近距離煤層群重復(fù)采動覆巖裂隙演化特征研究

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中圖分類號：TD325 文獻(xiàn)標(biāo)志碼：A 文章編號：1672-1098（2025）02-0076-10

引文格式：，等.近距離煤層群重復(fù)采動覆巖裂隙演化特征研究[J].安徽理工大學(xué)學(xué)報（自然科學(xué)版），2025，45（2） ：76-85.

Fracture Evolution Characteristics of Repeated Mining Overlying Strata in Close-Distance Coal Seam Groups CHENG Xiang1，34，ZHOU Jiang'， WANG Song2， WANG Anhong?

（1.StateKeyLaboratoryofDigitalIntellgentTchologyforUnmanedCoalMining，Anhui UniversityofSienceandTechology， Huainan Anhui232Oo1，China；2.ScholofMining Engineering，AnhuiUniversityofScienceandTechnology，HuainanAnhui 232001，China；3.MiningengineeringPost-DoctoralFlowStation，Anhui UniversityofScienceand Technology，HuainanAnui 232001，China;4.Postdoctoral Research Workstationof Huainan Mining（Group）Co.，Ltd.，Huainan Anhui232Ool，China）

Abstract：Objective To investigate the fracture evolution of overlying strataand the development characteristics of "two zones"（caving and fractured zones） under repeated mining in close-distance coal seams.Methods Similarity simulation，numerical simulation and theoretical analysis were conducted based on the 72 and 82 working faces in the 83 Lower Mining Area of Xutuan Coal Mine.The fracture migration and crack evolution of overlying rock under repeated mining of 72 and 82 coal seams were analyzed. Results After mining the 82 coal seam，the caving and fractured zones reached the heights of 22.5m and 86m respectively. Under repeated mining，the periodic weighting interval decreased significantly，the subsidence curves exhibited fluctuations，and the maximum subsidence occurred near the goaf center，showing a "large-middle，small-sides" distribution.Theoretical calculations using a double Σ- seam comprehensive mining thickness model yielded caving and fractured zone heights of 16.81～ 26.23m and 71.78＼～92.62m respectively.The numerical simulation revealed that the mining-induced fractures in the 82 coal penetrated the 72 goaf，with a larger fracture range and lateral distribution. Conclusion The research clarifies fracture distribution paterns under repeated mining in close-distance coal seams，providing insights for water and gas hazard prevention in mines.

Key words：closed distance seam group;crack evolution； similar simulation ;repeated mining；"two zones" height

煤炭通常是以煤層群的形式賦存，多煤層開采時會引起上覆巖層的變形和破斷以及采動形成的裂隙網(wǎng)絡(luò)范圍，裂隙發(fā)育程度較單煤層采動更明顯、復(fù)雜。（剩余8940字）