1. College of Geoscience and Surveying Engineering,China University of Mining and Technology ( Beijing),Beijing　 100083,China; 2. School of Resources and Environmental Science,Shijiazhuang University,Shijiazhuang　 050035,China

煤柱稳定性评价是房柱式开采设计的主要研究内容之一。在分析煤柱强度、煤柱载荷和从属面积法煤柱稳定性评价的基础上,定义了煤柱有效宽度为煤柱横截面内最大内切圆直径,引入采动载荷转移距离LTD,建立了基于载荷转移距离和煤柱有效宽度的煤柱稳定性评价方法。通过对规则煤柱和不规则煤柱稳定性的对比分析,表明新方法能有效改进传统从属面积法评价煤柱稳定性的局限性。为验证基于载荷转移距离和有效宽度的煤柱稳定性评价方法的可靠性,采用3DEC数值方法进行了模拟分析,模拟计算的煤柱载荷分布规律与理论计算一致,相对误差多在10%以下,最大相对误差为12.68%,验证了基于载荷转移距离的煤柱载荷计算的合理性。表明新方法不仅适用于规则煤柱,也适用于不规则煤柱,具有较好的普适性。

Pillar stability evaluation is a major content and premise for room and pillar mining design. On the basis of analysis of pillar strength,pillar load and stability evaluation with tributary area method,the effective width is defined as the maximum diameter of inscribed circle in the coal pillar and is used to calculate the pillar strength. By leading into the load transfer distance ( LTD) ,the pillar stability evaluation method is established based on the LTD and effi- cient width. Compared with the results of stability evaluation for regular and irregular pillars,the new method can ef- fectively improve the limitation of traditional stability evaluation for tributary area method. In order to verify the relia- bility of new pillar stability evaluation method based on the load transfer distance and the effective width,the 3DEC numerical simulation is applied and analyzed. The distribution of numerical simulated pillar loads are consistent with theoretical calculations,almost all the relative errors are below 10% and the maximum relative error is 12. 68% . That is to say that the new evaluation method has a good universality not only suitable for regular pillars but also for irregular pillars.

CUI Ximin,LU Ying,ZHANG Bing. Pillar stability evaluation based on load transfer distance and pillar effective width[J]. Journal of Chi- na Coal Society,2017,42(11):2792-2798.