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A platform for research: civil engineering, architecture and urbanism
GROUND LIQUEFACTION PREVENTION METHOD
PROBLEM TO BE SOLVED: To provide a ground liquefaction prevention method which enables a highly reliable liquefaction prevention measure to be taken by estimating a saturation degree of the ground with higher accuracy than a conventional method.SOLUTION: A ground liquefaction prevention method comprises: a groundwater level lowering process to lower a groundwater level by pumping groundwater through a well 2; and a groundwater level restoration process to put the ground G into an unsaturated state by restoring the groundwater level in a manner that allows the groundwater W to flow into the ground G from a cut-off wall outside portion 1 or injects the pumped groundwater W back into the same. The groundwater level restoration process has: a sampling step to sample in-situ soil at an object depth; an initial saturation degree measurement step to measure an initial saturation degree of a test piece taken out from a sample obtained through the sampling step; and a saturation degree depth distribution estimation process to estimate depth distribution of the saturation degree after restoration of the groundwater level using a relation between the flow volume of groundwater and the saturation degree. The saturation degree after the restoration of the groundwater level is designed on the basis of a result of the depth direction of saturation degree estimation process.SELECTED DRAWING: Figure 1
【課題】従来と比較し地盤の飽和度を正確に捉え、信頼性の高い液状化対策を可能にする地盤の液状化防止方法を提供する。【解決手段】井戸２から揚水して地下水位を低下させる地下水位低下工程と、止水壁外部１からの地下水Ｗの回り込みもしくは揚水した地下水Ｗの注水により地下水位を回復させて不飽和状態の地盤Ｇを作り出す地下水位回復工程とを備える地盤の液状化対策方法において、地下水位回復工程は、対象となる深度の原位置土の試料をサンプリングするサンプリング工程と、サンプリング工程で得た試料から得た供試体の初期飽和度を測定する初期飽和度測定工程と、地下水通水量と飽和度の関係から、水位回復後の飽和度の深度分布を推定する飽和度深度分布推定工程とを備え、飽和度深度分布推定工程の結果に基づいて水位回復後の飽和度を設計する。【選択図】図１
GROUND LIQUEFACTION PREVENTION METHOD
PROBLEM TO BE SOLVED: To provide a ground liquefaction prevention method which enables a highly reliable liquefaction prevention measure to be taken by estimating a saturation degree of the ground with higher accuracy than a conventional method.SOLUTION: A ground liquefaction prevention method comprises: a groundwater level lowering process to lower a groundwater level by pumping groundwater through a well 2; and a groundwater level restoration process to put the ground G into an unsaturated state by restoring the groundwater level in a manner that allows the groundwater W to flow into the ground G from a cut-off wall outside portion 1 or injects the pumped groundwater W back into the same. The groundwater level restoration process has: a sampling step to sample in-situ soil at an object depth; an initial saturation degree measurement step to measure an initial saturation degree of a test piece taken out from a sample obtained through the sampling step; and a saturation degree depth distribution estimation process to estimate depth distribution of the saturation degree after restoration of the groundwater level using a relation between the flow volume of groundwater and the saturation degree. The saturation degree after the restoration of the groundwater level is designed on the basis of a result of the depth direction of saturation degree estimation process.SELECTED DRAWING: Figure 1
【課題】従来と比較し地盤の飽和度を正確に捉え、信頼性の高い液状化対策を可能にする地盤の液状化防止方法を提供する。【解決手段】井戸２から揚水して地下水位を低下させる地下水位低下工程と、止水壁外部１からの地下水Ｗの回り込みもしくは揚水した地下水Ｗの注水により地下水位を回復させて不飽和状態の地盤Ｇを作り出す地下水位回復工程とを備える地盤の液状化対策方法において、地下水位回復工程は、対象となる深度の原位置土の試料をサンプリングするサンプリング工程と、サンプリング工程で得た試料から得た供試体の初期飽和度を測定する初期飽和度測定工程と、地下水通水量と飽和度の関係から、水位回復後の飽和度の深度分布を推定する飽和度深度分布推定工程とを備え、飽和度深度分布推定工程の結果に基づいて水位回復後の飽和度を設計する。【選択図】図１
GROUND LIQUEFACTION PREVENTION METHOD
地盤の液状化防止方法
ISHIKAWA AKIRA (author) / SHAMOTO YASUHIRO (author)
2017-01-19
Patent
Electronic Resource
Japanese
IPC:
E02D
FOUNDATIONS
,
Gründungen
LIQUEFACTION PREVENTION UNDERGROUND OBJECT AND SEISMIC GROUND DEFORMATION PREVENTION STRUCTURE
| European Patent Office | 2017