摘要
土钉是一种广泛应用于边坡开挖和边坡支护的原位加筋技术.钉-土界面抗剪强度,亦即土钉抗拔强度,是土钉支护结构设计中要用到的一个重要参数.对于钻孔灌注型土钉来说,土的剪胀性和土钉灌浆压力的大小是影响抗拔强度的重要因素.本文在室内土钉抗拔试验的基础上,建立了三维有限元模型研究这两个参数对土钉抗拔强度的影响.进行参数研究前首先用实测数据对模型进行了验证,模拟结果与实测数据吻合很好.数值分析结果表明,峰值抗拔应力随着剪胀角和灌浆压力的增加而显著增大.
Soil nailing is an in situ reinforcing technique that is widely used for stabilizing slopes and excavations.The nail-soil interface shear strength,that is,the pull-out strength of a soil nail is an important parameter which controls the design of a soil nailing structure.For drill-and-grout soil nails,the dilatancy of soil and grouting pressure are two important parameters which influence the pull-out strength.Based on the laboratory pull-out tests,a 3-D finite element model was established to investigate the influence of these two parameters on the pull-out strength of a soil nail.Before the parametric study was carried out,the model was firstly validated by comparing measured and simulated results.The agreement between the measured and simulated results was fairly good.The parametric study showed that the peak pull-out stress increased significantly with the increase in grouting pressure and dilation angle of the soil.
出处
《西安建筑科技大学学报（自然科学版）》
CSCD
北大核心
2011年第4期480-485,共6页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
西安建筑科技大学基础研究基金资助项目(JC0702)
校人才研究基金资助项目(RC0709)
关键词
土钉
抗拔强度
剪胀角
灌浆压力
有限元
soil nail
pull-out resistance
dilation angle
grouting pressure
finite element
