陕北窄条带采空区遗留的大量煤柱，这些煤柱不仅浪费煤炭资源（矿井回采率只有30%左右），随着时间的推移也将会引发煤层自燃、矿震等一系列灾害。近年来随着煤炭行情的回暖，部分煤矿资源枯竭，采空区遗留煤柱回收提上日程。本文针对常兴煤矿计划实施的条带空区复采项目，从技术和经济两方面论证其复采的可行性。

在对常兴煤矿地质和采空区现状分析的基础上，利用有效面积法计算3107工作面采空区煤柱载荷为6.99MPa，采用实体煤单轴抗压强度计算煤柱稳定性系数为1.93，预估煤柱处于稳定状态；以榆阳区14个矿井条带空区为样本，通过BP神经网络训练出适应于榆阳区煤矿条带采空区稳定性评价模型，对常兴煤矿3107工作面评价，结果为采空区稳定。通过对3107工作面采空区煤样进行实验室力学实验，得到煤柱试件平均单轴抗压强度11.09MPa，弹性模量884.8MPa，泊松比0.25，单轴抗拉强度1.084MPa；运用霍克-布朗破坏准则对力学实验结果进行换算，得到采空区原位条带煤柱强度值最小值为10.52MPa，煤柱稳定系数为1.51，进一步验证采空区煤柱仍处于稳定状态。通过对承载体载荷分析，选择所受载荷较大的方案一，作为数值模拟研究对象，基于此将充填复采工艺设计为前进式采空区充填阶段、后退式偶数条带采充阶段和后退式奇数采充阶段；FLAC^3D对充填复采过程进行数值模拟研究表明，方案一在整个充填复采过程中，承载体所受载荷均小于其极限抗压强度，承载体及采场处于稳定状态。经济分析研究表明方案一和方案二经济上均可行，财务分析表明方案一比方案二投资回收期更短，盈利能力更强，最终选择方案一作为常兴煤矿条带空区充填复采方案。

研究结果表明常兴煤矿充填复采过程中承载体和采场处于安全稳定状态，项目投资风险较小、投资回收期短、内部收益率高，具有良好的盈利能力。综合表明，常兴煤矿条带空区充填复采项目可行，也可为同类条件矿井提供参考。

There are a lot of coal pillars left in the narrow strip goaf in Northern Shaanxi. These pillars not only waste coal resources (the recovery rate of the mine is only about 30%), but also may lead to a series of disasters such as spontaneous combustion of coal seam and mine earthquake over time. In recent years, with the recovery of coal market and the exhaustion of some coal resources, the recovery of remaining coal pillars in goaf has been put on the agenda. In this paper, the feasibility of strip mined area recovery project in Changxing coal mine is demonstrated from two aspects of technology and economy.

Based on the analysis of the geology and the current situation of the goaf in Changxing coal mine, the effective area method is used to calculate the coal pillar load in the goaf is 6.99MPa, and the solid coal uniaxial compressive strength is used to calculate the coal pillar stability coefficient is 1.93, which show the coal pillars are in a stable state. Taking 14 coal mines strip empty areas in Yuyang as samples, the stability evaluation model adapted to Yuyang District coal mine strip goaf was trained by BP neural network. Based on the evaluation model, , and the result that the 3107 working face goaf of Changxing coal mine is evaluated is stable. Through laboratory mechanical experiment of the coal sample in the goaf of 3107 working face, the average uniaxial compressive strength, modulus of elasticity, Poisson's ratio and uniaxial tensile strength of the coal pillar are 11.09MPa, 884.8MPa, 0.25 and 1.084MPa respectively. The mechanical experiment results are converted by the Hawke Brown failure criterion, and the minimum value of the in-situ strip coal pillar strength in the goaf is 10.52MPa and the stability coefficient of the coal pillar is 1.51, which further verifies that the goaf coal pillar is still in a stable state. Through the analysis of the load on the bearing body, the first scheme with large load is selected as the research object of numerical simulation. Based on this, the filling and recovery mining process is designed as the filling stage of the forward goaf, the even strip mining and filling stage of the backward type and the odd mining and filling stage of the backward type. The FLAC^3D numerical simulation study on the filling and recovery mining process shows that the load on the support is less than its ultimate compressive strength during the entire filling repeated mining process, the bearing body and stope are in a stable state. The economic analysis shows that scheme I and scheme II are economically feasible, and the financial analysis shows that scheme I has a shorter payback period and stronger profitability than scheme II. Finally, scheme I is selected as the stoping scheme of Changxing coal mine.

The research results show that the bearing body and stope are in a safe and stable state during the process of filling and mining in Changxing coal mine.The project has low investment risk, short investment recovery period, high internal rate of return and good profitability. Therefore, the Changxing coal mine strip empty area filling recovery mining project is feasible, and can also provide a reference for mines with similar conditions.