CAJ | 학술논문

针对协庄矿1202E 运输巷支护现状,通过现场工业性试验,对相同条件下深部软岩巷道采用原全螺纹钢锚杆支护、淮北高强锚杆支护和高预紧力强力锚杆支护3种支护形式进行对比试验研究,分析了试验结果.试验结果表明,全螺纹钢锚杆支护由于强度低、预紧力小,支护效果差,断面收缩率为45.5％；淮北高强锚杆支护在锚杆受力和控制巷道变形方面有所改善,但还不能满足支护要求；高预紧力强力锚杆强度与刚度大,实现了高预紧力,杜绝了锚杆拉伸破坏,有效控制了顶板离层和两帮位移,顶板离层量小于10 mm,底臌量在300 mm以内,两帮移近量小于200mm,断面收缩率仅为13.6％.因此,相比前两种支护,高预紧力强力锚杆支护能更有效地控制巷道围岩变形发展,提高围岩的稳定性.
침대협장광1202E 운수항지호현상,통과현장공업성시험,대상동조건하심부연암항도채용원전라문강묘간지호、회북고강묘간지호화고예긴력강력묘간지호3충지호형식진행대비시험연구,분석료시험결과.시험결과표명,전라문강묘간지호유우강도저、예긴력소,지호효과차,단면수축솔위45.5％；회북고강묘간지호재묘간수력화공제항도변형방면유소개선,단환불능만족지호요구；고예긴력강력묘간강도여강도대,실현료고예긴력,두절료묘간랍신파배,유효공제료정판리층화량방위이,정판리층량소우10 mm,저고량재300 mm이내,량방이근량소우200mm,단면수축솔부위13.6％.인차,상비전량충지호,고예긴력강력묘간지호능경유효지공제항도위암변형발전,제고위암적은정성.
In view of the supporting status in 1202E transportation gateway of Xiezhuang coal mine,through the in-situ industrial test,3 supporting ways of original full-thread steel bolt support,Huaibei high-strength bolt support and high-pretension powerful bolt support adopted in deep soft-rock roadway under the same conditions are researched comparatively,and the re-sults are analyzed.The results show that the full-thread steel bolt support is of low strength,low pretension and has bad supporting effect,and the area reduction of roadway is 45.5 %;the Huai-bei high-strength bolt support does better in the aspect of bolt stress and roadway deformation control,whereas it does not meet the factual supporting demand of the roadway;the high-preten-sion powerful bolt is of high strength,high stiffness and high pretension,and eradicates the ten-sile failure of bolt,which has effectively controlled the roof separation and two ribs displacement:the roof separation is less than 10 mm,the floor heave less than 300 mm,and the convergence of two ribs is less than 200 mm,and the area reduction is only 13.6%.Therefore,compared with the other two supporting ways,the high-pretension powerful bolt support can control the de-formation development of roadway surrounding rock more effectively and obviously improve the stability of roadway surrounding rock.