Design Method for Rock Bolting in Mine Galleries

已有研究提出，锚杆轴向力的分布可以解析地得到，对应于锚杆周围的岩石变形。在本工程中，首先计算了三维应力状态下圆形巷道围岩随工作面推进的位移。因此，将锚杆安装在巷道工作面附近后，可以从理论上分析巷道工作面推进引起的锚杆轴向应力分布。所得结果可作为检验测量数据的标准之一。在此基础上，提出了基于锚杆总应变能的锚杆设计基本方法。根据该方法，可以粗略估计锚杆的长度和密度。

It is already proposed that axial force distributions induced in rock bolts, corresponding to the rock deformation around the rock bolt, can be obtained analytically. In this project, at first, the rock displacements around the circular tunnels with the advance of the face are calculated under the three dimensional stress state. Therefore, the axial stress distributions in rock bolts induced with the tunnel face advance can be analyzed theoretically, after they are installed close at the tunnel face. The results obtained seem to be very useful as one of the standards to examine the measuring data. Further, the fundamental design method for rock bolting based on the total amount of strain energy stored in the rock bolts is proposed. According to this method, the length and density of rock bolting can be estimated roughly.