套筒式高抗水平应力新型锚杆的研究与应用

    Research and Application of a Novel Sleeve-type Anchor with High Horizontal Stress Resistance

    • 摘要: 本文在综合分析影响煤矿巷道稳定性因素的基础上,确定高地应力和低岩体强度之间的矛盾是导致巷道失稳的主要因素。根据对深部原岩水平应力及水平应力分布的情况分析,突出套筒式高抗水平应力新型锚杆(以下简称套筒锚杆)在巷道支护中的结构、性能优势。经过试验室采集数据对比,相较螺纹钢裸锚杆而言,套筒锚杆抗剪强度提升幅度达到50%以上。套筒锚杆在平煤十一矿工业性试验进一步表明,与传统高强让压锚杆相比,套筒锚杆抗剪切力大幅增长,产品支护强度更加可靠,破断率为0,围岩两帮收敛少变形100~250 mm,满足煤矿井下巷道支护要求而值得大力推广。

       

      Abstract: Through an extensive analysis of the variables influencing the stability of coal mine roadways, this study suggests that the primary factor contributing to roadway destabilization is the conflict between high geopathic stress and low rock strength.The examination of horizontal stress and its distribution within deep protolith revealsthe structural and performance advantages of the innovative sleeve-type anchor with strong horizontal stress resistance (hereinafter referred to as sleeve anchors) in roadway support are highlighted.Upon analyzing the laboratory data, it was observed that the shear strength of the sleeve anchors increased by more than 50% in comparison to the bare rebar anchors.Industrial testing conducted at theNo. 11 mine of the Pingdingshan Shenma Group has shown that sleeve anchors exhibit significantly higher shear resistance than traditional high-strength let pressure anchors. This improvement coincides with a more reliable product support strength, resulting in a breaking rate of 0. Furthermore, the distortion of perimeter rock convergence has been reduced by 100 to 250 mm, meeting the support requirements for underground tunnels in coal mines. These findings indicate that the novelsleeve anchors deserve considerable promotion for widespread implementation.

       

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