汽车振动作用下含软弱层顺向桥基岸坡动力响应规律研究  

Study on dynamic response law of bank slope of bridge foundation with weak layer under vehicle vibration

作　　者：张敏[1] 剪鑫磊 毛东升 曾探 黄健[3] ZHANG Min;JIAN Xinlei;MAO Dongsheng;ZENG Tan;HUNAG Jian(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China;China National Petroleum Pipeline Engineering Co.,Ltd.,Langfang 065000,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031 [2]中国石油天然气管道工程有限公司,河北廊坊065000 [3]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都610059

出　　处：《成都理工大学学报（自然科学版）》2023年第5期577-587,共11页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：地质灾害防治与地质环境保护国家重点实验室开放基金(SKLGP2020Z007)。

摘　　要：研究汽车振动作用下斜坡岩土体动力响应及稳定性。以西南山区公路沿线常见的顺层边坡为研究对象,通过案例收集与特征统计,构建汽车振动作用下含软弱层顺向桥基岸坡地质概念模型;利用现场实测、时域和频域分析,对比数值模拟与实测结果,建立并确定了汽车振动的最优等效荷载模型;进而分析了汽车振动作用下岩土体加速度、应力和位移的动力响应特征,及其对边坡稳定状况的影响。结果表明:汽车振动引起边坡岩土体动力参数随距离衰减,且受软弱层显著影响,其中加速度和动位移表现为加速衰减,但动应力却出现局部升高现象。汽车振动作用下边坡稳定性系数会降低0.25(15%)。In this paper,the dynamic response and stability of rock and soil mass on the slope under the action of automobile vibration are studied by taking the common bedding slope along the highway in southwest mountainous area as the research object.Through case collection and feature statistics,a conceptual geological model of dip-bedding slope of bridge foundation with weak layer under vehicle vibration is constructed.Based on the field measurement,time domain and frequency domain analysis,the optimal equivalent load model of vehicle vibration is established and determined by comparing the numerical simulation results with the measured results.Then the dynamic response characteristics of rock mass acceleration,stress and displacement under automobile vibration are analyzed,and their effects on slope stability are also discussed.The results show that the dynamic parameters of rock and soil mass of slope are attenuated with distance due to automobile vibration,and are significantly affected by the weak layer.The acceleration and dynamic displacement are attenuated with acceleration,while the dynamic stress increases locally.Under the action of automobile vibration,the slope stability coefficient will be reduced by 0.25(15%),indicating that enough attention should be paid to the impact of vehicle vibration on the dip-bedding slope with weak-interlayer during the long-term service in mountainous expressways.

关 键 词：桥基岸坡 汽车振动 动力响应 稳定性 

分 类 号：P642[天文地球—工程地质学]