【作者】 陈华；

【导师】 周亦唐； 白良；

【作者基本信息】 昆明理工大学 ， 道路与铁道工程， 2002， 硕士

【摘要】 首先，本文介绍了土工加筋技术的广阔应用前景和塑料土工格栅加筋土挡墙的优越工程特性，系统分析研究了加筋土及加筋土挡墙的工作机理和计算设计理论，总结了国内外在加筋土支挡结构动力行为特性方面的研究成果，提出研究地震作用下塑料土工格栅加筋土挡墙动力行为特性的必要性和采用有限元时程分析方法研究塑料土工格栅加筋土挡墙的优越性。 然后，根据设计的塑料土工格栅加筋土挡墙实验模型，采用有限元时程分析方法分析了地震作用下模型加筋土挡墙的非线性动力行为特性，有限元分析结果揭示了模型加筋土挡墙的一些动力行为规律，为下一步深入进行塑料土工格栅加筋土挡墙模型实验研究奠定了基础。 最后，根据有限元分析结果，提出土工格栅加筋土挡墙中加筋材最大拉力点的连线，即潜在滑裂面的形状基本不受地震作用力的影响，由地震引起的水平地震荷载可简化为一附加在滑动楔体上的水平惯性力，由各层加筋材按与其锚固长度成正比的关系分担，在此基础上提出了一种计算土工格栅加筋土挡墙中加筋材动拉力的简化方法。 本文提出的有限元方法分析土工格栅加筋土挡墙动力行为的方法及其结果，一旦得到下一步模型实验证实，将对制定土工格栅加筋土挡墙设计规范地震荷载部分有一定的参考价值。更多还原

【Abstract】 In this thesis, firstly, the engineer advantage of Geogrid Reinforced Earth walls is introduced, and the working mechanism and the calculation method of Geogrid Reinforced Earth wall are analysed. Recent developments on Reinforced Earth walls under seismic excitation in our country and on the world are presented. The necessity of researching Geogrid Reinforced Earth wall under seismic excitation and the advantage of researching Geogrid Reinforced Earth walls with Seismic Finite Element Analysis Method are proposed.Secondly, a small scale Geogrid Reinforced Earth wall experimental model is designed, and its nonlinear seismic behavior under seismic excitation is analysed by Seismic Finite Element Analysis Method. The analysis results discover some seismic response laws of Geogrid Reinforced Earth wall under seismic excitation. It is a good base of deeply researching Geogrid Reinforced Earth wall under earthquake.Finally, According to the analysis results of small scale Geogrid Reinforced Earth wall model by Seismic Finite Element Analysis Method, the author proposes that the maximum stress points line, i. e. potential collapse face, keep unchanged in shape regardless of the magnitude of vibration, the horizontal earthquake force can be simply considered as a horizontal inertia of the collapse wedge, and the seismic stress increment is distributed among the different layers of geogrid proportional to their resistant lengths. Furthermore, a simple method of calculating the seismic stress increment of the different geogrid reinforced layers is concluded and recommended based on this idea.The method of Finite Element Analysis for Geogrid Reinforced Earth walls and the conclusions (got by Finite Element Analysis) are referable to the preparation for design specification of Geogrid Reinforced Earth walls subjected to seismic loadings.更多还原