摘要
为研究土钉的峰值摩阻力与一些主要参数的关联性,量化灌浆压力、上覆土压力以及土体剪胀角对土钉峰值摩阻力的影响,首先,利用小孔扩张理论提出土钉周围破坏面与土钉灌浆压力的关联性;其次,根据土体的摩尔破坏理论推导土钉峰值摩阻力与土体破坏面正应力的关系;然后,利用室内试验结果验证提出模型的有效性;最后,根据土钉峰值摩阻力的计算简化模型展开参数研究,深入分析不同参数对土钉峰值摩阻力的影响.参数分析证明:土钉的峰值摩阻力同时受到灌浆压力、上覆土压力以及破坏面距离的相互作用影响,且土钉峰值摩阻力的增加幅度在无注浆压力比存在注浆压力时要快.该模型较为简化且利于设计中进行考虑计算.
To investigate the correlation between peak pullout resistance of soil nails and some key parameters, and quantify the influences of grouting pressure, overburden stress and dilation angle of soils on the peak pullout resistance of soil nails, the correlation between cavity expansion theory and surrounding pressure on failure surface of soil nails was firstly proposed. Then, the relationship of the normal stress on the failure surface and peak pullout resistance of soil nails was derived according to Mohr-Column failure theory. In addition, the calculation method for peak pullout resistance was validated by laboratory test data and model data. Finally, a parametric study was carried out according to the proposed simple model to investigate the influence of different parameters on the peak pullout resistance of soil nails. This model was simple to be used in the design. Parametric study indicates that the grouting pressure, overburden stress and failure surface distance have interactive influence on the peak pullout resistance of soil nails, and their increasing rates under grouting pressure are much larger than that without grouting pressure.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第A01期204-209,共6页
Journal of Southeast University：Natural Science Edition
基金
地震动力学国家重点实验室开放基金课题资助项目(LED2013B01)
国家自然科学基金青年科学基金资助项目(41602352)
广东省高等学校结构与风洞重点实验室资助项目(201603)
关键词
土钉
灌浆压力
上覆应力
剪胀角
峰值摩阻力
soil nails
grouting pressure
overburden stress
dilation angle
peak pullout resistance
