新型高强预应力让压锚杆巷道支护性能的数值模拟

一种新型的高强高预应力让压锚杆在国内煤矿深埋巷道支护中得到了成功应用，与普通锚杆相比，高强度、高预应力和让压性能是其主要特点。基于高强预应力让压锚杆力学模型，建立了让压锚杆-围岩相互作用体系的有限元数值模型，并对巷道围岩应力分布、位移和锚杆受力性能进行了分析。结果表明，高强预应力让压锚杆系统能够减小锚杆荷载，且可防止大变形和深井巷道支护中锚杆过早地进入屈服，对杆体具有保护作用。

Numerical simulation of entry performance supported by a new high strength and high pretension yieldable bolts

The new high strength and high pretension yieldable bolts have been successfully applied to the entry support of deep coal mine in China. Compared with the high strength and high pretension bolts used in coal mine, the new bolts have the high strength, high pretension and yieldable characteristics. Based on the mechanical model of the high strength and high pretension yieldable bolt, a finite element numerical model of the adjacent rock-bolts interaction is constructed. The stress and displacement distribution around entry and roof bolt loading are analyzed through FEM model. The results show that the yieldable mechanism of the bolt system can reduce the bolt load, thus prevent the bolt system from yielding in the condition of large deformation and deep coal mine.