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A Study of Liquefaction Countermeasures for Manholes Under the Pavement

by Koji Yagi, NTT, Tsukuba, Japan,
Shinji Mataki, NTT, Tsukuba, Japan,
Shiro Takada, NTT, Tsukuba, Japan,
Sun Jian Sheng, NTT, Tsukuba, Japan,



Document Type: Proceeding Paper

Part of: Lifeline Earthquake Engineering

Abstract:

The gravel drain method has proven to be an effective countermeasure for underground structures in liquefying ground. However, due to the road pavement, there is no draining passage through which excess pore water can pass to the surface. Therefore, it has not been determined whether this method is effective in cases where manholes are buried under the pavement. In this study, we employed a two-dimensional dynamic finite element method, to analyze the distribution of the excess pore water pressure ratio in the ground surrounding a manhole. In this case, the gravel drain method with drain pipes was applied to a manhole. The excess pore water was drained into the manhole through the drain pipes. In this way, both the quantity and rate of drainage into the manhole could be calculated, and the risk of manhole rising was analyzed.

Subject Headings: Drainage | Soil liquefaction | Maintenance hole | Water pressure | Finite element method | Pavements | Soil water

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