黄土中压力型锚索锚固段应力分析

为研究黄土地区压力型锚索锚固机理,根据压力型锚索锚固段受力状态,基于三线型剪切-滑移模型,推导了注浆体与岩土体界面在弹性阶段所对应的剪应力及轴向应力分布的闭合解.根据相关压力型锚索锚固试验数据,采用推导的闭合解计算了不同张拉荷载作用下界面的剪应力分布,并与试验结果进行了对比.结果表明,各级张拉荷载作用下注浆体/岩土体界面剪应力的分布及其最大值与试验结果基本吻合,验证了本文提出解析模型的正确性与可靠性;压力型锚索锚固界面剪应力呈指数分布规律,在承压板附近剪应力分布集中且应力较大,随着离承压板距离的增大,剪应力逐渐减小;压力型锚索锚固界面剪应力峰值随外荷载增大而增大.研究结果可为压力型锚索的设计和计算提供一种理论参考.

Research on Anchoring Stress of Compression Anchors in Loess Areas

In order to study the anchoring mechanism of the compression anchors in the loess area, the closed-form solutions for the interfacial shear stress distribution and axial stress distribution along the bond length were derived using the tri-linear model of bond-slip relationship. The related experimental data of the compression anchors were compared to validate the analytical model. The interfacial shear stress distribution by the derived solution is in a good agreement with the experimental results, which demonstrates the validity and reliability of the proposed analytical model. The results indicate that the interfacial stress distribution exhibits an exponential distribution, the interfacial stress is very high near the bearing plate, and reduces with increasing the distance from the bearing plate; the peak shear stress increases with the tensile loads. The research results herein can provide a theoretical basis for the design and calculation of this kind of compression anchors.