不同地震强度下新型装配式锚索框架梁加固边坡抗震性能分析  

Seismic performance analysis of frame beams-reinforced slope under different earthquake intensities

作　　者：戴轩 马云祥 魏少伟 魏培勇 霍海峰 蔡德钩 李朝 DAI Xuan;MA Yunxiang;WEI Shaowei;WEI Peiyong;HUO Haifeng;CAI Degou;LI Zhao(College of Transportation Science and Engineering,Civil Aviation University of China,Tianjin 300300,China;Railway Engineering Research Institute,China Academy of Railway Sciences Group Co.,Ltd.,Beijing 100081,China;Beijing Tieke Special Engineering Technological Development Co.,Ltd.,Beijing 100081,China)

机构地区：[1]中国民航大学交通科学与工程学院,天津300300 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]北京铁科特种工程技术有限公司,北京100081

出　　处：《岩土工程学报》2023年第S02期147-152,共6页Chinese Journal of Geotechnical Engineering

基　　金：中国民航大学科研启动基金项目(2020KYQD39)。

摘　　要：装配式预应力锚索框架梁作为一种新型边坡加固方式,其抗震性能目前仍缺乏研究。针对采用“十字梁”与“一字梁”组合加固边坡,以实际工程为背景,建立了非线性动力时程分析数值模型。将El Centro波作为地震动输入,通过调幅分析了不同地震强度的影响规律。研究结果表明,装配式框架梁加固后边坡的滑坡体与基岩水平位移差明显降低,峰值加速度对滑坡体内测点水平位移的影响主要体现在残余变形阶段,边坡的震后永久位移随峰值加速度的增加而增加,且增速逐步加快;在不同峰值加速度下,边坡加速度的响应均出现一定的滞后作用,当峰值加速度较大时,边坡的加速度响应长期处于剧烈波动状态,加固后加速度放大系数最高可达8.0;地震时预制一字梁的梁底应力最大值明显大于预制十字梁,当峰值加速度为0.4g时,一字梁梁底有拉裂风险。As a new slope reinforcement method,the prefabricated prestressed anchor cable frame has been used in engineering.However,its seismic performance still needs to be studied deeply.Based on a practical project,a nonlinear dynamic time history numerical model is established for the reinforcement of slope by the combination of“cross beam”and“straight beam”using El Centro waves as the ground motion input.The influence rules of different earthquake intensities are analyzed through amplitude modulation.The results show that the horizontal displacement difference of the slope after the reinforcement of the frame beams decreases significantly.The influences of the peak acceleration on the horizontal displacement of the slope are mainly reflected at the residual deformation stage.The permanent displacement of the slope after earthquake increases with the increasing peak acceleration,and the growth rate is gradually accelerated.Under different peak accelerations,the slope acceleration response has a certain lag effect.When the peak acceleration is large,the slope acceleration response is in a state of drastic fluctuation for a long time.After reinforcement,the acceleration amplification coefficient can reach 8.0,and gradually decreases with the increase of earthquake intensity.The maximum stress at the bottom of the prefabricated cross beams is obviously smaller than that of the prefabricated straight ones.When the peak acceleration is 0.4g,the bottom of the frame beams has the risk of cracking.

关 键 词：装配式锚索框架结构 边坡加固 非线性动力分析 抗震性能 

分 类 号：TU432[建筑科学—岩土工程]