,针对目前常见的封孔注浆材料存在的高分子封孔材料价格昂贵易燃、普通水泥材料渗透性差、粉煤灰等膏体材料强度不足等问题,采用超细水泥为基料研发一种高流态封孔注浆材料。通过对高流态封孔注浆材料开展力学性能试验研究、结合扫描电镜(SEM)、X射线衍射(XRD)等一系列试验的结果,揭示新型高流态封孔注浆材料水化机制。结果表明:高流态封孔注浆材料在水化初期就生成大量的水化硅酸钙(C-S-H)凝胶和钙矾石(AFt)晶体;随着水化反应的持续,水化产物的凝胶粒子充填材料中的孔隙。与普通水泥封孔注浆材料相比,材料的水化反应更迅速、更充分、整体结构致密,比普通水泥封孔注浆材料抗压强度提高3.68%,更有利于保持瓦斯抽采钻孔的稳定性,提高瓦斯抽采效率。

关键词: 高流态封孔, 注浆材料, 抽采钻孔, 水化反应, 水化产物

Abstract:

To improve coalbed methane extraction efficiency in deep mines, a high-flow sealing hole grouting material was developed using superfine cement as the base material to overcome issues of commonly used high polymer sealed materials such as high cost and flammable, low permeability of ordinary cement materials, and insufficient strength of paste materials such as fly ash. The hydration mechanism of the developed high-flow sealing grouting material was explored by an experimental study on the material's mechanical properties, combined with the measurements by scanning electron microscope(SEM)and X-ray diffraction(XRD). The results indicated that a large amount of calcium silicate hydrate (C-S-H) gel and ettringite (AFt) crystals were generated in the high-flow sealing grouting material during the initial phase of hydration. Furthermore, the gel particles of hydration products filled the pores of the material with the hydration reaction. Compared to commonly used cement sealing grouting material, the hydration reaction of the developed material was much faster and more complete, and the overall structure was more denser. Moreover, the compressive strength was increased by 3.68%. Therefore, the developed high-flow sealing hole grouting material can maintain the stability of gas extraction boreholes and improve gas extraction efficiency.

Key words: high-flow sealing, grouting material, drainage borehole, hydration reaction, hydration product

中图分类号:

X936

郭鑫, 鲁义, 施式亮, 李贺, 李大芳. 高流态封孔注浆材料力学性能及水化机制[J]. 中国安全科学学报, 2024, 34(2): 168-175.

GUO Xin, LU Yi, SHI Shiliang, LI He, LI Dafang. Mechanical properties and hydration mechanism of high-flow sealing hole grouting material[J]. China Safety Science Journal, 2024, 34(2): 168-175.

图/表 11

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化学成分	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	SO₃	损失量	共计
HCSA膨胀剂	4.96	8.52	0.99	64.18	2.67	16.97	1.19	99.48
超细硅酸盐水泥	20.57	9.89	3.08	57.65	2	2.7	2.6	98.49

高流态封孔注浆材料力学性能及水化机制

Mechanical properties and hydration mechanism of high-flow sealing hole grouting material

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