|
|
|
| Study on damage and permeability evolution law of strong mining overburden rock |
| Zhang Yin |
| Guoneng Baotou Energy Lijiahao Coal Mine, Ordos 017000, China |
|
|
|
|
Abstract Shendong mining area belongs to the ecologically fragile area. The strong mining disturbance of the mine working face will lead to the damage of the overburden rock and the increase of the permeability evolution, which will cause the ecological environment of the mining area to be seriously damaged. Therefore, this paper takes Lijiahao Coal Mine as the research background, constructs a three-dimensional model of ' mining-induced fracture annular body ' and its boundary discrimination method. Through numerical simulation, the damage variation characteristics of overlying strata under strong mining disturbance are analyzed, and the fracture distribution law and permeability evolution law of overlying strata under strong mining disturbance are studied. The results show that the uniaxial compressive strength of the overlying strata in the goaf increases with the increase of the loading rate, and has obvious brittle failure behavior. In the simulation, it is found that the two ends of the working face can be divided into shear failure areas, while the overlying strata of the goaf are tensile failure areas. Under the influence of mining stress, the overlying strata structure, working face advancing speed and working face advancing length are important factors affecting the fracture development. With the mechanical increase of the elastic modulus of the overlying strata in the goaf, the seepage velocity shows a linear increase trend, and the pore water pressure also decreases. The research results are of great significance to the safe and efficient mining of coal mines and the protection of ecological environment in mining areas in China.
|
|
|
|
|
|
| [ 1 ] 侯恩科，陈 育，车晓阳，等. 浅埋煤层过沟开采覆岩破坏特征及裂隙演化规律研究[ J ]. 煤炭科学技术，2021，49（ 10 ）：185 - 192.
[ 2 ] HE J, LI W, QIAO W. A rock mechanics calculation model for id-
entifying bed separation position and analyzing overburden breakage in mining[ J ]. Arabian Journal of Geosciences，2020， 13（ 18 ）：1-17.
[ 3 ] Xiangfeng L, Hongyuan Z, Zhenwei W, et al. Movement and failure law of slope and overlying strata during underground mining[ J ]. Journal of Geophysics and Engineering, 2018, 15（ 4 ）：1 638
- 1 650.
[ 4 ] ZHA E, WU S, ZHANG Z, et al. Mining-induced mechanical re-
sponse of coal and rock at different depths: a case study in the Pingdingshan Mining Area[ J ]. Arabian Journal ofGeosciences，
2020，13（ 19 ）：1-11.
[ 5 ] 张学博，王 豪，沈帅帅. 小断层活化对采空区上覆岩层破
坏及渗透性影响[ J ]. 煤炭科学技术，2022，50（ 2 ）：75 -85.
[ 6 ] 蔚 波，王 皓，尚宏波. 煤层过沟开采覆岩破坏特征及地
表水入渗规律研究[ J ]. 煤矿安全，2022，53（ 6 ）：161 -168.
[ 7 ] 杨玉顺. 复杂应力作用下煤岩裂隙演化力学机理及瓦斯渗流
规律研究[ D ]. 重庆：重庆大学， 2019.
[ 8 ] Dawei Z, Kan W, Zhihui B, et al. Formation and development me-
chanism of ground crack caused by coal mining: effects of overlying
key strata[ J ]. Bulletin of Engineering Geology and the
Environment，2019，78（ 2 ）： 1 025 - 1 044.
[ 9 ] 周禹良，杨 雪，许发强. 综放工作面导水裂隙带高度分布
式光纤监测技术[ J ]. 中国矿业，2022，31（ 12 ）：108 - 114.
[ 10 ] Ye Q, Wang W, Wang G, et al. Numerical simulation on tendency
mining fracture evolution characteristics of overlying strata and
coal seams above working face with large inclination angle and
mining depth[ J ]. Arabian Journal of Geosciences，2017，10
（ 12 ）：1-15.
[ 11 ] 刘红威，赵阳升，Ren Tingxiang，等. 切顶成巷条件下采空
区覆岩破坏与裂隙发育特征[ J ]. 中国矿业大学学报，
2022，51（ 1 ）：77 - 89.
[ 12 ] Kong D, Pu S, Zheng S, et al. Roof Broken Characteristics and Ov-
erburden Migration Law of Upper Seam in Upward Mining of Close
Seam Group[ J ]. Geotechnical and Geological Engineering，2019，
37（ 4 ）：3 193 - 3 203.
[ 13 ] 郎 君. 煤层回采过程中覆岩破坏及裂隙演化规律[ J ]. 中国
测试，2022，48（ 3 ）：47 - 52.
[ 14 ] 贾 栋，姜德义，陈 结，等. 综放工作面覆岩破坏特征及
裂隙演化相似模拟试验研究[ J ]. 中国安全生产科学技术，
2022，18（ 3 ）：19 - 25. |
|
|
|
