窄加勁擋土牆的破壞機制與基於變形之設計方法;Failure mechanism and deformation - based - design of narrow geosynthetic reinforced earth walls

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题名:	窄加勁擋土牆的破壞機制與基於變形之設計方法;Failure mechanism and deformation - based - design of narrow geosynthetic reinforced earth walls
作者:	Phuong, Pham Truong Nhat;Pham, Truong-Nhat-Phuong
贡献者:	土木工程學系
关键词:	加勁擋土牆;單邊回包式窄加勁擋土牆;雙邊回包式窄加勁擋土牆;破壞行為;側向土壓力;變形設計;水平位移;折減因子;mechanically stabilized earth wall;geosynthetic reinforced earth wall;single-facing narrow GRE wall;double-facing narrow GRE wall;failure behavior;lateral earth pressure;deformation-based-design;horizontal displacement;reduction factor
日期:	2019-12-26
上传时间:	2020-01-07 14:21:53 (UTC+8)
出版者:	國立中央大學
摘要:	近年來，對加勁擋土牆的行為及破壞機制之相關研究豐碩。加勁擋土牆具有良好的穩定性，亦可容許較大變形。在空間有限的情況下，例如在山區或沿海地區需拓寬道路面積時，可以通過調整加勁材的長度建造合適的加勁擋土牆取得額外用地。調整加勁材的強度、間距、長寬比以及配置會影響加勁擋土牆的行為，亦會改變牆背的側向土壓力分佈。本研究中，透過一系列之地工離心模型試驗，探討窄加勁擋土牆（GRE）的破壞行為、牆背側向土壓力分佈以及變形機制。試驗結果中得到之側向土壓力、零土壓力區（zero-earth-pressure zone）與水平位移之間的關係，可應用於預測窄加勁擋土牆的變形。本研究建立一套以變形量設計窄加勁擋土牆之方法 (deformation – based -design)，且根據試驗結果簡化設計窄加勁擋土牆時所需之計算過程，於實務上應用時，可預測加勁材的行為 (progressive behavior)，並提供大地工程師一套好用且精準之設計方法。 ;In recent years, the working performance of mechanically stabilized earth (MSE) walls has shown their outstanding stability and capacity to accommodate large deformation. The behaviors and failure mechanisms of conventional MSE walls have been carefully examined. In case where space is limited, such as mountainous regions, for coastline protection, or road expansion, the conventionally stabilized earth wall can be modified by adjusting the length of reinforcement to conform to the characteristics of the different construction areas. The modification and arrangement of reinforcement components including their tensile strength, vertical spacing, aspect ratio, as well as configuration play key roles in the behavior of reinforced earth walls and can also lead to differences in the distribution of lateral earth pressure as compared with conventional MSE walls. In this study, a series of geotechnical centrifuge tests were conducted to clarify the failure behaviors, distribution of lateral earth pressure, and deformation progresses of narrow geosynthetic reinforced earth (GRE) walls, including single-facing and double-facing narrow GRE wall. The mutual relationship among lateral earth pressure, zero-earth-pressure zone, and horizontal displacement can be applied to predict the deformation of a narrow GRE wall. The deformation - based - design is established in order to predict the progressive behavior of reinforcement component in reality. A design process for narrow GRE wall structure is proposed to simplify the calculation based on thorough understanding from experimental results. This study facilitates geotechnical engineers to calculate conveniently and accurately the narrow GRE wall in practice.
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