Using the digital image correlation method and the four-point bending loading method,the research work was carried out respectively from the bond and non-bond tests of double composite rock beams.The evolution processes of deformation field and energy field in the whole process of double rock beams under different conditions were studied and analyzed.The bearing capacity,interlayer slip and energy change of bonded and unbonded rock beams were compared and analyzed to explore the seismic-induced mechanism of interlayer slip in bending deformation of layered rock mass.The results show that:(1)the bearing capacity of bonded composite beams is greater than that of unbonded composite beams,while one rock beam does not completely lose its bearing capacity after fracture,which continues to resist external forces with the other rock beam.(2)The bonded rock beam behaves as a whole and breaks once after being stressed..The unbonded composite rock beam moves independently due to the influence of interlayer sliding,and the fracture times are the same as the number of layers of the rock beam.It proves that the rock strata with interlayer constraint will have only one mine earthquake,while the rock strata without interlayer constraint will have multiple mine earthquakes.(3)The bonded composite rock beam stores more energy,which leads the damage greater when this energy is released at fracture.The energy storage of unbonded rock beams is small.The energy is released one time when the upper or lower beams are broken,which is less harmful.
关键词
矿震/组合岩梁/弯曲变形/变形破坏/能量演化
Key words
mineral earthquakes/composite rock beams/bending deformation/deformation destruction/energy evolution
维普
万方数据