王朋，李瑞，程志恒,等. 浅埋煤层开采覆岩“梯形”破断参数及裂隙演化分析[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2023060054

WANG P,LI R,CHENG Z H,et al．Analysis of "trapezoid" fracture parameters and fracture evolution of overburden in shallow coal seam mining[J].Journal of Henan Polytechnic University( Natural Science)，doi:10.16186/j.cnki.1673-9787.2023060054

浅埋煤层开采覆岩“梯形”破断参数及裂隙演化分析(网络首发)

王朋¹，李瑞^2,3，程志恒^4,5，孔德中¹，陈昊熠⁶，张宏图⁷

（1.贵州大学 矿业学院，贵州 贵阳 550025；2.神木市能源局，陕西 神木 719300；3.中国矿业大学(北京) 能源与矿业学院，北京 100083；4.华北科技学院 矿山安全学院，北京 10160；5.煤炭开采水资源保护与利用国家重点实验室，北京 102209；6.北京科技大学 土木与资源工程学院，北京 100083；7.河南理工大学 安全科学与工程学院,，河南 焦作 454000）

摘要:目的 为了探究浅埋煤层开采覆岩“梯形”破断参数及裂隙演化规律之间的关联机制，并量化表征覆岩垮落、裂隙分布特征，方法 以崖窑峁煤矿为研究对象，采用理论分析、物理相似模拟、数值模拟、现场实测相结合的研究手段，分析了覆岩垮落空间分布形态并量化表征了上覆岩层垮落“梯形”的分布参数，得出了上覆岩层垮落后呈现“非对称斜四边”型，结果 结果表明：上覆岩层受煤层开采的扰动影响，沿两侧破断线整体呈现“梯形”形态，由于破断角φ，γ不同，故覆岩采动裂隙在空间上呈现“非对称斜四边”型裂隙发育体的展布形态，结论 基于理论计算得出崖窑峁矿业30204工作面研究覆岩垮落分布形态，覆岩垮落两侧破断角开切眼处破断角φ∈[58.7°,68.7°)，采煤机机头处破断角γ∈(60.8°,67.8°]，并根据破断角公式进一步计算得出了开切眼处覆岩垮落长度L_γj=11.5m;采煤机机头处覆岩垮落长度L_φj=10.4m。依据现场实测，30204工作面3-1煤层顶板垮落监测数据得出了上覆岩层垮落的最佳高度，为11~30 m，裂隙发育最佳宽度在距离工作面开切巷5 m及采煤机机头5 m范围内。

关键词:浅埋煤层；破断参数；覆岩垮落；数值模拟；相似模拟；现场实测

中图分类号:TD823

doi:10.16186/j.cnki.1673-9787.2023060054

基金项目: 国家自然科学基金资助项目（52074120）；煤炭开采水资源保护与利用国家重点实验室开放基金资助项目（GJNY-20-113-17）

收稿日期：2023/06/27

修回日期：2023/09/22

网络首发日期：2024/01/02

Analysis of "trapezoid" fracture parameters and fracture evolution of overburden in shallow coal seam mining

WANG Peng¹,LI Rui^2,3,CHENG Zhiheng^4,5,KONG Dezhong¹,CHEN Haoyi⁶,ZHANG Hongtu⁷

(1.College of Mining, Guizhou University, Guiyang 550025;2.Shenmu City Energy Bureau，Shenmu 719300;3.School of Energy and Mining,China University of Mining and Technology-Beijing，Beijing 100083 China;4. School of Safety Engineering，North China Institute of Science and Technology，Beijing 101601,China；5.State Key Laboratory of Water Resource Protection and Utilization in Coal Mining ,Beijing 102209, China;6.School of Civil and Resources Engineering，University of Science and Technology Beijing，Beijing 100083,China;7.School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China)

Abstract:Objective In order to explore the correlation mechanism between the "trapezoidal" fracture parameters and fracture evolution law of overburden mining in shallow coal seam, and quantify the distribution characteristics of overburden caving and fracture,Methods Taking Yayaomao Coal Mine as the research object, this paper analyzes the spatial distribution pattern of overlying rock caving and quantitatively characterizes the distribution parameters of the "trapezoid" of overlying rock caving by means of theoretical analysis, physical similarity simulation, numerical simulation and field measurement, and concludes that the overlying rock caving presents an "asymmetric oblique four-sided" type.Ｒesults The research results show that the overlying strata, affected by the disturbance of coal seam mining, presents a "trapezoidal" shape along the fracture line on both sides. Due to the φ and γ difference of fracture Angle and fracture Angle, the mining fracture of overlying rock presents an "asymmetric oblique four-sided" type fracture development body distribution shape in space.Conclusion Based on theoretical calculation. it is concluded that the caving distribution pattern of overlying rock is studied on the working face of Yayaomao Mining Industry 30204. It is concluded that the fracture Angle at the opening hole on both sides of the caving rock is φ∈[58.7°,68.7°], and the fracture Angle at the shearer head is γ ∈(60.8°,67.8°). The overburden collapse length was further calculated based on the angle of rupture equation L_γj =11.5m, L_φj =10.4m.According to the on-site measurement, 30204 working face 3^-1 coal seam roof collapse monitoring data concluded that the best height of the overlying rock collapse in 11m~30m, the best width of the fissure development in the distance from the working face cutting eye 5m and coal mining machine head 5m within the range.

Key words:Shallow buried coal seam;Breaking parameter;Numerical simulation; Simulation of similarity;Field measurement

CLC:TD823

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