Effect of bedding plane parameters on dynamic failure process of sliding rock slopes
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摘要: 建立3组含有非完全贯通层面和正交次级节理的顺层岩质边坡数值模型,运用FLAC/PFC2D耦合计算方法进行了地震动力破坏过程模拟试验。试验结果证明：非贯通层面部分在水平地震动力作用下,同时存在张拉和剪切两种破坏模式。非贯通层面部分的强度和层面贯通率对顺层边坡地震动力稳定性的影响十分明显,控制着边坡产生破坏的临界地震动力输入幅值以及产生破坏后边坡的破坏范围大小。贯通层面部分的抗剪强度（即贯通层面的摩擦角）对边坡地震动力稳定性和破坏范围的影响很小,只有在顺层边坡内部所有岩层层面均完全贯通的前提下才能转变为边坡稳定性主控因素。
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关键词:
- 顺层岩质边坡 /
- 非贯通层面 /
- 地震 /
- FLAC/PFC2D耦合计算 /
- 动力稳定性
Abstract: Three groups of FLAC/PFC2D hybrid numerical models for sliding rock slopes with intermittent bedding planes and orthogonal secondary rock joints are established, and their seismically induced failure processes are simulated and analyzed. The simulated results reveal that the unbroken parts of the rock bedding planes fail in both tension and shear even when the rock slope is under solely horizontal seismic load. Moreover, the strength and penetration rate of the unbroken rock bedding planes affect the dynamic stability of the slope significantly, and they mainly serve to control the critical dynamic load to induce failure event of the rock slope and the scale of the failure. To the contrary, the shear strength (friction angle) of the broken parts of the bedding planes barely affect the failure process of the rock slope, yet they may occupy the controlling position only when there are no unbroken parts inside the bedding planes. -
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