【摘要】 利用MTS岩石力学试验机和自主研发的加载装置,进行集中荷载作用下,岩板断裂铰接成拱过程及其失稳特征的试验研究,得到竖向荷载-位移-水平反力关系曲线。试验结果表明:随着竖向荷载的不断增大,岩板梁式断裂后铰接形成拱形结构,并在铰接点产生水平反力。在竖向荷载和水平反力的共同作用下,竖向荷载-位移-水平反力关系曲线存在4个明显的力学响应阶段:加载前应力调整、岩板断裂铰接成拱、岩拱结构承载的峰前硬化和峰后软化4个阶段。基于岩板铰接拱结构工程力学模型,推导出岩拱结构承载力与水平反力关系式,并进行岩拱结构受力随岩板参数变化的敏感性分析。更多还原

【Abstract】 The instability characteristics of the fracture hinged arch for rock plates were researched experimentally with the independent researched loading device based on MTS rock mechanics test system under concentrated load condition;and vertical load-displacement-horizontal reaction force curves were obtained through the experiments.The experimental results show that rock plate fractured in beam style and formed hinged arch with the increasing vertical load;at the same time,horizontal reaction forces generated at these hinge points.There are four distinct mechanical response stages in the vertical load-displacement-horizontal reaction force curves,which are initial adjustment before loading,rock plate fracture and forming hinged arch,pre-peak hardening and post-peak softening of rock arch load bearing.Based on the engineering mechanical model of hinged arch structure of rock plate,the relationship formula for bearing capacity and horizontal reaction force of rock arch structure is deduced;and the sensitivity analysis of load bearing of rock arch structure changing with rock plate parameters is conducted.更多还原