论文部分内容阅读
邢台煤矿七号煤层的顶板属于二级二类(Ⅱ_2),老顶来压明显,中等稳定。在下分层开采时,顶板是破碎的,属老顶来压较明显的Ⅱ级下、一类上顶板。该矿使用两套西德克罗克纳贝考瑞特公司生产的两柱掩护式支架。在这种顶板条件下,支架拆除搬迁时,顶板维护比较麻烦。自1980年6月份投产以来,已采过六个工作面,搬家倒面六次。各次搬家倒面所取得的主要经济技术指标见下表:
The roof of No.7 coal seam of Xingtai Coal Mine belongs to the second class (Ⅱ_2), the old top pressure is obvious and moderately stable. In the next stratified mining, the roof is broken, belong to the old roof to pressure more obvious under the level of Ⅱ, a class of roof. The mine uses two sets of two-post shielded stents manufactured by West Croccana Bayeritec. Under such roof conditions, the roof maintenance is troublesome when the support is removed for relocation. Since its operation in June 1980, it has adopted six face faces and moved the house six times. The main economic and technical indicators obtained during the move are as follows: