Laboratory experiments identify optimal mix-proportion and bentonite influences on strength for engineering applications.
The jumbo-jet special grouting method, introduced from Japan to Taiwan, is often used for the geological improvement of the start and terminus shafts of shield tunnels and the outside of cross passages. The geological conditions of Japan and Taiwan are different, and the mix-proportion of the construction method adopted in Taiwan is based on Japanese specifications, which leads to difficulties in the excavation of shield machines due to the high strength. Through a series of laboratory experiments under simulated site conditions, this study explores the appropriate mix-proportion and the influences of bentonites on strength so as to provide assistance to engineering.
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Wu-Te Ko (2022) studied this question.
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