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随着煤矿开采深度的增加,巷道底鼓成为影响煤矿安全生产和经济效益的主要因素,巷道底板预应力锚索注浆是治理底鼓的有效措施。巷道底板预应力锚索注浆技术由于缺乏专用、行之有效的注浆封孔装置,导致施工工艺复杂、效率低、封孔效果差等问题。本文通过分析预应力锚索注浆封孔机理,采用K-ε二维湍流模型,得出了不同封孔长度及封孔缝隙宽度时浆液的流场分布规律,分析了浆液在缝隙中的流速与压力变化特征,确定了较合理的封孔长度与缝隙宽度参数值。利用流体理论计算得出了浆液在缝隙中的损失,得出了封孔长度与缝隙宽度的最优组合,为封孔装置结构尺寸设计及囊袋内封孔材料的配比要求提供了理论依据。结合研究成果,设计得出了新型预应力锚索注浆封孔装置。
As the depth of coal mining increases, the bottom drum of the roadway becomes the main factor affecting the coal mine safety production and economic benefits. The prestressed anchor grouting in the floor of the roadway is an effective measure to control the bottom drum. Roadway floor prestressed anchor grouting technology due to the lack of dedicated and effective grouting sealing device, resulting in complex construction techniques, low efficiency, poor sealing effect and other issues. In this paper, by analyzing the sealing mechanism of prestressed anchor grouting and adopting K-ε two-dimensional turbulence model, the flow field distribution of slurry with different seal length and seal gap width was obtained. The flow velocity of slurry in the gap And pressure change characteristics, to determine a more reasonable seal length and slit width parameter values. The loss of slurry in the gap was calculated by fluid theory, and the optimal combination of seal length and gap width was obtained, which provided a theoretical basis for the structural dimension design of seal device and the ratio of sealing material in the bladder . Combined with the research results, the design of a new prestressed anchor grouting sealing device.