锚索抗滑桩加固边坡震害机理分析  

Seismic damage mechanism of slopes reinforced by anchor sheet-pile wall

作　　者：曲宏略[1] 朱梦佳 董望旺 罗浩 QU Honglue;ZHU Mengjia;DONG Wangwang;LUO Hao(School of Geoscience and Technology,Southwest Petroleum University,Chengdu 610500,Sichuan,China)

机构地区：[1]西南石油大学地球科学与技术学院,四川成都610500

出　　处：《地震工程学报》2024年第5期1001-1008,1020,共9页China Earthquake Engineering Journal

基　　金：战略性国际科技创新合作重点专项(2018YFE0207100);四川省自然科学面上基金(2023NSFSC0281)。

摘　　要：锚索桩板墙具有优良的抗震效果,以往研究集中于边坡位移、锚索应力和抗滑桩的变形,很少从边坡内部监测地震波入手研究,难以在时频域内清楚地表征边坡内部的损伤特征。基于此,文章设计并完成几何相似比为1∶10的大型振动台试验,结合Hilbert-Huang Transform(HHT)方法,对锚索桩板墙加固边坡进行边坡损伤诊断和震害机理研究。结果表明:边坡破坏从滑面开始,随着地震峰值加速度的增大,坡面产生破坏的时间早于坡体内部,并逐步向低高程发展;锚索桩板墙可以充分发挥锚索对地震力的传递与抗滑桩对地震力的耗散作用,靠近锚索抗滑桩一侧坡体破坏滞后于远离抗滑桩一侧,且靠近锚索桩板墙一侧土体整体性明显更好;HHT方法边际谱特征频率和特征幅值可以清晰表征坡体损伤过程,基岩与坡体之间存在动力响应不连续带,即为设计滑面位置。这为进一步认识地震波在坡体内的传播机理,研究边坡的破坏过程提供理论依据。The anchor sheet-pile wall is known for its excellent anti-seismic properties.Previous research has focused on the slope displacement,anchor stress,and deformation of anti-slide piles,often neglecting the monitoring of seismic waves within the slope.This gap makes it difficult to clearly characterize the damage characteristics inside the slope in the time-frequency domain.To address this,a large-scale shaking table test with a geometric similarity ratio of 1∶10 was designed and conducted.Using the Hilbert-Huang Transform(HHT)method,this paper analyzes the seismic damage diagnosis and mechanism of slopes reinforced by an anchor pile-sheet wall.The results reveal that the slope failure starts from the sliding surface.As the peak ground acceleration increases,surface failure of the slope occurs earlier than internal failure and gradually develops to lower elevations.The anchor sheet-pile wall effectively transmits seismic forces through the anchor cable and dissipates these forces via the anti-slide pile.The slope failure near the side of the anchor cable anti-slide pile lags behind that farther from the anti-slide pile,and the soil integrity near the side of the anchor sheet-pile wall is obviously better.The characteristic frequency and amplitude of the marginal spectrum using the HHT method can clearly characterize the slope damage process.A dynamic response discontinuity exists between the bedrock and the slope,marking the design sliding surface's position.This study provides a theoretical basis for further understanding the propagation mechanism of seismic waves in the slope and studying the failure process of the slope.

关 键 词：锚索桩板墙 振动台试验 HHT 震害机理 

分 类 号：TU435[建筑科学—岩土工程]