A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
METHOD AND DEVICE FOR ASSESSING PIPING PHENOMENON
PROBLEM TO BE SOLVED: To assess a piping phenomenon taking place in a sandy soil layer of a foundation ground in a way that suits an actual situation of progress of the piping phenomenon.SOLUTION: An assessment method on a piping phenomenon includes the following steps for: drilling a water injection hole 1 and a water withdrawal hole 2 through a sandy soil layer G contained in a foundation ground; shifting soil particles constituting the sandy soil layer G from the water injection hole 1 side to the water withdrawal hole 2 side, by performing water injection into the water injection hole 1 and water withdrawal from the water withdrawal hole 2 simultaneously; and calculating a change with time of hydraulic gradient between the water injection hole 1 and the water withdrawal hole 2 based on a water level inside the water injection hole 1, a water level inside the water withdrawal hole 2, and a distance between the water injection hole 1 and the water withdrawal hole 2, the hydraulic gradient changing while shifting the soil particles. The piping phenomenon taking place in the sandy soil layer G is assessed based on the change with time of the hydraulic gradient.SELECTED DRAWING: Figure 1
【課題】基礎地盤の砂質土層で発生するパイピング現象を、パイピング現象の進行段階の実態に即して評価できる。【解決手段】パイピング現象評価方法は、基礎地盤に含まれる砂質土層Ｇに注水孔１及び揚水孔２を削孔する工程と、注水孔１に注水する処理及び揚水孔２から孔内水を揚水する処理を並行させ、砂質土層Ｇを構成する土粒子を注水孔１側から揚水孔２側へ移動させる工程と、注水孔１内の水位と、揚水孔２内の水位と、注水孔１と揚水孔２の間隔とから、移動させる工程中に変化する、注水孔１と揚水孔２の間の動水勾配を求め、動水勾配の経時変化を演算する工程と、を含み、動水勾配の経時変化によって、砂質土層Ｇで発生するパイピング現象を評価する。【選択図】図１
METHOD AND DEVICE FOR ASSESSING PIPING PHENOMENON
PROBLEM TO BE SOLVED: To assess a piping phenomenon taking place in a sandy soil layer of a foundation ground in a way that suits an actual situation of progress of the piping phenomenon.SOLUTION: An assessment method on a piping phenomenon includes the following steps for: drilling a water injection hole 1 and a water withdrawal hole 2 through a sandy soil layer G contained in a foundation ground; shifting soil particles constituting the sandy soil layer G from the water injection hole 1 side to the water withdrawal hole 2 side, by performing water injection into the water injection hole 1 and water withdrawal from the water withdrawal hole 2 simultaneously; and calculating a change with time of hydraulic gradient between the water injection hole 1 and the water withdrawal hole 2 based on a water level inside the water injection hole 1, a water level inside the water withdrawal hole 2, and a distance between the water injection hole 1 and the water withdrawal hole 2, the hydraulic gradient changing while shifting the soil particles. The piping phenomenon taking place in the sandy soil layer G is assessed based on the change with time of the hydraulic gradient.SELECTED DRAWING: Figure 1
【課題】基礎地盤の砂質土層で発生するパイピング現象を、パイピング現象の進行段階の実態に即して評価できる。【解決手段】パイピング現象評価方法は、基礎地盤に含まれる砂質土層Ｇに注水孔１及び揚水孔２を削孔する工程と、注水孔１に注水する処理及び揚水孔２から孔内水を揚水する処理を並行させ、砂質土層Ｇを構成する土粒子を注水孔１側から揚水孔２側へ移動させる工程と、注水孔１内の水位と、揚水孔２内の水位と、注水孔１と揚水孔２の間隔とから、移動させる工程中に変化する、注水孔１と揚水孔２の間の動水勾配を求め、動水勾配の経時変化を演算する工程と、を含み、動水勾配の経時変化によって、砂質土層Ｇで発生するパイピング現象を評価する。【選択図】図１
METHOD AND DEVICE FOR ASSESSING PIPING PHENOMENON
パイピング現象評価方法及びパイピング現象評価装置
AGUI KATSUHITO (author) / SHINAGAWA SHUNSUKE (author) / YOSHIDA NAOTO (author) / NAKAGAWA KIYOMORI (author)
2016-12-22
Patent
Electronic Resource
Japanese
IPC:
E02D
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