Quantitative Characterization of Overburden Rock Development Pattern in the Goaf at Different Key Stratum Locations Based on DEM
Quantitative Characterization of Overburden Rock Development Pattern in the Goaf at Different Key Stratum Locations Based on DEM
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基于DEM的不同关键层位采空区覆岩发育规律定量表征
DOI：
10.1155/2021/8011350
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发表时间：
2021-12
影响因子：
1.8
通讯作者：
Yuanfan Ji
中科院分区：
文献类型：
--
作者：
Xiaoqiang Zhang;Bolin Hu;Jiaxing Zou;Chu;ong Liu;Yuanfan Ji
覆岩采动裂隙是采空区漏风引起煤炭自燃、瓦斯积聚和矿井突水的主要原因。快速、准确地确定采动裂隙的发育演化规律，对于煤炭自燃防治、瓦斯灾害防治、水害防治措施的应用具有重要意义。本文在理论分析的基础上对导水裂隙带的发育高度进行了初步判断，并根据其判断结果确定了数值模拟的物理模型尺寸。判断其导水裂隙带发育高度在49 ~ 64.2m之间，与实际结果相符。在此基础上，利用PFC软件建立三维实体模型，模拟煤层开采过程，分析了煤层主关键层处于不同位置时覆岩裂隙发育规律及导水裂隙带发育高度。结果表明：当主关键层位于“原裂隙带边界”时，导水裂隙带发育受到显著抑制;当主关键层位于“原冒落带”时，导水裂隙带充分发育，裂隙带最终发育至模型顶部。为了验证数值模拟的准确性，在相同方案下进行了相似材料模拟实验。计算结果与数值模拟结论一致，有效验证了数值模拟的准确性。最后，基于数值模拟对采空区进行孔隙度提取，并对采空区进行渗透性分区;结果表明，导水裂隙带的发育对矿区渗透性有显著影响，裂隙越发育，其渗透性越大。本文通过多种研究层位探索不同关键层位下采空区裂隙发育规律，结果表现出较好的一致性，为矿井突水、煤与瓦斯突出等灾害的防治提供了科学依据，为安全开采提供了理论指导。
The overburden rock mining fissures are the main cause of coal spontaneous combustion, gas pooling, and mine water inrush caused by goaf air leakage. Rapid and accurate determination of the development and evolution law of mining fissures have great significance for the application of coal spontaneous combustion prevention and control, gas disaster prevention and control, and water damage prevention and control measures. In this paper, a preliminary judgment of the development height of the water-conducting fracture zone is made based on the theoretical analysis, and the physical model size of the numerical simulation is determined according to its judgment result. It is judged that the development height of its water-conducting fracture zone is between 49 and 64.2 m, which is in line with the actual results. Based on this, a three-dimensional solid model was established in PFC (Particle Flow Code) software to analyze the fissure development pattern of the overburden rock and the development height of the water-conducting fracture zone when the main key stratum of the rock seam is in different positions by simulating the excavation process of the coal seam. The results show that when the main key stratum is located in the “original crack belt boundary,” the development of water-conducting fracture zone is significantly inhibited; when the main key stratum is located in the “original caving zone,” the water-conducting fracture zone is fully developed, and the crack belt finally develops to the top of the model. In order to verify the accuracy of the numerical simulation, similar material simulation experiments were performed under the same scheme. The results are consistent with the numerical simulation conclusions, effectively verifying the accuracy of the numerical simulation. Finally, the extraction of porosity of the goaf was carried out based on numerical simulation, and the permeability zoning of the goaf was performed; the results show that the development of the water-conducting fracture zone has a significant influence on the permeability of the mining area, and the more fully developed the fissure is, the greater is its permeability. In this paper, the fissure development law in the goaf under different key stratums is explored by various research stratums, and the results show a good consistency, which provides a scientific basis for the prevention and control of disasters such as water inrush and coal and gas outburst in mines, and provides theoretical guidance for safe mining.
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DOI：
--
发表时间：
2008
期刊：
Chinese journal of rock mechanics and engineering
影响因子：
--
作者：
Liu Shuchen
通讯作者：
Liu Shuchen
DOI：
--
发表时间：
2012
期刊：
Journal of China Coal Society
影响因子：
--
作者：
Wang Xiao-zhen
通讯作者：
Wang Xiao-zhen
采空区瓦斯运移采动裂缝网络数值模拟
DOI：
10.1016/j.ijmst.2017.05.015
发表时间：
2017-07-01
影响因子：
11.8
作者：
Cao Jie;Li Wenpu
通讯作者：
Li Wenpu
DOI：
10.3868/s070-001-012-0014-4
发表时间：
2012-04-01
影响因子：
6.4
作者：
Wang, John;Jin, Peng;Li, Fuzhi
通讯作者：
Li, Fuzhi
采矿影响下采空区覆岩裂隙演化规律及瓦斯涌出
影响因子：
1.7
作者：
Cheng, Cheng;Cheng, Xiaoyu;Liu, Chao
通讯作者：
Liu, Chao