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在软岩巷道、动压巷道及其他复杂条件下,刚性锚杆难以适应围岩较大变形量的需要,因而提出了发展可拉伸锚杆的问题。本文介绍了锚杆杆体可拉伸及锚杆结构元件滑动可拉伸的主要型号、基本原理及优缺点,提出了可拉伸锚杆的设计原则,指明了发展可拉伸锚杆的前景。
Under the conditions of soft rock roadway, dynamic pressure roadway and other complex conditions, it is difficult for rigid rock bolt to adapt to the large deformation of surrounding rock. Therefore, the problem of developing stretchable rock bolt is proposed. In this paper, the main models, basic principles and their advantages and disadvantages of the stretchability of the anchor rod body and the sliding and anchoring of the structural elements of the anchor rod are introduced. The design principle of the stretchable anchor rod is put forward and the prospect of developing the stretchable anchor rod is pointed out.