综放沿空巷道不对称破坏特征及其原因分析

随着我国综放条带式开采的推广,留煤柱护巷的沿空留巷技术成为主要布置方式之一,但是也出现了矿压的不对称显现等新的围岩控制问题。在深入调研统计的基础上,详细阐述了宽煤柱护巷和窄煤柱护巷条件下,综放沿空留巷的变形破坏时间和特征,并进一步分析两种情况下的变形破坏原因。宽煤柱护巷不对称变形破坏原因为煤柱宽度留设不足和垂直应力的非对称分布,窄煤柱护巷不对称变形破坏的原因为采动影响形成的水平应力和侧向支承压力的分布不均。

Asymmetric failure characteristics of gob side entry in fully mechanized top coal caving face and its reasons

With the popularization of strip mining in fully mechanized top coal caving in China,gob side entry retaining technology of retaining coal pillar has become one of the main layout methods.However,some new surrounding rock control problems such as asymmetric behavior of ground pressure appear.On the basis of in-depth investigation and statistics,the deformation and failure time and characteristics of gob side entry retaining in fully mechanized top coal caving face under the conditions of wide coal pillar and narrow coal pillar roadway protection were elaborated in detail,and the causes of deformation and failure under the two conditions were further analyzed.The causes of asymmetric deformation and failure of wide coal pillar roadway protection were insufficient coal pillar width and asymmetric distribution of vertical stress;the causes of asymmetric deformation and failure of narrow coal pillar roadway protection were uneven distribution of horizontal stress and lateral abutment pressure caused by mining.