Diaphragm water wall construction

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PROBLEM TO BE SOLVED : To provide an underground continuous cut-off wall method in which an underground continuous cut-off wall is established by a wall composition using a smectite clay mineral granular materials as a main component, regarding the impervious performance of the underground continuous cut-off wall, and in which the underground continuous cut-off wall has self-repair performance for a crack due to water absorption and expansivity of the smectite clay mineral granular material when the wall is cracked.SOLUTION : The underground continuous cut-off wall method comprises a step of digging and mixing by using bubble-mixed earth obtained by adding bubble or bubble and water, as a stabilizer, and a replacement step of sending a wall composition to the bottom of the dug part so as to replace the bubble-mixed earth with the wall composition after completion of the digging and mixing step. In the method, the wet density of the bubble-mixed earth at the time of digging and mixing is adjusted to be in a range from 1.03-1.72 g/cm, and the wall composition to be used in the replacement step is obtained by mixing a smectite clay mineral granular material with water or with water and bubble.