| 摘要 |
PURPOSE:To prevent a structure from being influenced by earth pressure, by forming excavated slots or grooves filled up with stabilizing liquid, on the periphery of the structure, when a work expanding a ground volume like pile driving, deep-seated mixture processing construction, or the like near the pre-set structure is executed. CONSTITUTION:Before a new structure 14 is constructed right over a pre- constructed underground tunnel 12 in poor subsoil 10, then underground-tunnel- protecting columnar wall units 16 are constructed on both the sides of the tunnel 12 at specified intervals. In front of the constructed units 16, excavated slots 20 are formed at a proper internal on the periphery of the tunnel 12 and are filled up with stabilizing liquid 18 made of bentonite liquid mud. After that, the excavated slots 20 are formed with circular cross sections or in groove shapes with small widths, and are arranged roughly on center lines between the external sides of the tunnel 12 and the internal sides of the wall units 16 organized with deep-seated mixture, and to a depth closer to the organized depth of the deep-seated mixture than to the depth of the deepest section of the tunnel 12. As a result, the ground expanding phenomenon of the tunnel 12 can be suppressed.
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