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。
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.
作者
郭鑫
鲁义
施式亮
李贺
李大芳
GUO Xin;LU Yi;SHI Shiliang;LI He;LI Dafang(School of Resource,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan Hunan 411201,China;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)
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2024年第2期168-175,共8页
China Safety Science Journal
基金
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)。
关键词
高流态封孔
注浆材料
抽采钻孔
水化反应
水化产物
high-flow sealing
grouting material
drainage borehole
hydration reaction
hydration product
