砾石地层中自钻式锚杆锚固特性现场试验与数值仿真  

Field Test and Numerical Simulation of Anchoring Characteristics of Self-drilling Anchor in Gravel Stratum

作　　者：陈向琳 王超圣 许战波 孙晓刚 CHEN Xiang-lin;WANG Chao-sheng;XU Zhan-bo;SUN Xiao-gang(School of Civil Engineering and Architecture,Henan University of Science and Technology,Luoyang 471000,China;Luoyang Hengnuo Anchor Technology Co.,Ltd.,Luoyang 471000,China)

机构地区：[1]河南科技大学土木建筑学院,洛阳471000 [2]洛阳恒诺锚固技术有限公司,洛阳471000

出　　处：《科学技术与工程》2024年第20期8655-8662,共8页Science Technology and Engineering

基　　金：国家自然科学基金(52104082)。

摘　　要：自钻式锚杆为集钻进、注浆、锚固功能为一体的新型锚杆,能够克服卵砾石地层易塌孔及套管施工效率低的难题,拥有施工效率高、综合经济效益良好等优点,具有广阔的工程应用前景。基于洛阳某卵砾石场地现场拉拔试验与ABAQUS数值模拟相结合的方法,探讨了自钻式锚杆在砾石地层中的锚固特性和荷载传递规律。结果表明:自钻式锚杆在砾石地层中的锚固性能优异,能够满足工程需求。锚固体-土体界面平均黏结强度随锚固长度的增加逐渐降低;锚杆轴应力、剪应力和锚固体轴应力沿锚固深度呈指数分布;锚固体剪应力随锚固深度的增加先快速上升后逐渐下降,剪应力峰值随荷载的增加不断增大,但峰值点位置基本不变;随着拉拔荷载增加,锚杆对周围土体应力的径向影响范围增大,而深度方向影响范围维持在一定数值附近。Self-drilling anchor is a new type of anchor integrating drilling,grouting and anchoring functions,which can overcome the problems of easy collapse holes and low construction efficiency of pebble gravel formation,and has the advantages of high construction efficiency and good comprehensive economic benefits,and has broad engineering application prospects.Based on the combination of on-site pull-out test and ABAQUS numerical simulation at a gravel site in Luoyang,the anchoring characteristics and load transfer laws of self-drilling anchor in gravel stratum were discussed.The results show that the self-drilling anchor has excellent anchoring performance in gravel stratum,which can meet the engineering requirements.The average bonding strength at the anchorage body-soil interface gradually decreases with the increase of anchor length.The axial stress,shear stress and anchorage body shaft stress are distributed exponentially along the anchoring depth.With the increase of anchor depth,the shear stress of anchorage body first rises rapidly and then gradually decreases,and the peak shear stress increases with the increase of load,but the peak point position remains basically unchanges.With the increase of drawing load,the radial influence range of the anchor on the surrounding soil stress increases,while the depth direction influence range remains around a certain value.

关 键 词：自钻式锚杆 砾石地层 锚固特性 有限元 应力分布 

分 类 号：TU470[建筑科学—结构工程]