热处理细径强力锚杆开发及应用

Development and application of heat treated small diameter strong bolt

为了降低支护成本,通过热处理工艺,开发出Φ18 mm-CRM600型细径强力锚杆,并在实验室进行了抗拉强度,"三径"匹配及构件匹配试验,形成热处理细径强力锚杆成套工艺及材料。针对漳村煤矿2601运输巷地质生产及支护条件,采用数值模拟的方法选取了支护参数,并在井下进行了现场试验。结果表明,采用Φ18 mm-CRM600型锚杆支护的试验巷道杆体初始预紧力在60~85 kN,最大受力为93 kN,两帮最大位移量为36 mm,顶板最大下沉量为45 mm,围岩变形得到有效控制,支护体受力稳定,支护效果良好。与普通Φ22 mm-HRB335高强锚杆相比,热处理细径强力锚杆提高杆体预紧扭矩转化效率约45%,节省材料成本约28%,有效降低了矿井巷道支护成本。

In order to reduce the cost of support,a small diameter intensive bolt of Φ18 mm-CRM600 was developed through heat treatment process,and tensile strength test,the " three-diameters" test and component matching test were conducted in the laboratory to form a set of heat-treated small diameter intensive bolt technology and materials.According to the geological production and supporting condition of 2601 transportation roadway in Zhangcun Coal Mine,the supporting parameters were selected by numerical simulation method,and the field test was carried out in underground mine.The result shows that average initial preload of Φ18 mm-CRM600 bolt was 60 ~85 kN,the maximum force of bolt was 93 kN,the maximum displacement of two walls was 36 mm and the maximum roof subsidence was45 mm.Those display the deformation of roadway has been effectively controlled,and the supporting body forces are stable.Heat-treated small diameter strong bolt has achieved the same anchor effect with ordinary high strength bolt of Φ22 mm-HRB335,but the former improves the pre-tightening torque conversion efficiency by 45%,saves material costs by 28%,and effectively reduces the supporting cost of mine roadway.