综放巷内充填原位沿空留巷充填体支护阻力研究

在综放巷内充填原位沿空留巷技术基础上,根据岩层控制的关键层理论,建立综放巷内充填原位沿空留巷围岩结构力学模型,推导出不同地质条件下巷内充填体的支护阻力计算公式,并对围岩与巷内充填体之间的相互作用机制进行深入分析。研究结果表明,留巷围岩的稳定性与充填体的支护阻力和巷内支护方法密切相关。采用锚梁网索巷内支护技术结合及时巷内充填和加强临时支护等工艺措施,可形成良好的充填体-围岩共同承载体系,能充分发挥留巷围岩的自承能力,增强巷道整体性,有效减小需由充填体来平衡的围岩载荷。现场工业性试验表明,该项技术的应用是成功而有效的,综放巷内充填原位沿空留巷围岩结构力学模型和支护阻力计算公式是合理的,可在类似条件的综放工作面中推广应用。

STUDY ON PACKING BODY SUPPORTING RESISTANCE OF ENTER-IN PACKING FOR IN-SITU GOB-SIDE ENTRY RETAINING IN FULLY- MECHANIZED TOP-COAL CAVING MINING FACE

Based on the technique of in-situ gob-side entry retaining with entry-in packing in fully-mechanized top-coal caving mining face(GEREPTF),the mechanical model of the surrounding rock for GEREPTF is established according to the key strata theories.Based on these theories,the reasonable calculation formulas of the packing body supporting resistance are presented.According to the different field conditions,the interaction relationship between the packing body and the surrounding rock is also studied.The results show that the surrounding rock stability is closely related with the packing body and the entry support method.The adoption of bolting with bar,wire meshes and cable support techniques in the entry combined with the technical measures of timely packing and strengthening temporary support can guarantee the integrity of the entry.Thus the packing body and the surrounding rock can formulate a good and corporate carrying capacity system.It can improve the bearing capacity of the surrounding rock;so the necessary packing body supporting resistance can be greatly reduced.The successful field industrial test proves that the GEREPTF technique and its corresponding mechanical model and calculation formulas of the packing body supporting resistance can be adopted for the convenience and rationality,which can be employed for similar fully-mechanized top-coal caving mining face.