摘要
为了更好地应对传统锚杆在边坡、隧道灾害防治领域锚固性能的不足,研发了一种具有分级侧向膨胀性能的锚杆结构。首先,基于弹性力学理论与物理圆环模型,得到了分级侧向膨胀锚杆径向承载变形的本构关系与极限抗拉拔力公式;然后,通过静态拉拔试验,揭示了锚杆的承载力传递规律与承载变形机理;最后,通过对分级侧向膨胀锚杆与NPR锚杆的结构特性进行对比,发现分级侧向膨胀锚杆不仅在抗剪切、扭转和吸能等方面具有更优异的性能,且相比较NPR锚杆的单次膨胀特性,其分级膨胀与可控变形的特性在提高围岩整体稳定性,释放围岩变形能方面更具优势。结果表明,分级侧向膨胀锚杆的特性更加适合稳定性较差的地质环境,为灾害防治工程提供了新的解决方案。
In order to cope with the shortcomings of anchorage performance of traditional bolts in the field of slope,and tunnel disaster prevention,a graded lateral expansion bolt was developed,whose structural mechanical properties and anchoring mechanism are analyzed in this paper.Firstly,the constitutive relation and ultimate pullout force formula of graded lateral expansion bolt under radial load-bearing deformation are obtained based on elastic mechanics theory and physical ring model.Secondly,through the static pull test,the bearing capacity transmission law and the bearing deformation mechanism of the bolt are obtained.Finally,it is found that the bolt not only has better performance in shear resistance,torsion and energy absorption,but also has more advantages in improving the overall stability of surrounding rock and releasing the deformation energy of surrounding rock by comparing the structural characteristics of graded lateral expansion bolt and NPR bolt.The results prove that the characteristics of the graded lateral expansion bolt are more suitable for the geological environment with poor stability.This study provides ideas for the research and development of new bolts,as well as new solutions for tunnel and slope disaster prevention projects.
作者
袁维
王立言
裴子豪
孙瑞峰
王伟
Yuan Wei;Wang Liyan;Pei Zihao;Sun Ruifeng;Wang Wei(Shijiazhuang Tiedao University,School of Civil Engineering,Shijiazhuang 050043,P.R.China;China Railway Bureau Group Urban Construction Co.,Ltd.,Guiyang P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2024年第3期868-876,共9页
Chinese Journal of Underground Space and Engineering
基金
河北省自然科学基金优秀青年基金(E2021210041)
河北省重点研发计划项目(22375402D,22375420D)
河北省教育厅重点项目(ZD2020333)
贵州省科技支撑计划(黔科合支撑[2022]一般002)。
关键词
裂隙岩体
静态拉伸
锚固机理
分级侧向膨胀
边坡灾害防治
fractured rock mass
static stretch
anchoring mechanism
graded lateral expansion
slope disaster prevention
