ABSTRACT

Anchor cables often break in various forms. Tensile failure can be resisted by using high-strength materials, while there is no good solution for shear failure. A new supporting structure called Anchor Cable and C-shaped tube that can bear the transverse shear force was invented and a preliminary introduction to the mechanism of the structure is given. Field investigations and in-situ stress tests were carried out on the panel 3210 in the Nanguan Mine. The failure modes of the surrounding rock and cables and the in-situ stress test results show that the working face is obviously affected by the horizontal stress. Thus, a new full-section anchor cable and C-shaped tube support scheme were proposed. The results of FLAC3D show that the new scheme is excellent in controlling the surface convergence and plastic zone extension. The rationality of the scheme was verified by two-and-a-half months of monitoring. Compared with the original scheme, the amount of surface displacement was at least 20% smaller, and the time for the displacement to reach equilibrium was at least 27.4% shorter. The surface of the roadway is flat without supporting material damaging. The new scheme is worth popularizing in similar working conditions.

摘要

锚索经常以各种形式断裂。使用高强度材料可以抵抗拉伸破坏，而剪切破坏没有很好的解决方案。发明了一种能承受横向剪力的新型锚索和C型管支撑结构，并初步介绍了该结构的机理。对南关矿3210板进行了现场勘查和原位应力测试。围岩和电缆的破坏模式及地应力试验结果表明，工作面受水平应力影响明显。因此，提出了一种新的全截面锚索和C形管支撑方案。FLAC3D的结果表明，新方案在控制表面收敛和塑性区扩展方面表现出色。通过两个半月的监测，验证了方案的合理性。与原方案相比，表面位移量至少减少了20%，位移达到平衡的时间至少缩短了27.4%。路面平整，不损坏支撑材料。新方案值得在类似工况下推广。