| Citation: |
WANG Beifang，LYU Yuanhao，ZHANG Jing. Zone feature and control technology of overlying strata mining-induced fracture in shallow buried compound goaf[J]. Coal Science and Technology，2025，53（2）：41−52. DOI: 10.12438/cst.2024-0715
|
The overlying strata fracture caused by shallow and close coal seam mining is developed, and air leakage condition is complicated, which leads to prominent hidden danger of residual coal spontaneous combustion and seriously restricts the safe and efficient production of Lijiahao coal mine. Therefore, similar experiment and numerical simulation were used to delimit mining-induced fracture zone in overlying strata of shallow buried compound goaf, fractal geometry theory was utilized for quantifying the fracture in zone of overlying strata. Based on the key layer theory, the cause of the overlying strata fracture zone was revealed and targeted control technology plan was proposed. The results showed that, the overlying strata fracture circularly opened and closed during 31114 working face mining, while the surface periodically produced dip dynamic crack behind the working face. Ultimately, the fracture distribution in overlying strata of shallow buried compound goaf presented “M shaped”, which could be divided into irregular fracture zone Ⅰ in caving zone, oblique breaking fracture zone Ⅱ, Ⅲ and oblique separation fracture zone Ⅳ in fracture zone and the edge crack was formed inside the goaf boundary. Among them, the void of fracture zone Ⅰ intricately developed and disorderedly distributed, so the fractal dimension of the fracture network was the largest, 1.569. Then followed by fracture zone Ⅱ, Ⅲ and Ⅳ, 1.531, 1.396 and 1.438 respectively. The mechanical model and instability criterion about “voussoir beam” structure of broken key rock block in overlying strata of shallow buried compound goaf were built to explain that the rotation deformation and instability of the “voussoir beam” structure of key layer in main roof led to the oblique breaking fracture opening in fracture zone Ⅱ and Ⅲ, while the combination bearing effect of the “voussoir beam” structure of key layers in main roof and interlayer resulted in oblique separation fracture development in fracture zone Ⅳ. The surface-underground collaboration control technology of overlying strata oblique fracture and surface crack in shallow buried compound goaf was put forward. That was the advancing speed of the working face was increased to 14 m/d at the stage of entering and leaving the overlying goaf and final mining, combined with backfilling wind-deposited sand and covering loess to deal with surface crack of fracture zone Ⅱ, Ⅲ and Ⅳ. SF6 tracer technique test proved that the surface air leakage was small and the control effect of overlying strata mining-induced fracture in shallow buried compound goaf was good, which provided an important theoretical basis for the prevention and control of residual coal spontaneous combustion.
| [1] |
史全林. 防治煤炭自燃的胶体泡沫理论及特性研究[D]. 徐州:中国矿业大学,2019.
SHI Quanlin. Study on the theory and properties of colloidal foam for controlling and preventing coal spontaneous combustion[D]. Xuzhou:China University of Mining and Technology,2019.
|
| [2] |
张福成. 浅埋易自燃煤层防灭火关键技术[J]. 煤矿安全,2011,42(2):35−38.
ZHANG Fucheng. The key technology of fire prevention and extinguishing in shallow buried coal seam prone to spontaneous combustion[J]. Safety in Coal Mines,2011,42(2):35−38.
|
| [3] |
LIANG Y T,ZHANG J,REN T,et al. Application of ventilation simulation to spontaneous combustion control in underground coal mine:A case study from Bulianta colliery[J]. International Journal of Mining Science and Technology,2018,28(2):231−242. doi: 10.1016/j.ijmst.2017.12.005
|
| [4] |
ZHUO H,QIN B T,SHI Q L,et al. Development law of air leakage fractures in shallow coal seams:A case study in the Shendong Coalfield of China[J]. Environmental Earth Sciences,2018,77(23):772. doi: 10.1007/s12665-018-7961-x
|
| [5] |
LI J W,LIU C Y. Spatio-temporal distribution and gas conductivity of overburden fissures in the mining of shallow thick coal seams[J]. European Journal of Environmental and Civil Engineering,2019,23(8):1019−1033. doi: 10.1080/19648189.2017.1327896
|
| [6] |
QIN B T,WANG H T,YANG J Z,et al. Large-area goaf fires:A numerical method for locating high-temperature zones and assessing the effect of liquid nitrogen fire control[J]. Environmental Earth Sciences,2016,75(21):1396. doi: 10.1007/s12665-016-6173-5
|
| [7] |
ZHANG J,AN J Y,WEN Z H,et al. Numerical investigation of coal self-heating in longwall goaf considering airflow leakage from mining induced crack[J]. Process Safety and Environmental Protection,2020,134:353−370. doi: 10.1016/j.psep.2019.12.025
|
| [8] |
文虎,于志金,翟小伟,等. 叠加开采下浅埋煤层裂隙演化与连通特征[J]. 煤矿安全,2015,46(12):46−49,53.
