预紧力锚杆作用下锚固体协同锚固效应试验研究

Experiment study of synergistic anchorage efficiency in anchorage body with preload bolt

为了研究预紧力锚杆作用下锚固体内所产生的协同锚固效应现象,在实验室条件下制作一组模型试件。通过给锚杆施加不同预紧力,测试分析锚固体内不同测点所产生的应力值及应力场分布特征,证明协同锚固效应在锚固体内是客观存在的,并提出协同指数的概念和计算公式,以此建立协同效应的评价方法。研究表明,锚固体内协同锚固效应分布范围呈椭圆球形,且随着预紧力增大而增大。由此得知,锚杆预紧力对增强锚固体内协同锚固作用及协同锚固效应范围,提高其强度和刚度具有重要作用。

In order to study the synergistic anchorage efficiency in the anchorage body with preload bolt, a set of specimens are made under laboratory conditions. By applying various preload to the bolt, the experiment analyzes the stress value at different measuring points within the anchorage body and the features of stress distribution. It proves the objective existence of the synergistic anchorage efficiency in the anchorage body, puts forward the concept of synergistic index, and develops its calculation formula. In this way, the evaluation method of the synergistic efficiency is established. The study shows that the scope of synergistic anchorage efficiency within the anchorage body takes the shape of an ellipse, and increases when the preload rises. It is inferred that the bolt preload plays an important role in enhancing the synergistic anchorage effect in the anchorage body, expanding the scope of synergistic anchorage efficiency, and improvin~ its strength and stiffness.