新型钉式双锚头压环锚杆锚固机理及工程应用

BOLTING MECHANISM OF A NEW NAIL-TYPE DUAL ANCHOR-ROOT PRESSING RING ANCHOR AND ENGINEERING APPLICATION

提出一种新型钉式双锚头压环锚杆，此种锚杆通过双锚头来提高锚固力，即：第一锚头起导向作用，第二锚头与围岩作用，提高锚杆的锚固力，在软岩中第一锚头有直接锚固作用。通过调整压环与锚头之间的距离来确定锚杆的锚固长度。还介绍了此种锚杆的技术参数，并与砂浆锚杆与管缝锚杆进行试验对比，发现钉式双锚头压环锚杆具有锚固力大，后期锚固可靠。锚杆受力后移出量小，能有效地加固围岩，阻止围岩变形，且安装打设迅速，并可立即承载，锚杆各部位结构设计合理，功能齐全，适应性强等特点。通过在大雁局三矿现场应用表明，其现场应用效果较好。

A new nail-type dual anchor-root pressing ring anchor is introduced and the anchorage force of the kind of anchor is provided by the dual anchor-root, i.e., the first anchor-root controls the anchor direction, and the second anchor-root can strengthen the anchoring force when the anchor is embedded in surrounding rock mass. Meanwhile, the first anchor-root can directly anchor the rock mass when it is used in the soft rock. The anchorage length of bolt can be controlled by adjusting the distance of anchor-boot and pressing ring. The technical parameters of bolt are also presented. By the testing contrasted with cement bolt and in-situ slot-bolt, it is found that the anchorage force of the nail-type dual anchor-root pressing ring anchor is considerably high, and its credibility of anchoring force can be guaranteed. The displacement of the bolt is comparatively lower, and it can validly strengthen and prevent the deformation of surrounding rock mass. At the same time, its construction is very quick, and it can stand the exerted loading immediately. Every part of this anchor has strong function and the anchor has good adaptability. By applying this kind of anchor at San coal mine in Dayan mine co., the supporting effect of the anchor is satisfactory.