锚杆支护顺层岩体边坡地震动破坏分析
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摘要
运用FLAC3D探讨了地震作用下顺倾层状岩体边坡软弱夹层参数(数量S、间距D、厚度H和倾角α)对边坡稳定性与锚杆轴力的影响。研究表明:地震作用下顺倾层状岩体边坡仅沿某一软弱夹层以倾倒-滑移的破坏模式失稳破坏,软弱夹层参数的改变并不会改变其破坏模式和主要破坏面位置;S、H越大,地震作用下坡面永久位移和锚杆轴力越大,D、α越大,永久位移和锚杆轴力越小;轴力沿杆身呈"山峰"式分布,主软弱夹层处"峰值"最高;研究可为地震作用下多层软弱夹层边坡的支护和抗震设计提供有益参考。
The influence of the soft intercalation parameters(number S, spacing D, thickness H and inclination angle α) of the sloped layered rock mass on the stability of the slope and the axial force of the anchor is discussed by using FLAC~(3D). The research shows: Under the action of earthquake, the slope of the sloping layered rock mass only destabilizes under the failure mode of dumping-slip along a weak interlayer and changes in the parameters of the weak interlayer do not change the failure mode and the main failure surface position. The greater the S and H, the greater the permanent displacement and axial force of the slope under the action of earthquake, the larger the D and α, the smaller the permanent displacement and axial force. The axial force is distributed along the shaft in a "mountain peak" type, and the "peak" is the highest at the main weak interlayer. The research can provide a useful reference for the support and seismic design of multi-layer weak interlayer slope under earthquake action.
The influence of the soft intercalation parameters(number S, spacing D, thickness H and inclination angle α) of the sloped layered rock mass on the stability of the slope and the axial force of the anchor is discussed by using FLAC~(3D). The research shows: Under the action of earthquake, the slope of the sloping layered rock mass only destabilizes under the failure mode of dumping-slip along a weak interlayer and changes in the parameters of the weak interlayer do not change the failure mode and the main failure surface position. The greater the S and H, the greater the permanent displacement and axial force of the slope under the action of earthquake, the larger the D and α, the smaller the permanent displacement and axial force. The axial force is distributed along the shaft in a "mountain peak" type, and the "peak" is the highest at the main weak interlayer. The research can provide a useful reference for the support and seismic design of multi-layer weak interlayer slope under earthquake action.
引文
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[8]郝建斌,郭进扬,张振北,等.地震作用下锚杆支护边坡动力响应[J].交通运输工程学报,2017,17(3):46-55.
[2]董金玉,杨国香,伍法权,等.地震作用下顺层岩质边坡动力响应和破坏模式大型振动台试验研究[J].岩土力学,2011,32(10):2 977-2 982,2 988.
[3]杨国香,伍法权,董金玉,等.地震作用下岩质边坡动力响应特性及变形破坏机制研究[J].岩土力学与工程学报,2012,31(4):696-702.
[4]尤春安,战玉宝.预应力锚索锚固段的应力分布规律及分析[J].岩石力学与工程学报,2005,24(6):925-928.
[5]姚显春,李宁,陈蕴生.隧洞中全长粘结式锚杆的受力分析[J].岩石力学与工程学报,2005,24(13):2 272-2 276.
[6]尤春安.全长粘结式锚杆的受力分析[J].岩石力学与工程学报,2000,19(3):339-341.
[7]叶海林,郑颖人,陆新,等.边坡锚杆地震动特性的振动台试验研究[J].土木工程学报,2011,44(S1):152-157,176.
[8]郝建斌,郭进扬,张振北,等.地震作用下锚杆支护边坡动力响应[J].交通运输工程学报,2017,17(3):46-55.