采矿与安全工程学报2025，Vol.42Issue(5)：1008-1018,11.DOI:10.13545/j.cnki.jmse.2025.0049
深埋巷道复合顶板多层锚固合理级差研究
Rational differential grading of multi-layer anchorage for composite roof in deeply buried coal roadway
摘要
Abstract
Aiming at the issues of large deformation,sudden deformation,and anchor cable failure in deeply buried composite roof roadways,this study investigated the stratified deformation characteristics of the composite roof,the load-bearing process characteristics of the support materials,and the synergis-tic behavior of multi-layer anchorage through experiments,numerical simulation,and mechanical calcu-lation.Moreover,a method for determining the rational grade difference was proposed.The results show that the strata within 2.4 m of the composite roof undergo significant bending deformation,while the deeper region experiences overall minor deformation.The deformation in the middle region is 2.14 times that of the sides,indicating that the shallow and middle regions are the critical areas for support.The elongation rate of Φ22-500 MPa ribbed steel rockbolts is more than 2.91 times that of 1×19-Φ21.8 mm and 1×19-Φ28.6 mm anchor cables,but the strength of the anchor cables is more than 2.59 times that of the rockbolts.Besides,the elastic elongation rate of the rockbolts accounts for only 1/7 of the to-tal elongation rate,whereas that of the anchor cables is close to half,which means that different support materials can hardly fully bear the load in a coordinated manner.Based on the strata deformation and the properties of support materials,the support grade difference issue was transformed into a problem of co-ordination between the rod length and the strata deformation.A multi-level support synergy factor was defined,and the principle for designing support lengths was proposed.That is,each level of support must accommodate the strata deformation,with the minimum support length exceeding the height of the pressure arch and the maximum support length not exceeding the controllable strata thickness;mean-while,the allowable deformation of the upper support level should be greater than that of the lower sup-port level.According to this principle,a method for determining the rational grade difference of multi-layer anchorage was proposed.Field application demonstrated that the three-level support scheme sup-ported by this research effectively controlled the composite roof deformation,providing reference value for the support of roadways under similar conditions.关键词
复合顶板/多层锚固/锚索破断/协同承载/支护级差Key words
composite roof/multi-layer anchorage/anchor cable breakage/synergistic load-bearing/differential support grading分类
矿业与冶金引用本文复制引用
韩昌良,林成,王峥嵘,张农..深埋巷道复合顶板多层锚固合理级差研究[J].采矿与安全工程学报,2025,42(5):1008-1018,11.基金项目
国家自然科学基金项目(52274101) （52274101）
国家自然科学基金重点项目(52034007) （52034007）
国家重点研发计划项目(2023YFC2907603) （2023YFC2907603）
