Resin grouted rock bolt support behaviour under shear loading

这项研究计划集中于确定钢筋螺栓的变形和强度行为，完全用环氧树脂粘结在岩石上。这些树脂注浆锚杆为钾矿中的巷道提供了支撑，这些巷道在沿粘土煤层的剪切和扩张运动的组合下会变形。钢筋螺栓因剪切变形而产生的载荷随剪切运动和伸缩运动的大小而变化。围岩提供的抗剪阻力也影响安装支架上的荷载。本研究由实验室部件、现场测试部件以及现场监测部件组成，该部件旨在测量钢筋对剪切载荷和变形的响应。这项工作的成功完成取决于对灌浆钢筋在荷载作用下的行为进行详细的测量。为了获得这些测量结果，将使用已证实的方法和实验方法相结合的方法来测量钢筋对剪切变形的载荷响应，使用应变计和粘结在钢筋上的光纤电缆。这项研究的成功完成将为矿山工程师提供将观测到的现场变形与支撑载荷联系起来的指导方针，这将有助于设计有效的地面支撑。

This research proposal focuses on determining the deformation and strength behaviour of rebar bolts, fully bonded to the rock with epoxy resin. These resin grouted bolts provide support for drift backs in potash mines, which can deform under a combination of shear and dilational movement along clay seams. The load that is induced on rebar bolts due to shear deformation varies with the magnitude of both shear and dilational movement. The resistance to shearing, provided by the adjacent rock mass, also influences the load on the installed support.This research consists of a laboratory component, field testing component as well as a field monitoring component designed to measure the response of rebar to shear loading and deformation. Successful completion of the work depends upon detailed measurements on the behaviour of the grouted rebar under load. To obtain these measurements, a combination of proven and experimental approaches will be used to measure the rebar load response to a shearing deformation using both strain gauges and fibre-optic cable bonded to the rebar. The successful completion of this research will provide the mine engineer with guidelines to relate observed field deformations with support loads, which will assist in the design of effective ground support.