双巷布置工作面外围巷道冲击地压启动机理

Rock burst start-up mechanism of peripheral roadway in double entry layout workface

以山西某高瓦斯双巷布置工作面外围巷道冲击地压案例为研究背景,采用理论分析、现场实测等方法,建立了侧向采空区顶板断裂诱发时滞性冲击启动力学模型,揭示了冲击启动原理,并发现了褶曲导致动载型冲击地压发生的案例。结果表明:工作面开采后,外U留巷煤柱因采空区顶板侧向回转,产生偏移的弹性核;进风平巷通过背斜轴部带,因水平构造应力导致顶板垮断极度滞后,其断裂产生的动载源加载并扰动煤柱弹性核静载致其突破极限诱发时滞性冲击启动;静载荷积聚的弹性核在外U留巷煤柱中普遍存在,不足以诱发静载荷型冲击,背斜轴部顶板滞后垮断提供了动载荷源,因此判断其冲击类型为集中动载荷型,后期防治应针对动、静载荷源同时采取解危措施。

Taking a gassy coal mine rock burst case as the research background, using the theoretical analysis, field measurement to study on rock burst start-up mechanism of peripheral roadway in double entry layout workface, the results show that： the bias elastic core region produced in the wide coal pillar of gob-side entry retaining is because the side roof lateral rotation which Subsequently breaks off from goal. The elastic core region is gradually away from the goal side to the roadside of gob-side entry re- taining. Because of the horizontal tectonic stress, that leads to roof caving extreme lagging. In the anti- clinal axis area of intake airflow roadway, the dynamic load source from roof caving gives a load and disturbs to the coal pillar elastic core region causing the limit break. The rock burst with hysteresis qual- ity occurred. The anticlinal axis provides dynamic load ized dynamic loads. The research results could provide loads and static loads source at the same time. source, so it leads to a rock burst under central- measures to prevent rock burst for the dynamic loads and static loads source at the same time.