覆盖型边坡-锚索抗滑桩动力学特征演化规律与成因机制的大型振动台试验研究  

Study of Large Shaking Table Test on Evolution of Dynamic Characteristics and Formation Mechanism of Bedrock and Overburden Layer Slope with Stabilizing Piles and Anchor Cables

作　　者：连静 温浩 童心豪 张凯文 马洪生 LIAN Jing;WEN Hao;TONG Xinhao;ZHANG Kaiwen;MA Hongsheng(School of Civil Engineering,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu 610041,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]西南交通大学土木工程学院,四川成都610031 [3]四川省公路规划勘察设计研究院有限公司,四川成都610041

出　　处：《铁道学报》2024年第9期156-163,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(52078426);国家重点研发计划(2018YFE0207100);四川省交通运输科技项目(2020-A-01);四川省科技计划(2020YJ0253)。

摘　　要：设计完成覆盖型边坡-锚索抗滑桩系统的大型振动台试验,从加速度场、覆盖层-基岩交界面、覆盖层内部以及覆盖层表面四个维度对覆盖型边坡动力学特征演化机制进行系统研究。结果表明:地震动作用下,坡体后缘和坡面形状转折区域首先出现浅层局部破坏,随后覆盖层后缘出现拉伸开裂破坏,不断向深部扩展,覆盖层-基岩交界面上的剪切破坏点逐渐向覆盖层中前部的锁固段扩展,后缘覆盖层向前挤压诱发深层整体滑动,最终滑体从剪出口滑出形成滑坡;临空面方向、竖直方向峰值加速度具有明显趋表放大效应且随高程增加逐渐增强,在坡面转折处和覆盖层后缘易出现加速度集中区;地震动强度较小时,临空面方向峰值加速度放大系数分布近似与坡面的几何形状一致,随着地震动强度增大,覆盖层-基岩交界面贯通后,临空面方向、竖直方向加速度放大效应在覆盖层表面呈对称分布。覆盖型高陡边坡进行支挡结构抗震设计时,建议按照水平安评地震动峰值的3~4倍和竖向安评地震动峰值的2~3倍对坡面转折处防护结构进行局部加强设计。A seismic simulation shaking table test on bedrock and overburden layer slope retaining with stabilizing piles and anchor cables was designed and completed.The evolution mechanism of the dynamic characteristics of bedrock and deep overburden slope was systematically studied from the four aspects of the acceleration field,the overburden and bed-rock interface,the interior of overburden layer and the surface of the overburden layer.The results show that under the seismic action,the shallow local failure occurs on the edge and the transition area of the slope surface,followed by ten-sile cracking failure on the edge of the overburden layer,with continuous expansion to the depth of the slope.The shear failure on the interface between the overburden layer and the bedrock gradually expands to the locking section in front of the overburden layer.The forward extrusion of the trailing edge of the overburden layer induces the deep overall sliding of the overburden layer,until eventually the sliding body slides out from the shear outlet to form a landslide.The peak ac-celeration in the direction of air surface and vertical direction has a significant surface amplifying effect,which gradually increases with the elevation.The acceleration concentration areas appear at the turning point of the slope surface and the posterior edge of the overburden layer.When the intensity of ground motion is small,the distribution of peak acceleration amplification coefficient in the direction of air surface is approximately consistent with the geometry of the slope surface.With the increase of ground motion intensity,with the penetration of the interface between the overburden layer and the bedrock,the acceleration amplification effect in the direction of the air surface and the vertical direction shows the sym-metrical distribution law on the overburden surface.In the seismic resistant design of the retaining structure of high steep slope with bedrock and deep overburden layer,the retaining structure at the turning point of the slope surface

关 键 词：基覆型边坡 振动台试验 动力学特征 演化规律 成因机制 

分 类 号：U213[交通运输工程—道路与铁道工程]