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为有效控制破碎覆岩回采巷道变形,根据其赋存特征采用“工”字钢架棚支护技术,分析破碎覆岩普氏拱结构的形成原理和研究回采巷道临界宽度。针对破碎覆岩回采巷道围岩松碎、强度低和不具有可锚性等特点,采用普氏拱理论,计算回采巷道围岩压力;当棚梁“工”字钢最大正应力等于“工”字钢屈服极限时推导出破碎覆岩条件下回采巷道临界宽度计算公式。以106煤矿为工程实例进行分析,结果表明:破碎覆岩回采巷道的合理临界宽度为4.4 m;增大支护强度和减小巷道高度可有效提高破碎覆岩回采巷道临界宽度;如果需要更大的巷道宽度,可通过降低棚间距或增大型钢型号方法实现。
In order to effectively control the deformation of roadway in the mining of broken overburden, the formation principle of Platts arch structure in broken overburden and the critical width of mining gateway are analyzed according to the occurrence characteristics of the steel shelter. According to the characteristics of the surrounding rock of the broken overburden roadway with low strength and no anchorability, Plank arch theory is used to calculate the surrounding rock pressure of the mining roadway. When the maximum normal stress of the shed beam “Gong” is equal to The calculation formula of the critical width of mining roadway under the conditions of broken overburden was deduced when the work steel yield limit was reached. Taking the 106 coal mine as an example, the results show that the reasonable critical width of the roadway with broken overburden is 4.4 m. Increasing the supporting strength and reducing the height of the roadway can effectively increase the critical width of the roadway with broken overburden. If larger The width of the roadway, can be reduced by shed spacing or increase the type of steel methods to achieve.