强构造应力巷道高预紧力锚杆锚索联合支护效果研究

    Research on the effect of high pre tension anchor rod and cable combined support in strong structural stress tunnels

    • 摘要: 本文以新疆潞新二矿强构造应力巷道为背景,针对E4205下顺槽巷道围岩稳定性问题,对高预紧力锚杆锚索联合支护技术的应用效果进行了深入研究。首先,通过水压致裂地应力测试,测得最大水平主应力σH为13.33 MPa,最小水平主应力σh为7.05 MPa,垂直主应力σv为7.62 MPa,最大水平主应力方向北偏西47.0°;其次,采用FLAC3D数值模拟,研究了两种预紧力等级下锚杆对巷道围岩应力分布的影响规律,揭示了高预紧力锚杆支护产生的应力值更大,形成的有效压应力区范围更广;最后,针对强构造应力地层巷道,提出了“高预紧力锚杆锚索联合支护”方式,通过监测,对比分析了采用高预紧力锚杆锚索联合支护技术应用前后巷道围岩的变形,发现高预紧力锚杆锚索联合支护方式能有效控制该类巷道的变形,保证工作面的安全生产。

       

      Abstract: This paper is based on the strong structural stress tunnels of Luxin No.2 Mine in Xinjiang, and focuses on the stability of the surrounding rock of E4205 lower groove roadway. The application effect of high pre tension anchor rod and cable combined support technology is deeply studied. Firstly, the maximum horizontal principal stress is measured through hydraulic fracturing stress testing σH is 13.33 MPa, minimum horizontal principal stress σh is 7.05 MPa, vertical principal stress σv is 7.62 MPa, and the maximum horizontal principal stress direction is 47.0° northwest. Secondly, FLAC3D numerical simulation is used to study the influence of anchor rods on the stress distribution of tunnel surrounding rock under two different levels of pre tension. It is revealed that high pre tension anchor rod support produces larger stress values and forms a wider range of effective compressive stress zones. Finally, a “high pre tension anchor rod and cable combined support” method is proposed for tunnels with strong structural stress. Through monitoring and comparative analysis of the deformation of the surrounding rock of the tunnel before and after the application of high pre tension anchor rod and cable combined support technology, it is found that the high pre tension anchor rod and cable combined support method can effectively control the deformation of this type of tunnel and ensure the safe production of the working face.

       

    /

    返回文章
    返回