Estimation and Its Development Restrictions of Multiple Coal Seam Overburden Resource Quantity in Tongchuan Mining Area

To address the issue of coal resource overburden in urban fringe areas, takes a section of the Shunjin Industrial Park in Tongchuan City as an example, constructs an integrated analysis framework of "resource estimation-development restriction identification-technical recoverability assessment", and systematically studies the characteristics of multi-seam overburden and its coordinated development path. Based on drilling data and overburden maps, the resource estimation of coal seams No. 5-2, No. 10, and No. 11 is conducted using the moving angle method and equal thickness slicing method. The total overburden amount is 1 225 700 tons, of which the controlled resource amount accounts for 35.1%. The development restriction coefficient model is used to quantify the coupling intensity of urban land overburden, and the non-recoverable cause classification model is introduced to identify three main controlling factors: buried depth exceeding limits, structural damage, and statutory protection. A recoverability enhancement coefficient model is established to assess the technical recovery potential of different coal seams. The results show that coal seam No. 11 has the highest potential for tapping, with a R_o value of 0.109 7, and FLAC^3D verifies that its structural stability meets the requirements for local recovery. The research findings can provide methodological support and decision-making basis for resource overburden identification, coordinated mining, and land use optimization in urban fringe areas.