WEN Hu,YU Zhijin,ZHAI Xiaowei,et al. Crack development and interconnected characteristics of closely spaced shallow coal seams under overlapping mining[J]. Safety in Coal Mines,2015,46(12):46−49,53.
|
| [9] |
吴群英,郭重威,翟鸿良,等. 重复采动覆岩裂隙率空间分布相似模拟研究:以陕北矿区为例[J]. 煤炭科学技术,2022,50(1):105−111. doi: 10.3969/j.issn.0253-2336.2022.1.mtkxjs202201009
WU Qunying,GUO Zhongwei,ZHAI Hongliang,et al. Physical simulation on spatial distribution of void fraction in overburden due to repeated mining in North Shaanxi Mining Area[J]. Coal Science and Technology,2022,50(1):105−111. doi: 10.3969/j.issn.0253-2336.2022.1.mtkxjs202201009
|
| [10] |
谢和平,于广明,杨伦,等. 采动岩体分形裂隙网络研究[J]. 岩石力学与工程学报,1999,18(2):147−151. doi: 10.3321/j.issn:1000-6915.1999.02.007
XIE Heping,YU Guangming,YANG Lun,et al. Research on the fractal effects of crack network in overburden rock stratum[J]. Chinese Journal of Rock Mechanics and Engineering,1999,18(2):147−151. doi: 10.3321/j.issn:1000-6915.1999.02.007
|
| [11] |
李宏艳,王维华,齐庆新,等. 基于分形理论的采动裂隙时空演化规律研究[J]. 煤炭学报,2014,39(6):1023−1030.
LI Hongyan,WANG Weihua,QI Qingxin,et al. Study on fissure development rule of overlying strata influenced by mining based on fractal theory[J]. Journal of China Coal Society,2014,39(6):1023−1030.
|
| [12] |
赵毅鑫,令春伟,刘斌,等. 浅埋超大采高工作面覆岩裂隙演化及能量耗散规律研究[J]. 采矿与安全工程学报,2021,38(1):9−18,30.
ZHAO Yixin,LING Chunwei,LIU Bin,et al. Fracture evolution and energy dissipation of overlying strata in shallow-buried underground mining with ultra-high working face[J]. Journal of Mining & Safety Engineering,2021,38(1):9−18,30.
|
| [13] |
范钢伟,张东升,马立强. 神东矿区浅埋煤层开采覆岩移动与裂隙分布特征[J]. 中国矿业大学学报,2011,40(2):196−201.
FAN Gangwei,ZHANG Dongsheng,MA Liqiang. Overburden movement and fracture distribution induced by longwall mining of the shallow coal seam in the Shendong coalfield[J]. Journal of China University of Mining & Technology,2011,40(2):196−201.
|
| [14] |
胡永忠,刘长郄,刘长友,等. 煤层群混合开采采动裂隙发育规律研究[J]. 采矿与安全工程学报,2015,32(3):396−400.
HU Yongzhong,LIU Changqie,LIU Changyou,et al. Development regularity of mining-induced fractures in mixed mining of coal seam group[J]. Journal of Mining & Safety Engineering,2015,32(3):396−400.
|
| [15] |
黄庆享. 浅埋煤层长壁开采岩层控制[M]. 北京:科学出版社,2018.
|
| [16] |
范立民,马雄德,李永红,等. 西部高强度采煤区矿山地质灾害现状与防控技术[J]. 煤炭学报,2017,42(2):276−285.
FAN Limin,MA Xiongde,LI Yonghong,et al. Geological disasters and control technology in high intensity mining area of western China[J]. Journal of China Coal Society,2017,42(2):276−285.
|
| [17] |
姚邦华,周海峰,陈龙. 重复采动下覆岩裂隙发育规律模拟研究[J]. 采矿与安全工程学报,2010,27(3):443−446. doi: 10.3969/j.issn.1673-3363.2010.03.029
YAO Banghua,ZHOU Haifeng,CHEN Long. Numerical simulation about fracture development in overlying rocks under repeated mining[J]. Journal of Mining & Safety Engineering,2010,27(3):443−446. doi: 10.3969/j.issn.1673-3363.2010.03.029
|
| [18] |
栗东平,周宏伟,薛东杰,等. 煤岩体采动裂隙网络的逾渗与分形特征关系研究[J]. 岩土力学,2015,36(4):1135−1140.
LI Dongping,ZHOU Hongwei,XUE Dongjie,et al. Relationship between percolation and fractal properties of mining-induced crack network in coal and rock masses[J]. Rock and Soil Mechanics,2015,36(4):1135−1140.
|
| [19] |
潘瑞凯,曹树刚,李勇,等. 浅埋近距离双厚煤层开采覆岩裂隙发育规律[J]. 煤炭学报,2018,43(8):2261−2268.
PAN Ruikai,CAO Shugang,LI Yong,et al. Development of overburden fractures for shallow double thick seams mining[J]. Journal of China Coal Society,2018,43(8):2261−2268.
|
| [20] |
钱鸣高,石平五,许家林. 矿山压力与岩层控制[M]. 2版. 徐州:中国矿业大学出版社,2010.
|
| [21] |
张桐桐. 浅埋煤层群下位薄煤层开采覆岩运动规律及矿压控制技术研究[D]. 徐州:中国矿业大学,2022.
ZHANG Tongtong. Research on movement law of overlying rock and mine pressure control technology in lower thin coal seam mining of shallow coal seam group[D]. Xuzhou:China University of Mining and Technology,2022.
|
| [22] |
梁冰,汪北方,姜利国,等. 浅埋采空区垮落岩体碎胀特性研究[J]. 中国矿业大学学报,2016,45(3):475−482.
LIANG Bing,WANG Beifang,JIANG Liguo,et al. Broken expand properties of caving rock in shallow buried goaf[J]. Journal of China University of Mining & Technology,2016,45(3):475−482.
|
| [23] |
汪北方,梁冰,王俊光,等. 煤矿地下水库岩体碎胀特性试验研究[J]. 岩土力学,2018,39(11):4086−4092,4101.
WANG Beifang,LIANG Bing,WANG Junguang,et al. Experiment study on rock bulking of coal mine underground reservoir[J]. Rock and Soil Mechanics,2018,39(11):4086−4092,4101.
|
Supported by: Beijing Renhe Information Technology Co., Ltd. 
DownLoad: