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岩性体振动裂隙扩展是路基、桥梁、振动施工和防震等领域共同关注的问题。通过自制惯性加载装置联合振动实验台,对12组含边中穿透裂隙的板状相似岩样进行振动加载试验,观测裂隙扩展和贯通规律,并利用PFC颗粒流软件建立试验对应模型,进一步分析裂隙扩展的控制机制。结果表明,不同区域振动变形的相位差会促进裂隙的扩展行为;边裂隙的起裂方向与振动方向夹角较小,约在±10°以内,且与振向相同的边裂隙最容易扩展,与振向相同的边—中裂隙对最容易贯通;破坏频率与裂隙间距呈正相关性,并且随着裂隙倾角和振向夹角的增大,裂隙扩展越来越困难,垂直振向的裂隙最难扩展;振动裂隙扩展路径为裂尖最近路线,符合能量最小原理。
Vibration crack propagation in lithology is a common concern in the fields of roadbed, bridge, vibration construction and earthquake prevention. Through self-made inertial loading device combined with vibration test rig, 12 sets of plate-like similar rock samples with side penetrating cracks were subjected to the vibration loading test and the crack propagation and penetration rules were observed. The corresponding experimental model was established by PFC particle flow software and further analyzed Crack expansion control mechanism. The results show that the phase difference of the vibration deformation in different regions can promote the propagation behavior of the fracture. The angle between the fracture initiation direction and the vibration direction of the side fracture is small, about ± 10 °, and the fracture with the same side edge is the easiest to expand. And the same side-to-center fissure pair is most easily penetrated. The failure frequency is positively correlated with the fissure spacing, and as the fissure angle and the included angle increase, it becomes more and more difficult for the fissure to expand. Difficult to expand; Vibration crack expansion path for the crack tip of the recent route, in line with the principle of energy minimum.