Anchoring effect and energy-absorbing support mechanism of large deformation bolt

To research the anchoring effect of large deformation bolt,tensile and drawing models are established.Then,the evolution laws of drawing force,bolt axial force and interfacial shear stress are analyzed.Additionally,the influence of structure element position on the anchoring effect of large deformation bolt is discussed.At last,the energy-absorbing support mechanism is discussed.Results show that during the drawing process of normal bolt,drawing force,bolt axial force and interfacial shear stress all gradually increase as increasing the drawing displacement,but when the large deformation bolt enters the structural deformation stage,these three values will keep stable;when the structure element of large deformation bolt approaches the drawing end,the fluctuation range of drawing force decreases,the distributions of bolt axial force and interfacial shear stress of anchorage section are steady and the increasing rate of interfacial shear stress decreases,which are advantageous for keeping the stress stability of the anchorage body.During the working process of large deformation bolt,the strain of bolt body is small,the working resistance is stable and the distributions of bolt axial force and interfacial shear stress are steady.When a rock burst event occurs,the bolt and bonding interface cannot easily break,which weakens the dynamic disaster degree.

采矿与力学相融合的创新实验项目建设与实践

创新实验教学项目的开发与建设是新时代全面推进创新教育的要求。基于采矿工程背景及力学实验技术,以实践创新技能培养为导向,以矿业类科研项目为依托,设计制作了顶板岩层移动相似模拟实验教学装置及地表沉陷三维相似模拟实验教学装置,成功建设了“煤炭开采顶板运动相似模拟实验”及“煤炭开采地表变形相似模拟实验”两项创新实验项目,初步形成了教研结合的实验教学模式。教学实践表明,学生对具有明显工程背景及开放性、挑战性更强的实验项目更感兴趣,增强和培养了学生的科研兴趣和力学应用能力。