CAJ | 학술논문

针对金川矿区大断面巷道在强构造应力作用下围岩变形严重的情况，提出了中空预应力注浆锚杆的支护工艺。通过数值计算得出以下结论：相比传统的普通砂浆锚杆支护工艺，采用中空预应力注浆锚杆支护工艺能够主动加固围岩，提高支护刚度；巷道两帮的变形减小了约14.56％，最大、最小主应力分别降低了4.4％和7.2％，粘结层破坏范围也随之减小。通过对支护后巷道变形监测发现：两帮最终变形量减小了约36.6％；通过抗拔实验，中空预应力注浆锚杆的抗拔力达到140kN，远大于普通砂浆锚杆的40kN抗拔力，中空预应力注浆锚杆有更好的支护效果。
침대금천광구대단면항도재강구조응력작용하위암변형엄중적정황，제출료중공예응력주장묘간적지호공예。통과수치계산득출이하결론：상비전통적보통사장묘간지호공예，채용중공예응력주장묘간지호공예능구주동가고위암，제고지호강도；항도량방적변형감소료약14.56％，최대、최소주응력분별강저료4.4％화7.2％，점결층파배범위야수지감소。통과대지호후항도변형감측발현：량방최종변형량감소료약36.6％；통과항발실험，중공예응력주장묘간적항발력체도140kN，원대우보통사장묘간적40kN항발력，중공예응력주장묘간유경호적지호효과。
Aiming at the serious deformation of surrounding rock under strong tectonic stress in large section road -way of Jinchuan mining area , the support technology with the hollow pre-stress grouting anchor was put forward . Through numerical calculation , the following conclusions were drawn .Comparing with the traditional supporting form with mortar bolt , the surrounding rock is passively reinforced and the support rigidity is enhanced by the sup -port technology with the hollow pre-stress grouting anchor .The deformation in two-sides of the roadway are reduced by 14.56%, the maximum and minimum main stress are reduced by 4.4%and 7.2%respectively, and the dam-age range of bonding layer is decreased .According to the monitoring results on deformation of the roadway after supporting , it showed that the final deformation of the two-sides is reduced by nearly 36 .6%.Through anti-pulling test, the pull-out resistance of hollow pre-stress grouting anchor is up to 140 KN, which is far greater than that of ordinary bolts , being as 40 KN.The hollow pre-stress grouting anchor has better support effect .