Soil Nailing and Geosynthetic Reinforcement for Seismic Loads

* Michalowski 9634193在过去几年中，随着美国和日本发生重大地震事件，人们对加筋土结构的兴趣有所增加。加筋土结构在地震中表现良好，几乎没有结构性破坏。 本项目旨在对此类结构进行稳定性分析。土钉支护和土工合成材料加固被认为是，地震荷载，作为模式的基础加速度，占。 两个主要目标是：（a）在理解土壤加固机制方面取得进展，包括一些“非传统”的合成加固物，如细连续纤维，以及（B）发展分析和合成用土钉或土工合成材料加固的土壤结构的技术，并以有益于设计实践的方式展示结果。 分析是基于塑性理论的定理。通过在能量平衡方程中加入额外的功耗散项，可以考虑土钉或土工合成材料的贡献。本文研究了粒状土塑性流动的非结合性对稳定性分析结果的影响。所考虑的结构荷载包括自重、作为边界荷载施加的力以及由于地震加速度（基础震动）而产生的惯性力。 这项研究将有助于在该地区的知识状态，通过发展一种新的分析稳定性的土钉或土工合成材料加固结构，并通过发展一种新的方法来建模的土壤与连续线程（长丝）。对工程设计实践也有一定的参考价值。将努力创建有用的设计图表。

*** Michalowski 9634193 There has been an increase in interest in reinforced soil structures following the major seismic events in the U.S. and in Japan in the last few years. Reinforced soil structures appear to have performed very well during earthquakes, and showed little structural distress. This project addresses the stability analysis of such structures. Both soil nailing and geosynthetic reinforcement are considered, and seismic loads, given as patterns of base acceleration, are accounted for. Two major objectives are: (a) progress in understanding of soil reinforcement mechanisms, including some "non-traditional" synthetic reinforcement such as thin continuous filament, and (b) development of techniques for analysis and synthesis of soil structures reinforced with soil nails or geosynthetics, and presenting results in a manner useful for design practice. The analysis is based on the theorems of plasticity theory. The contribution of soil nails or geosynthetics are accounted for through inclusion of additional work dissipation terms in the energy balance equation. An effort is made to investigate the influence of non-associativity of plastic flow of granular soils on the results of the stability analysis. The structural loads considered include self-weight, forces applied as boundary loads, and inertial forces due to seismic acceleration (base shaking). This research will contribute to the state of knowledge in the area through development of a new analysis for stability of soil-nailed or geosynthetic-reinforced structures, and through development of a new approach to modeling of soils reinforced with continuous thread (filament). It will also contribute to engineering design practice. An effort will be made to create useful design charts.