论文部分内容阅读
浅埋采空区顶板变形破坏过程与灾变机理研究,是目前下伏采空区建(构)筑物工程实践中急待解决的难题。针对国内外在岩板变形破坏试验中存在的不足,自行研发了能够进行岩石类材料矩形板弯曲试验的加载装置。利用MTS岩石力学试验机和研发的加载装置,对单层岩板断裂铰接成拱的过程及其失稳机理进行了分析,并对双层组合岩板进行了变形破坏过程的试验研究。试验结果表明:随着施加荷载的不断增大,单层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。双层组合岩板的上层板存在梁式断裂、拱形破坏和板式断裂破坏3种破坏模式。单层岩板和双层岩板的荷载-位移全过程曲线,均存在4个明显的力学响应阶段,并由该曲线分析了岩拱结构形成过程及其失稳的特征。
The research on roof deformation and failure mechanism and disaster mechanism in shallow gob-side is an urgent problem to be solved in the construction of under-gird building. Aiming at the shortcomings in the deformation and failure test of rock slab at home and abroad, a loading device capable of carrying out the bending test of the rectangular plate of rock material has been developed. The MTS rock mechanics testing machine and the developed loading device were used to analyze the process and the instability mechanism of the single - layer rock fracture hinged arch, and the experimental study on the deformation and failure process of the two - layer composite rock slab was carried out. The experimental results show that with the increase of applied load, the arched structure is formed after the single-layer rock-beam fracture, and the horizontal reaction force is produced at the hinge point. There are three kinds of failure modes of the upper deck of the double-layer composite rock plate: beam fracture, vault fracture and plate fracture failure. There are four distinct stages of mechanical response in the whole load-displacement curve of single-layer rock and double-layer rock, and the formation process of rock-arch structure and the characteristics of its instability are analyzed by this curve.