摘要
为探究锚索尾端与钻孔的不同倾斜程度对锚索破断的影响,建立了锚索受托盘、钢带等构件剪切作用时的理论力学模型。研制了由调心锚具和抗剪钢管组成的抗剪锚具,并分别对不同倾斜程度(10°、20°、30°、40°)下使用普通锚具和抗剪锚具的锚索抗剪切性能进行了测试。结果表明,倾斜角度对锚索极限轴力的影响较大。使用普通锚具时,在10°、20°、30°、40°的倾斜角度下,锚索的锚固效率均未达到95%。在30°~40°时,锚索轴力下降幅度最大。随倾斜角度增大,锚索破坏形式逐渐由拉断破坏转变为切断破坏。使用抗剪锚具时,不同倾斜角度下的锚固效果均优于普通锚具。在10°、20°、30°的倾斜角度下,锚固效率均达到了95%以上。在40°的倾斜角度下锚固效果提升显著,三组试验所得峰值轴力的平均值提高了36%。由此可见,锚索尾端的倾斜角度对锚索性能的发挥影响较大,使用抗剪锚具可以有效防止锚索尾部受剪切而破断。
To explore the influence of different inclination angles between the tail end of the anchor cable and the drilling hole on the fracture of the anchor cable,a theoretical mechanical model of the anchor cable under the shear of the tray,steel strip and other components was established.An anti-shear anchorage composed of self-aligning anchorage and anti-shear steel pipe was developed.The anti-shear performance of anchor cables using ordinary anchorage and anti-shear anchorage under different inclination degrees(10°,20°,30°and 40°)was tested.The results show that the inclination angle has a great influence on the ultimate axial force of the anchor cable.When using ordinary anchorage,the anchor efficiency of anchor cable did not reach 95%at the inclination angle of 10°,20°,30°and 40°.At the angle from 30°to 40°,the axial force of the anchor cable decreases the most.With the increase of inclination angle,the failure mode of anchor cable gradually changes from tensile failure to cutting failure.When using anti-shear anchorage,the anchor efficiency at different inclination angles is greater than that of ordinary anchorage.At the inclination angle of 10°,20°and 30°,the anchor efficiency reached more than 95%.The anchoring effect is also greatly improved at an inclination angle of 40°,and the average value of the peak axial force obtained by the three groups of tests is increased by 36%.The inclination angle of the tail end of the anchor cable has a great influence on the performance of the anchor cable.The use of anti-shear anchorage can effectively prevent the tail of the anchor cable from being broken by shear.The research content of this paper can provide reference for similar anchor cable failure problems.
作者
康彦军
柳敬涛
詹家旺
邹志鹏
张学东
吴超
KANG Yanjun;LIU Jingtao;ZHAN Jiawang;ZOU Zhipeng;ZHANG Xuedong;WU Chao(Jiulong Coal Mine,Jizhong Energy Fengfeng Group,Handan,Hebei 056000,China;School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Civil Engineering,Hebei University of Engineering,Handan,Hebei 056038,China)
出处
《河北工程大学学报(自然科学版)》
2025年第4期33-40,共8页
Journal of Hebei University of Engineering(Natural Science Edition)
基金
国家自然科学基金资助项目(42377148)。
关键词
锚索失效
机械式锚具
倾斜顶板
抗剪锚具
anchor cable failure
mechanical-type anchorage
inclined roof
anti-shear anchorage
