The existence of the weak interlayer in the roadway surrounding rock mass presents a huge threat to the stability of the underground structure and the safety of mining engineering. By the characteristics of strong adaptability, superior anchoring effect and high efficiency of construction, rock bolt has been widely applied in mine reinforcement. However, the influence of the weak interlayer on the compressive performance of the bolted rock mass is still poorly understood due to the challenges in constructing an efficient experimental platform and complex testing processes. Here, we used the self-developed test system to investigate the influence of the thickness, uniaxial compressive strength, and dip angle of the weak interlayer on the compressive behavior of the bolted rock mass with a single free surface. The results show that the weak interlayer has a great weakening effect on the peak strength and elastic modulus of the specimens due to its low mechanical properties, as well as influencing the crack distribution and failure mode of the samples. As the strength of the weak interlayer is lower than 1.27 MPa, the thickness exceeds 20 mm, and the dip angle exceeds 15°, the synergistic bearing effect will be significantly reduced and affect the mechanical performance of the specimens. The evolution of the bolt force and bending moment are greatly impacted by the deformation process which could be divided into distinct stages of destruction, thereby providing an excellent detection method for judging the stability of the surrounding rock of the mine. The discovery of this research promote a better understanding of the impact of the weak interlayer on mining engineering and guide the mine reinforcement in the future.

中文翻译：

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弱夹层对深部开采单自由面锚固岩体力学性能的影响

巷道围岩中弱夹层的存在对地下结构的稳定性和采矿工程的安全性构成了巨大的威胁。锚杆具有适应性强，锚固效果好，施工效率高的特点，已在矿山加固中得到了广泛的应用。然而，由于构造有效的实验平台和复杂的测试过程所面临的挑战，对于夹层岩体的抗压性能的影响，薄弱夹层的影响仍然知之甚少。在这里，我们使用自行开发的测试系统来研究厚度，单轴抗压强度和弱夹层的倾角对具有单个自由表面的锚固岩体的抗压性能的影响。结果表明，薄弱的夹层由于其较低的力学性能，对试样的峰值强度和弹性模量具有很大的削弱作用，并且影响了试样的裂纹分布和破坏方式。当薄弱夹层的强度低于1.27 MPa，厚度超过20 mm，倾角超过15°时，协同承载作用将大大降低，并影响试样的机械性能。锚杆力和弯矩的变化受变形过程的影响很大，变形过程可以分为破坏的不同阶段，从而为判断矿井围岩的稳定性提供了一种极好的检测方法。