论文部分内容阅读
通过室内试验与细观颗粒流模拟相结合的方法,研究了锚固段应力分布演化规律及其影响因素。锚固体的拉拔破坏过程可以分为3个阶段:黏弹阶段、黏脱阶段和破坏阶段。在黏弹阶段,剪应力呈先增后减的分布形式,峰值点靠近拉拔端孔口处;在黏脱阶段,拉拔端处的界面黏结首先失效,并向内部扩展,在此阶段,剪应力的峰值点随之向锚固段内部移动。锚杆和锚固剂弹性模量影响锚杆轴力和界面剪应力的分布形式,锚杆弹性模量越大,锚固剂弹性模量越小,剪应力在锚固段拉拔端的集中程度越小。
Through the combination of indoor experiment and mesoscopic particle flow simulation, the evolution of stress distribution and its influencing factors are studied. The process of drawing and breaking of anchor can be divided into three stages: viscoelastic stage, detachment stage and failure stage. At the viscoelastic stage, the shear stress first increases and then decreases, and the peak point is near the orifice of the drawing end. During the sticking-out phase, the interface bond at the drawing end firstly fails and expands to the inside. At this stage, The peak point of shear stress then moves to the inside of the anchoring section. The elastic modulus of anchor rod and anchoring agent affects the distribution of axial force and interfacial shear stress. The greater the elastic modulus of anchor rod, the smaller the elastic modulus of anchor agent, and the smaller the concentration of shear stress at the pull end of anchor segment.