【作者】 许纯；

【导师】 姚纬明；

【作者基本信息】 河海大学 ， 水工结构工程， 2006， 硕士

【摘要】 加筋土是一种在土中加入加筋材料而形成的复合土。加筋土结构作为一种新兴的土工结构,以其造型美观、施工方便、节省造价、适应性强等优点,在世界范围内得到了广泛的应用与快速的发展,甚至出现了理论研究落后于实践的情况。 本文研究内容为刚性拉筋的条带式加筋土挡墙非线性有限元分析。计算中材料本构关系采用Duncan-Chang的E-V模型;在筋土之间、面板与填土之间引入Goodman界面单元,以模拟不同材料之间的剪切滑移作用。 通过对工程实例—深圳河整治加筋土挡墙的二维有限元计算,分析了挡土墙的侧向变形、填土沉降以及筋带拉力、面板侧压力的分布规律。将有限元结果同现场监测结果相互对比,验证了所采用的材料本构模型、界面单元及建模思路的正确性。讨论了由朗金法、规范的0.3H法、有限元法和现场监测结果确定的破裂面的形状以及滑动区的范围。 通过对工程算例的三维有限元计算,探讨了条带式加筋土挡墙三维有限元计算的可行性,并指出今后值得研究的方向。 通过加筋土挡墙在几种工况下的二维有限元计算,分析了不同的模拟施工层数对计算结果的影响及不同拉筋长度、不同布筋间距对加筋效果的影响。为今后对条带式加筋土挡墙的数值模拟分析以及在设计过程中对拉筋长度、布筋间距的选择上提供了参考依据。更多还原

【Abstract】 Reinforced earth is composite which is composed by reinforced material into soil. As a rising earth structure with many merit such as beautiful shape, easer conformable, save cost, and be conformable with any terrain, etc, the reinforced earth-retaining wall is being used in more and more fields and having received fast development. Even now the research on theory drops behind the construction.In this paper, a rigid striped reinforcement of reinforced earth-retaining wall is analysed by nonlinear finite element methods. The material’s constitutive model is Duncan-Chang E-V model. Between striped reinforcement and soil, facing and soil, Goodman element is introduced to simulate the effect between them.Through the calculation to the Shen Zhen He river reinforced earth-retaining wall by FEM, the regularities of distribution of the lateral displacement, fill settlement, striped reinforcement tensile force and lateral facing pressure are analysed. These results are contrast with the scene monitoring to certificate the computational method’s validity, the rational of material’s constitutive model and interface element. Discuss the different shape of the fill’s fracture plane and the sliding rang, which is calculated by Rankine’s earth pressure theory, 0.3H method in specification, FEM and scene monitoring.Discuss the feasibility of the 3-D FEM calculating to the reinforced earth-retaining wall. And a valuable research aspect is advanced.Different fill lays, different reinforcement length, different space between reinforcements do effect on the calculation. So several work conditions are dong to analyse the influence. And the results provide feference for numerical simulation and word design.更多还原