错层位巷道布置条件下端部顶煤的破坏特点分析

 摘要：通过对错层位巷道布置和传统放顶煤开采条件下上覆岩层运移规律的分析，认为在新技术条件下由于三角煤柱对顶板无支撑作用，在出现了接续工作面以后上覆岩层的破断垮落是连续的，导致发挥作用的关键层位置提高；结合格里菲斯强度理论分析认为，关键层位置的提高将对顶煤冒放性起积极作用，通过相似模拟实验和计算机测点扫描数据分析，发现在出现接续工作面之后关键层的位置由22m处上升至35m处。随着接续工作面的不断增加，关键层破段跨距不断增加，导致关键层不断破断，从而发挥作用的关键层位置不断上升，因而端面顶煤将承担更多覆岩的压力；认为理论分析基本符合实际情况，最终得出新技术条件下工作面端部支承压力随着接续工作面的增多而相对增大，从而有利于顶煤冒落的结论。

Analysis on Failure Features of Top Coal at Face End under Layout of Dislocated Seam Gateway

With the analysis on the overburden strata migration law under the conventional top coal caving mining and the layout of the dislocated seam gateway,the paper held that due to the delta coal pillar had no support function to the roof under the new technology condition,after the continued mining face appeared,the breaking and falling of the above strata were continued,which could cause the key functional layer location raised upward.In combination with the analysis of Griffith's strength theory,the paper hel...