The contact finite element method is used in present paper to analyze stress of bolt connection structure.
应用接触有限元方法，对螺栓联接结构进行了应力分析。
Under the action of tensile stress and tensile stress, the bolt with relatively low strength will crack first, and then the fatigue fracture will occur.
在拉应力和应拉力交替的作用下，强度相对较低的螺栓会先产生裂纹，进而发生疲劳断裂。
It is shown that the characteristics of shear stress acting on bolt vary in different zones zone of surrounding rock and are reflected in the axial stress distribution of bolt.
结果表明，在围岩不同区内，锚杆所受剪切力具有不同的特点，而且，锚杆所受剪切的特点在锚杆轴力分布中得到了反映。
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