| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 107 === This study is based on the analysis of different sizes of gravity retaining walls. The design is based on relevant specifications to establish a reasonable structure and stability review. This study is an analysis of the overturning safety factor and the anti-sliding safety factor. It also analyzes the mechanics of gravity retaining wall with PLAXIS 2D program.
We can find the results listing below using the PLAXIS 2D program to analyze the variation of the top and bottom width of the retaining wall, and also to change the vertical position of the retaining wall (vertical wall toe or vertical back of the wall):
1.When the top width and bottom width of the gravity retaining wall become larger, benefiting from the increase in self-weight, which makes the engineering safety factor higher and the stability better.
2.The top of the retaining wall itself will increase with the increase of the size of the retaining wall (self-weight increase), and the backing tendency of the retaining wall is obvious.
3.When the retaining wall is designed as a vertical wall toe, the displacement trend of the retaining wall (forward leaning) is opposite to the trend of the vertical wall back (back leaning).When an earthquake or heavy rain occurs, there will be an outward dumping.
4.As the size of the retaining wall increases, the resistance to the active earth pressure is relatively larger, so the passive earth pressure is significantly reduced.
5.When the wall back of the retaining wall is vertical, the maximum amount of passive earth pressure is 41.4~53.5%. Therefore, when using the theoretical formula, it is recommended to calculate the safety factor of retaining wall with 1/2 times passive earth pressure.
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