Rock bolt support is an effective technique for controlling surrounding rock of deep roadway. The stability of the anchorage body composed of rock bolts and surrounding rock mass is the core in keeping the stability of roadways. In this paper, the UDEC Trigon model was used in simulating uniaxial compressive test on the anchorage body under different pretension loads. The energy equilibrium criterion of the anchorage body under the uniaxial compressive state was proposed. Furthermore, the fracture evolution and the energy dissipation during the failure process of the anchorage body were analyzed. Results showed that before the peak strength, the external work was stored in the anchorage body in the form of the elastic strain energy (U^e). After the peak, energy dissipated through three ways, including the fracture developing friction (W_f), plastic deformation (W_p), and acoustic emission (U^r). Based on the simulation results, the high pretensioned rock bolts can eliminate the continuous tensile fractures in the anchorage body, decreasing the damaging extent of the anchorage body and the energy that was consumed by the following two main approaches: fracture developing friction (W_f) and plastic deformation (W_p). Moreover, the surplus of the elastic strain energy (U^e) and the strength of the anchorage body can be improved. The pretension load had a positive relationship with elastic strain energy and a negative relationship with the anchorage body damage degree. Based on the above research, the transport roadway of the working face 6208 in the Wangzhuang Coal Mine selected tensile rock bolts to establish the high-performance anchorage body. The monitoring data showed that this reinforcement method effectively managed the serious deformation issue of the roadway surrounding the rock masses.

中文翻译：

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锚固体断裂演化与能量耗散规律的研究：张拉式锚杆与扭力式锚杆的比较

锚杆支护是控制深部巷道围岩的有效技术。由锚杆和围岩组成的锚固体的稳定性是保持巷道稳定性的核心。本文采用UDEC Trigon模型对不同预应力载荷下锚固体的单轴压缩试验进行仿真。提出了单轴压缩状态下锚固体的能量平衡判据。此外，分析了锚固体破坏过程中的断裂演化和能量耗散。结果表明，在峰值强度之前，外部功以弹性应变能（U ^e）。峰值之后，能量通过三种方式耗散，包括断裂发展摩擦力（W _f），塑性变形（W _p）和声发射（U ^r）。根据模拟结果，高预应力锚杆可以消除锚固体中的连续拉伸断裂，减少锚固体的破坏程度和以下两种主要方法消耗的能量：断裂发展摩擦力（W _f）和塑性变形（W _p）。而且，剩余的弹性应变能（U ^e），可以提高锚固体的强度。预应力载荷与弹性应变能正相关，与锚固体损伤程度负相关。在以上研究的基础上，王庄煤矿6208工作面的运输巷道选用抗拉锚杆建立高性能锚固体。监测数据表明，该加固方法有效地解决了围岩巷道严重变形问题。