研究压力分散型锚索在不同强度岩体中受力变形特征以及破坏模式,对分析此类锚索锚固机理和效应有着重要意义。根据广贺高速公路边坡加固工程,采用相似原理和应变测试方法,对3种不同强度岩体中压力分散型锚索加固效应进行了足尺模型室内对比试验,给出了注浆体轴向应变分布特点以及注浆体与孔壁剪应力分布规律,分析了锚索破坏特点和形式、注浆体在承载体附近的压应力集中现象等。通过对剪应力校核表明,试验采用的剪应变测试技术及试验方案是可靠的。 Studying the characteristics of stress and deformation of stress-relief anchors in rock masses with different intensities and the failure modes are of great significance for analyzing the anchoring mechanism and effects of such anchors. According to the slope reinforcement project of Guanghe Expressway, the similar principle and strain test method are adopted to conduct the full-scale model indoor contrast test on the reinforcement effect of pressure-dispersed anchor cables in three kinds of rock masses with different intensities, The distribution of strain, the distribution of shear stress on the grouting body and the hole wall, the characteristics and forms of the failure of the anchor cable and the stress concentration phenomenon of the grouting body near the bearing body are analyzed. The verification of shear stress shows that the shear strain test technique and test scheme adopted in the experiment are reliable.