空间锚索抗滑桩工作性能大型振动台试验研究  

Study on Performance of Bedrock Slope with Space Anchor Cable Anti-Slide Piles Based on Large Shaking Table Test

作　　者：连静 丁选明[2] 温浩 马洪生 瞿立明 LIAN Jing;DING Xuanming;WEN Hao;MA Hongsheng;QU Liming(School of Architecture and Civil Engineering,Xihua University,Chengdu 610039,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Sichuan Provincial Transport Department Highway Planning,Survey,Design and Research Institute,Chengdu 610041,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西华大学建筑与土木工程学院,四川成都610039 [2]重庆大学土木工程学院,重庆400045 [3]西南交通大学土木工程学院,四川成都610031 [4]四川省交通运输厅公路规划勘察设计研究院,四川成都610041 [5]西南交通大学地球科学与环境工程学院,四川成都610031

出　　处：《铁道学报》2024年第12期146-153,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(52208370,52078426)。

摘　　要：为解决地震频发下边坡支挡结构抗震设计难题,设计新型支挡结构-空间锚索抗滑桩与普通锚索抗滑桩的同源地震大型振动台模型试验,从受力传递机制、坡面变形、桩身位移及锚索内力四个方面对空间锚索抗滑桩系统的工作性能进行研究。结果表明:空间锚索抗滑桩结构的锚固体横向布置,利用围岩强度提供抗滑力,单根锚固体可为多根抗滑桩提供抗力。在地震和重力的作用下,空间锚索抗滑桩系统的破坏模式为覆盖层向下滑动、桩身变形→横向锚固体挤压围岩、基岩强度发挥→锚固体围岩损伤加剧、桩身变形增大→围岩突发破坏、锚索抗滑桩系统失效,与普通锚索抗滑桩系统存在差异。普通/空间锚索抗滑桩所允许的坡面后缘开裂临界地震动强度为0.4g/0.6g、坡面前缘开裂的临界地震动强度为0.8g/1.0g,而空间锚索抗滑桩系统的锚索总长度较普通锚索抗滑桩系统则减少了30%,充分说明空间锚索抗滑桩的抗震性能优于普通锚索抗滑桩,经济效益和社会价值显著。In order to address the challenging issue of seismic design for slope support structures under frequent earthquakes,a large-scale shaking table model test was designed and completed for the traditional anchor cable anti-slide pile structure and novel type of support structure-space anchor cable anti-slide pile structure based on homologous earthquakes.The working performance of space anchor cable anti-slide pile system was demonstrated from four aspects,including the force transfer mechanism,slope deformation,pile displacement and anchor cable internal force.The results show that the space anchor cable anti-slide pile structure can provide anti-sliding force through the lateral layout by using the strength of surrounding rock,with a single anchorage body providing anti-sliding force for multiple anti-sliding piles.Under the action of earthquakes and gravity,the failure mode of overburden layer and bedrock slope with space anchor cable anti-slide pile system is basically the same.The failure mode is in the process of overlays sliding down deformation of the pile lateral anchor solid extrusion enclosure,bedrock strength playing a role increased damage to the anchor solid envelope and increased pile deformation sudden damage to the surrounding rock and occurrence of failure of the anchor cable anti-slip pile system,which is different from the failure mode of overburden layer and bedrock slope with traditional anchor cable anti-slide pile system.The allowed critical seismic intensity of cracking at the rear edge of the slope is 0.4 g and 0.6 g for traditional anchor cable anti-slide pile and space anchor cable anti-slide pile respectively.The critical seismic intensity of cracking at the front edge of the slope is 0.8 g and 1.0 g for traditional anchor cable anti-slide pile and space anchor cable anti-slide pile respectively.However,the space anchor cable anti-slide pile structure reduces 30%use of anchor cable compared with the traditional anchor cable anti-slide pile structure.This fully demonstrates that,compared

关 键 词：覆盖型边坡 空间锚索抗滑桩 工作性能 振动台试验 

分 类 号：P642[天文地球—工程地质学]