REINFORCED AND BACK-FILLED GROUND, AND METHOD OF DEVELOPING THE SAME

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PROBLEM TO BE SOLVED : To improve the ground strength of back-filled ground when an earth retained space which is partitioned and formed by removing an underground portion of an existing building, is back-filled with general backfill earth. SOLUTION : Reinforced and back-filled ground is created by forming ground reinforcing structures 10 in the back-filled ground 1 which is developed by filling a backfill material in the backfill space partitioned by an earth retaining wall 2, to thereby ensure the sufficient ground strength. The ground reinforcing structure 10 is formed of an improved earth material containing a coarse grain material, a hydraulic hardener, and water which are mixed together and hardened. Then the improved earth material is laid between general back-filled earth layers 4 which are back-filled in the back-filled space, near a depth corresponding to a cut beam location arranged in an initial back-filled space so as to have a predetermined layer thickness. Thus deformation of the earth retaining wall 2 toward the back-filled ground is prevented. COPYRIGHT : (C)2007, JPO&INPIT