雙階式加勁擋土牆的內部穩定及主動土壓力分佈研究

In recent times, a vast number of construction projects that are relevant to geotechnical engineering have been designed and are executed annually. Generally, "retaining structures", in terms of wall structure and stiffness, they can be divided into several types: monolithic retaining walls (gravity retaining walls or masonry), precast retaining walls, gabion walls or reinforced earth wall. Reinforced earth structures are mainly established to protect significant existing structures such as highways, coastlines, military installations and so on. The design methods for the construction of reinforced earth walls are quite diverse depending on different wall inclinations, from one tier to multi-tier. In this context, the design of two-tiered reinforced earth walls or superimposed geosynthetic reinforced earth walls (SGREW) is widely preferred because of their simple configuration and load-bearing capacity. In previous studies, the internal stability of SGREW has been designed based on the maximum tensile force lines which were derived geometrically and empirically. Based on the experimental results, the modified lateral earth pressure method and the reinforced earth structure stability method can be applied to design the SGREW in terms of breaking failure behavior. This study aims to clarify the actual workings, failure behaviors and internal stability design of SGREW, simultaneously offering recommendations for ease of future designs with ease.