为了探索煤层在原位超临界水环境下改性的渗流和变形特性,将煤炭超临界水处理技术和原位改性采矿技术相结合,以⌀25mm×50mm寺河矿无烟煤为样本,在三轴应力条件下开展了超临界水环境下的渗流及变形特性研究。研究结果表明,在365、400、435℃的亚临界和超临界水注水条件下,无烟煤的渗透率分别比原煤下降了56.75%、96.93%和94.99%,整体渗透率的变化趋势为先快速降低再略微升高;实验初期无烟煤的渗流通道会逐渐闭合,持续注热一段时间后,渗流现象会再次恢复,恢复时间约43.5、24.54、19.81h;渗流恢复同时伴随剧烈的轴向压缩变形,试验温度越高,最终轴向压缩应变越大,约为0.06、0.11、0.16。

In order to explore the seepage and deformation characteristics of coal seams modified in in-situ supercritical water environment, we combined coal supercritical water treatment technology and in-situ modified mining technology to study the percolation and deformation characteristics of anthracite coal of ⌀ 25 mm × 50 mm in the Sihe Mine under triaxial stress supercritical water environment. The results show that under the subcritical and supercritical water injection conditions of 365 ℃ , 400 ℃ and 435 ℃ , the permeability of anthracite coal decreases by 56. 75%, 96. 93% and 94. 99%, respectively; Compared with the original coal, and the overall permeability changes in the trend of rapid decrease and then slightly increase; The percolation channels of anthracite coal in the early stage of the experiment will gradually close, and after a period of continuous heat injection, the percolation phenomenon will recover, and the recovery time is about 43. 5, 24. 54 and 19. 81 h; the recovery is accompanied by a sharp axial compression deformation, and the higher the test temperature is, the larger the axial compression deformation is, about 0. 06, 0. 11 and 0. 16.