LIQUEFACTION COUNTERMEASURE CONSTRUCTION METHOD AND LIQUEFACTION COUNTERMEASURE STRUCTURE OF LINEAR BANKING STRUCTURE

To provide a liquefaction countermeasure construction method and a liquefaction countermeasure structure of linear banking structure which can prevent floating of an underground structure and an obstacle on the ground due to liquefaction simply and at low cost by effectively utilizing a linear banking structure to be constructed, and which have excellent workability and economical efficiency.SOLUTION: In constructing a linear banking structure 1 of a banking dike 1 and the like, a liquefaction countermeasure construction method targets a crossing portion X where an underground structure 10 is installed so as to cross when the linear banking structure to be constructed is viewed in a plan view. Grounds G on both sides excluding the crossing portion X are improved by liquefaction countermeasure means, and a slab 2 is constructed which has the size that bites into the linear banking structure 1 to be constructed on the grounds G on both sides from the crossing portion X, and the slab 2 and the underground structure 10 can transmit stress by being joined integrally or via a backfilling member 8, and the ground of the crossing portion X is not improved. After that, the linear banking structure 1 is constructed on an upper surface of the slab 2.SELECTED DRAWING: Figure 3 【課題】構築する線状盛土構造物を有効利用することにより、地中構造物や地上支障物の液状化による浮き上がりを簡易かつ安価な構造で防止することができる、施工性および経済性に優れた線状盛土構造物の液状化対策工法および液状化対策構造を提供する。【解決手段】盛土堤防１等の線状盛土構造物１を構築するに際し、構築する前記線状盛土構造物を平面的に見て交差するように地中構造物１０が設置されている交差部分Ｘを対象とした液状化対策工法であって、前記交差部分Ｘを除いた両側の地盤Ｇを液状化対策手段で改良すると共に、前記交差部分Ｘから前記両側の地盤Ｇ上に構築する前記線状盛土構造物１へ食い込む大きさのスラブ２を構築し、前記スラブ２と前記地中構造物１０とは、一体的に接合して又は埋め戻し部材８を介して応力伝達可能な構成とし、前記交差部分Ｘの地盤は改良しない。しかる後、前記スラブ２の上面に前記線状盛土構造物１を構築する。【選択図】図３