锚杆支护密度对锚固复合承载体承载特性影响规律试验研究

Bearing characteristic of composite rock-bolt bearing structure under different bolt support density

锚杆群的共同作用使锚杆和其锚固范围内的岩体形成一定强度的承载结构,该结构对巷道的稳定性起到至关重要的作用,称之为"锚固复合承载体"。根据自行研制的锚固复合承载体测试系统研究锚杆支护密度对承载体承载特性的影响规律,获得了锚固复合承载体的强度及其破坏特征,揭示了锚固复合承载体中心应力和围岩移近量的变化规律。最后理论计算了锚固复合承载体强度,理论计算结果与修正后实测结果相差不大。

The composite rock-bolt bearing structure, which is formed by bolts and surrounding rock duo to the interaction of bolt group with reasonable bolt length and density, can play a vital role in the roadway stability control. In this paper, based on self-developed test system of composite rock-bolt bearing structure, the effect law of bolt support density on bearing characteristics of the structure was studied, the actual strength and failure characteristics were measured, and the variation laws of inner stress of composite rock-bolt bearing structure and surrounding rock deformation were revealed. Moreover, the strength of composite rock-bolt bearing structure was further calculated, and the theoretical calculation results are close to the revised measured results.