| 岩石场地重力式挡土墙地震土压力振动台实验研究 |
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| 引用本文： | 焦方辉,姚令侃,蒋良潍,赵静.岩石场地重力式挡土墙地震土压力振动台实验研究[J].地震学刊,2011(3):316-322. |
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| 作者姓名： | 焦方辉 姚令侃 蒋良潍 赵静 |
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| 作者单位： | [1]西南交通大学土木工程学院,成都610031 [2]西南交通大学防灾减灾工程研究所,成都610031 |
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| 基金项目： | 铁道部科技研究开发计划课题项目（2008G010-A）资助 |
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| 摘 要： | 结合汶川震区调查资料,利用大型振动台模型试验,分析了碎石土填料的岩石场地重力式挡土墙的地震土压力及其分布规律,并以此对我国现行铁路、公路抗震规范做合理性讨论和细化。研究发现,地震作用下,挡土墙的动土压力沿墙高呈单峰曲线状分布,且60%～80%集中作用于挡墙中部;随着地震峰值加速度的增加,地震土压力分布逐渐偏离现行振震设计规范所认为的三角形线性状,而呈现非线性状;合力作用点高于1/3墙高,0.4g地震加速度作用下,接近0.4倍墙高,对岩石场地下粗粒径墙背填料的地震土压力作用点高度,建议取0.35倍墙高。对比计算表明,现行规范能基本满足工程抗震设计需要,但建议对柔性挡土墙的抗震设计作出必要规定。
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| 关 键 词： | 重力式挡土墙 地震土压力 振动台模型试验 抗震设计规范 |
Shaking Table Model Experimental Study on Seismic Soil Pressure of GRW on Rock Site |
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| JIAO Fang-hui,YAO Ling-kan,JIANG Liang-wei,ZHAO Jing.Shaking Table Model Experimental Study on Seismic Soil Pressure of GRW on Rock Site[J].Journal of Seismology,2011(3):316-322. |
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| Authors: | JIAO Fang-hui YAO Ling-kan JIANG Liang-wei ZHAO Jing |
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| Institution: | 1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China; 2.Research Institute of Hazard Prevention and Mitigation Engineering, Southwest Jiaotong University,Chengdu 610031,China) |
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| Abstract: | After the occurrence of a destructive earthquake,according to building and structure damage characteristics,it is important and imperative to revise the current seismic design codes.Combining with the seismic damage investigation in Wenchuan earthquake,this paper analyzes the seismic earth pressure of crushed gravel filled gravity retaining wall（GRW）and distribution of earth pressure by using large-scale shaking table model test.Based on the above analysis,reasonable discussion and refinement are made on current seismic design codes of railway and highway.The following conclusions are drawn.First the earth pressure on the GRW shows a single peak curve distribution along the wall and 60%～80%acting on the central.Second,with the increase of peak ground acceleration,the seismic earth pressure distribution gradually deviates from the triangular linear distribution.The acting point of resultant force is higher than 1/3 of the wall high,in fact,nearly 0.4 times the wall high under the action of seismic acceleration.On rock site with coarse wall back fill,it is suggested that the acting height of seismic earth pressure takes 0.35 times the wall height.Finally,comparative calculations show that current seismic design specifications can basically meet the project requirements,but it is suggested to make the necessary provisions about seismic design of flexible retaining walls. |
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| Keywords: | gravity retaining wall（GRW） earthquake soil pressure shaking table model test Code for aseismic design |
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