地震作用下锚索框架梁边坡的振动台模型试验研究
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摘要
以海西福永高速公路某标段预应力锚框支护土岩二元结构边坡工程为依托,通过模型试验法在大型振动台作用下对锚索-框架梁支护下的土岩二元结构边坡的地震响应规律进行了研究。结果表明:沿坡高方向向上,PGA放大系数呈递增趋势,表现出明显的"趋表效应"和"鞭梢效应";地震强度等级较高情况下,土体的塑性特征非常明显;地震波频谱特征不同导致加速度峰值放大系数存在差异并随坡高变大而呈现变小的趋势,最终在边坡坡顶处逐渐趋于一致。
Based on the soil-rock dual structural slope supported by prestressed anchor-frame in a section of Fuzhou—Yongtai Highway in West-straits Economic Zone, the seismic response law of the slope was studied by large-scale shaking table model test. The result shows that, when going up along the slope elevation, PGA amplification factor shows an increasing trend with obvious‘skin effect'and‘whipping effect'; in case of relatively high earthquake intensity scale, the soil mass exhibits distinct plastic characteristics; due to the different spectrum features of seismic wave, PGA amplification factor has discrepancies and trends to be smaller as the slope elevation increases, and then gradually converged towards the slope top.
Based on the soil-rock dual structural slope supported by prestressed anchor-frame in a section of Fuzhou—Yongtai Highway in West-straits Economic Zone, the seismic response law of the slope was studied by large-scale shaking table model test. The result shows that, when going up along the slope elevation, PGA amplification factor shows an increasing trend with obvious‘skin effect'and‘whipping effect'; in case of relatively high earthquake intensity scale, the soil mass exhibits distinct plastic characteristics; due to the different spectrum features of seismic wave, PGA amplification factor has discrepancies and trends to be smaller as the slope elevation increases, and then gradually converged towards the slope top.
引文
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[2] 李树德,任秀生,岳升阳,等.地震滑坡研究[J].水土保持研究,2001,8(2):24-25.LI S D,REN X S,YUE S Y,et al.Study of earthquake-landslide[J].Research of Soil and Water Conservation,2001,8(2):24-25.
[3] LIN M L,WANG K L.Seismic slope behavior in a large-scale shaking table model test[J].Engineering Geology,2006,86(2/3):118-133.
[4] 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):2977-2982,2988.DONG J Y,YANG G X,WU F Q,et al.The large-scale shaking table test study of dynamic response and failure mode of bedding rock slope under earthquake[J].Rock and Soil Mechanics,2011,32(10):2977-2982,2988.
[5] 郑颖人,叶海林,黄润秋,等.边坡地震稳定性分析探讨[J].地震工程与工程振动,2010,30(2):173-180.ZHENG Y R,YE H L,HUANG R Q,et al.Study on the seismic stability analysis of a slope[J].Journal of Earthquake Engineering and Engineering Vibration,2010,30(2):173-180.
[6] 叶海林,郑颖人,黄润秋,等.锚杆支护岩质边坡地震动力响应分析[J].后勤工程学院学报,2010,26(4):1-7.YE H L,ZHENG Y E,HUANG R Q,et al.Analysis on dynamic response of rockbolt in rock slope under earthquake[J].Journal of Logistical Engineering University,2010,26(4):1-7.
[7] 叶海林,郑颖人,李安洪,等.地震作用下边坡预应力锚索振动台试验研究[J].岩石力学与工程学报,2012,31(增刊1):2847-2854.YE H L,ZHANG Y R,LI A H,et al.Shaking table test studies of prestressed anchor cable of slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(S1):2847-2854.
[8] 邓涛,林翔,柳志鹏,等.漳永高速公路高边坡地震动力响应及稳定性分析[J].路基工程,2016(6):45-49.DENG T,LIN X,LIU Z P,et al.Seismic dynamic response and stability analysis for the high slope of Zhangzhou-Yongan expressway[J].Subgrade Engineering,2016(6):45-49.
[9] 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].岩石力学与工程学报,2012,31(4):696-702.YANG G X,WU F Q,DONG J Y,et al.Study of dynamic response characters and failure mechanism of rock slope under earthquake[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(4):696-702.