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邓 亮,张传庆,汤艳春,等. 锚杆形态参数对杆体-砂浆界面剪切力学行为的影响[J]. 科学技术与工程, 2020, 20(16): 6585-6592.
DENG Liang,张传庆,TANG Yan-chun,et al.The Effect of Bolt Profile Parameters on Shear Behaviorof Bolt–mortar Interface[J].Science Technology and Engineering,2020,20(16):6585-6592.
锚杆形态参数对杆体-砂浆界面剪切力学行为的影响
The Effect of Bolt Profile Parameters on Shear Behaviorof Bolt–mortar Interface
投稿时间:2019-09-12  修订日期:2020-06-17
DOI:
中文关键词:  杆体-砂浆界面  峰值剪切强度;锚杆形态参数  剪切耗能值;侧限剪切
英文关键词:bolt-mortar interface  peak shear strength  bolt profile  parameters  energy of shear deformation  confined shear test
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
              
作者单位
邓 亮 三峡大学土木与建筑学院
张传庆 中国科学院武汉岩土力学研究所
汤艳春 三峡大学土木与建筑学院
崔国建 中国科学院武汉岩土力学研究所
周 辉 中国科学院武汉岩土力学研究所
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中文摘要:
      为了研究锚杆形态参数对杆体-砂浆界面剪切性能的影响,开展了杆体-砂浆界面二维等效侧限剪切试验,探究了不同法向应力下各锚杆形态参数对界面峰值剪切强度τmax、剪切耗能值E的影响,基于逐步回归分析的结果表明:对峰值剪切强度而言,肋间距和肋高度是最主要的影响参数,而且这两个参数之间存在明显的耦合关系,肋角度对峰值剪切强度的影响与法向应力大小有关,而肋宽则影响微弱;对剪切耗能值而言,在低法向应力时,其与肋高度有关,而在高法向应力时,其与各形态参数均不显著。除此之外,基于爬坡比K和剪胀角β提出了破坏模式定量分类标准,得到了不同法向应力下锚杆的临界肋间距和肋角度,通过临界值可以判断界面的破坏模式。当肋间距小于临界值时,界面以切齿破坏为主,当肋角度小于临界值时,界面以滑移破坏为主,当肋间距和肋角度均大于临界值时,界面则会出现剪胀滑移破坏或剪切破碎破坏。试验结果为螺纹钢锚杆的形态优化提供了参考,同时为进一步揭示锚杆杆体-砂浆界面的破坏演化过程奠定了基础。
英文摘要:
      In order to study the effect of bolt profile parameters on the shear performance of bolt-grout interface, the two-dimensional confined direct shear tests were carried out. Analysis of experimental data found that rib spacing and height are the most important influential parameters for the peak shear strength, and there is a significant coupling effect between them. The influence of rib angle on peak shear strength is related to the normal stress and the rib width have little influence on it. There are some differences in energy of shear deformation under different normal stresses, energy of shear deformation is related with the height of rib under low normal stress, but there are no significant bolt profile parameters in the stepwise analysis under high normal stress. Besides, a quantitative classification criteria of the failure mode depend on the K and β are proposed and the critical rib spacing and rib angle of bolt under different normal stresses are obtained. Through the critical value the failure mode of interface can be judged. when the rib spacing is less than its critical value, the failure mode of interface is shear through failure. when the rib angle is less than its critical value, the failure is sliding failure. when the rib spacing and angle both greater than the critical value, the failure mode is dilation slip failure or sheared-crush failure. The research results provide a reference for the shape optimization of screw steel bolt and lay a foundation for further study the failure law of the bolt-mortar interface.
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