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针对综放工作面末采阶段支架回撤过程中容易出现压架的问题,建立了顶板断裂来压力学模型,并根据顶板断裂前后的平衡方程推导出顶板在不同断裂形式下支护体、煤体内应力增量平均值的统一表达式。以神东矿区多通道快速回撤技术模式为研究对象,根据顶板断裂面与主回撤通道的位置关系分两种情况进行了力学分析,结果表明:工作面回撤停采的合理位置应能够使主回撤通道处于顶板断裂面以外;回撤期间利用停采让压原理调节周期来压步距,采取在主撤巷道内加强支护、控制贯通前后工作面高差等措施,能有效保证综放工作面末采阶段的安全高效回撤。
In view of the problem that the pressure frame is easy to emerge during the final stage of the fully mechanized caving mining face, the pressure model of roof fracture is established. According to the balance equation before and after the roof fracture, Unified expression of the average value of in vivo stress increment. Taking the multi-channel quick withdrawal technology model in Shendong Mining Area as the research object, the mechanical analysis is carried out in two situations according to the position relationship between the fracture surface of the roof and the main withdrawal channel. The results show that: So that the main retracement channel is outside the roof fracture surface; during the retracement period, using the principle of stopping production and releasing pressure to adjust the cycle pressure step, and taking measures to strengthen support in the main tunnel and control the elevation of the working face before and after through the tunnel can effectively ensure Safe and efficient retraction of the last stage of fully mechanized caving face.