CAJ | 학술논문

采用散体充填法的矿山，由于充填体无法直接暴露，阶段矿柱回采临界厚度的保留成为残矿回收的突出难题。基于传统弹性梁理论，结合实际情况，将阶段矿柱简化为均布载荷下两端固定的弹性梁力学模型，推导了其弹性应力解，揭示了xs是阶段矿柱上采过程的第1破坏应力。理论分析表明：影响矿柱上采顶板临界厚度的主要因素为：散体载荷、回采跨度和岩体抗拉强度。利用FLAC3D完成了多因素组合影响阶段矿柱上采过程数值模拟正交试验，分析了单一影响因素与顶板临界厚度的关系，利用多元非线性回归的数学方法，建立了上采过程三因素组合影响下阶段矿柱临界厚度数学预测公式。最终，实现了散体介质下阶段矿柱上采临界厚度的预测。结合凤凰山铜矿-240 m阶段矿柱回采实际，表明了该预测公式的适用性。
채용산체충전법적광산，유우충전체무법직접폭로，계단광주회채림계후도적보류성위잔광회수적돌출난제。기우전통탄성량이론，결합실제정황，장계단광주간화위균포재하하량단고정적탄성량역학모형，추도료기탄성응력해，게시료xs시계단광주상채과정적제1파배응력。이론분석표명：영향광주상채정판림계후도적주요인소위：산체재하、회채과도화암체항랍강도。이용FLAC3D완성료다인소조합영향계단광주상채과정수치모의정교시험，분석료단일영향인소여정판림계후도적관계，이용다원비선성회귀적수학방법，건립료상채과정삼인소조합영향하계단광주림계후도수학예측공식。최종，실현료산체개질하계단광주상채림계후도적예측。결합봉황산동광-240 m계단광주회채실제，표명료해예측공식적괄용성。
For level pillar stoping under loose medium, determining the critical thickness of roof is difficult. In order to solve the problem, using elastic beam theory, the level pillar is simplified as a mechanical model of a beam fixed at both ends under uniform load;and xs is considered to be the main failure stress according to the elastic stress solution of beam. Theoretical analysis shows:in level pillar stoping process, the main influence factors of critical thickness of roof is loose medium load, stoping span and tensile strength of rocks. Through using FLAC3D and combining with orthogonal experiment result of numerical simulation, the relationship between single influence factor and critical thickness of roof is revealed. Based on multiple nonlinear regression analysis method, the mathematical forecasting formula of critical thickness of roof under multifactor influence is established. Finally, The critical thickness of the roof is predicted accurately;and applicability of the mathematical forecasting formula is verified by the engineering practice of level pillar stoping in Fenghuangshan Mine.