Model excavation tests simulating the collapse of high bending rigidity cantilever-type earth retaining walls and proposal of a simple calculating method for the reasonable embedding length

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  • 壁体剛性の高い自立式土留め工の崩壊を模擬した模型掘削実験と合理的な根入れ長の簡易算定法の提案

Abstract

<p>In conditions with severe displacement limitations such as neighboring work, the high bending rigidity cantilever-type earth retaining walls are expected to be applied due to their superior workability. This study focuses on design issues related to the embedding length of high bending rigidity cantilever-type earth retaining walls, especially the limitation of βL, which is an assumed condition for semi-infinite length when applying Chang's equation. The excavation experiment using an aluminum rod model ground to simulate the collapse and its replicated analysis confirmed that limiting the βL is on the excessively safe side, and a simple overturning analysis alone cannot eliminate the risk of completely ignoring the conventional βL limit. As an alternative, a simplified method is proposed to calculate the final embedding length by multiplying the design embedding length obtained from the overturning analysis by a safety factor depending on the value of βL. By applying the proposed method. A reasonable Embedding Length can be calculated while ensuring the safety of cantilever-type earth retaining walls.</p>

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