河南理工大学学报（自然科学版）2024，Vol.43Issue(3)：50-59,10.DOI:10.16186/j.cnki.1673-9787.2023060054
浅埋煤层开采覆岩"梯形"破断参数与裂隙演化分析
Analysis of"trapezoid"fracture parameters and fracture evolution of overburden in shallow coal seam mining
摘要
Abstract
Objectives Objectives In order to explore the correlation mechanism between the"trapezoidal"frac-ture 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.The overlying rock caving presents an"asym-metric oblique four-sided"type.Results The research results show that the overlying strata,affected by the dis-turbance of coal seam mining,presents a"trapezoidal"shape along the fracture line on both sides.Due to the φ and γ difference of fracture angles,the mining fracture of overlying rock presents an"asymmetric oblique four-sided"type fracture development body distribution shape in space.Conclusions Based on theoretical calcula-tions,it is concluded that the caving distribution pattern of overlying rock is studied on the working face of Yay-aomao 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 Lφj=11.5 m,Lγj=10.4 m.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 11～30 m,and the best width of the fissure development is within 5 m from the working face cutting eye and coal mining machine head.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Key words
shallow buried coal seam/breaking parameter/overburden caving/numerical simulation/simulation of similarity/field measurement分类
矿业与冶金引用本文复制引用
王朋,李瑞,程志恒,孔德中,陈昊熠,张宏图..浅埋煤层开采覆岩"梯形"破断参数与裂隙演化分析[J].河南理工大学学报（自然科学版）,2024,43(3):50-59,10.基金项目
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) （GJNY-20-113-17）
国家自然科学基金资助项目(52074120) （52074120）
