| Summary: | 碩士 === 逢甲大學 === 土木工程學系 === 103 === In this thesis, two kinds of specifications including design procedures, basic requirements, and safety factors for design of reinforced soil wall including FHWA of U.S.A. and DIBT of German were studied. Calculation sheets using EXCEL were developed. Further study by using DIBT specification was also included. The design needs to meet the requirements of both external stability and internal stability for each specification. Same design parameters were used for analysis including: height of wall (H), total length of reinforcement (L), bottom length of reinforcement (B), friction angle of reinforced fill (∅_wall), friction angle of retained fill (∅_backfill), friction angle of foundation (∅_foundation), unit weight of the reinforced backfill (γ_wall), unit weight of the retained backfill (γ_backfill), unit weight of soil (γ_foundation).
According to the study of German DIBT specifications, the external stability needs to consider two kinds of the bearing pressure on foundation soils. One is the condition of maximum load, and another is the condition of maximum overturning load. The results of study indicate safety factor of foundation bearing capacity (FS_b) obtained under the maximum overturning load is less than that of maximum load. The results also show that as long as the safety factor under maximum overturning load no less than 2.0 which is the value required by the specification, the requirement of safety factor for stability against sliding FS_s>1.5 and under the maximum load condition FS_b>2 will be satisfied. Rresults also indicate safety factors of internal stability will meet requirement when the safety factors of external stability are no less than those of required by specification.
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