湖南科技大学学报（自然科学版）
湖南科技大學學報（自然科學版）
호남과기대학학보（자연과학판）
JOURNAL OF HUNAN UNIVERSITY OF SCIENCE & TECHNOLOGY（NATURAL SCIENCE EDITION）
2015年
2期
8-13
,共6页
深埋巷道%锚杆破断%失效机理%加载模式%控制思路
深埋巷道%錨桿破斷%失效機理%加載模式%控製思路
심매항도%묘간파단%실효궤리%가재모식%공제사로
deep roadway%bolt breaking%failure mechanism%load pattern%control idea
锚杆破断失效是深埋巷道支护面临的工程问题之一。采用现场调研、理论分析等方法，对深埋巷道锚杆破断失效形式、机理进行了分析。得到结论：1）深埋巷道锚杆破断失效形式主要有剪断失效、脆断失效、折断失效、拉断失效、崩盘失效和松脱失效；2）材料缺陷和受载性能是深埋巷道锚杆破断失效的内因，荷载超过极限荷载是深埋巷道锚杆破断失效的外因；3）拉伸、剪切、扭转等载荷复合作用下，锚杆有效直径减小，拉应力增大，导致破断失效；4）采用恒阻大变形锚杆或二次支护工艺，能够实现深埋巷道锚杆破断失效和围岩变形的协调控制。研究结果对深埋巷道围岩控制具有参考意义。
錨桿破斷失效是深埋巷道支護麵臨的工程問題之一。採用現場調研、理論分析等方法，對深埋巷道錨桿破斷失效形式、機理進行瞭分析。得到結論：1）深埋巷道錨桿破斷失效形式主要有剪斷失效、脆斷失效、摺斷失效、拉斷失效、崩盤失效和鬆脫失效；2）材料缺陷和受載性能是深埋巷道錨桿破斷失效的內因，荷載超過極限荷載是深埋巷道錨桿破斷失效的外因；3）拉伸、剪切、扭轉等載荷複閤作用下，錨桿有效直徑減小，拉應力增大，導緻破斷失效；4）採用恆阻大變形錨桿或二次支護工藝，能夠實現深埋巷道錨桿破斷失效和圍巖變形的協調控製。研究結果對深埋巷道圍巖控製具有參攷意義。
묘간파단실효시심매항도지호면림적공정문제지일。채용현장조연、이론분석등방법，대심매항도묘간파단실효형식、궤리진행료분석。득도결론：1）심매항도묘간파단실효형식주요유전단실효、취단실효、절단실효、랍단실효、붕반실효화송탈실효；2）재료결함화수재성능시심매항도묘간파단실효적내인，하재초과겁한하재시심매항도묘간파단실효적외인；3）랍신、전절、뉴전등재하복합작용하，묘간유효직경감소，랍응력증대，도치파단실효；4）채용항조대변형묘간혹이차지호공예，능구실현심매항도묘간파단실효화위암변형적협조공제。연구결과대심매항도위암공제구유삼고의의。
Bolt breaking is one of engineering problems of deep roadway support.The form and mechanism of bolt breaking was studied by using site investigation and theoretical analysis.Following results were obtained:1 )The forms of bolt breaking in deep roadway are shear failure,brittle fracture failure,breaking failure,tensile failure,ejection failure and loosening failure;2)Material defect and bearing behavior are the intrinsic cause of bolt breaking in deep roadway,and the extrinsic cause lies in the overload,namely the load of bolt exceed its limit load;3)Under the combined effect of tensile load,shear load and torsion load,the effective diameter of the bolt decrease and the tensile stress in the bolt increase,as a result,the bolt is broken easily;4)Coordinated control of bolt breaking and surrounding rock deformation in deep roadway can be realized using constant resistance and large deformation anchor bolt or secondary support technology.The results provide a reference for surrounding rock control of deep roadway.
