Determination on Reasonable Malposition of Combined Mining in Close-Distance Coal Seams

摘要： 为避免近距离煤层联合开采条件下上煤层工作面回采过程中顶板周期来压波及下煤层工作面或上下煤层同步来压而相互影响，通过现有矿压及弹性半无限体理论的运用并结合现场实测数据分析给出石圪节煤矿联采条件下工作面合理错距的选取方法。研究表明：1）据煤矿地质及煤岩物理力学特性运用矿压理论初定工作面错距；2）结合理论或现场实测分析层间应力分布影响区域，修正工作面错距；3）现场实践最终确定合理错距。选取初定的工作面错距及层间应力主要影响区横向范围值之和作为近距离煤层合理错距，可避免下煤层煤体承受上煤层的连续高应力状态。

关键词: 联合开采, 近距离煤层, 工作面错距, 半无限体

Abstract: Under the condition of combined mining in close-distance coal seams in Shigejie coal mine，to avoid the influence of roof periodic weighting on the lower coal seam during the mining process of upper seam，or the interaction of synchronized weightings between the upper and lower seams，we gives the selective method of determining the reasonable malposition in combined mining in this paper，by using the theories of semi-infinite elastic and underground pressure，and the field measurement data．The results show that：1) firstly，the malposition distance can be determined initially according to the mine geology and physical mechanical properties；2) then，the malposition should be modified after the theoretical analysis or field measurement of stress distribution zone between layers；3) finally，the reasonable malposition is determined ultimately by the examination of the field practice．According to the analysis results，selecting the sum of initial malposition and horizontal range value of the main stress effect zone between layers as the reasonable malposition distance in close-distance coal seams，can make the lower seam avoid bearing the continuous high stress from the upper seam．

Key words: combined mining, close-distance coal seams, malposition distance, semi-infinite body