| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for making liquefaction upon an earthquake unlikely by changing a property of natural ground by mixing cement milk and the natural ground for the ground with a high possibility of liquefaction upon an earthquake. <P>SOLUTION: On sand ground where an upper structure without an upper load or with a light upper load is constructed, an agitating and mixing device for agitating and mixing the sand ground with cement milk, filling the cement milk in the on-site sand ground and forming circular columns in the ground is used, and the plurality of circular columns for turning an N value of the ground to at least 15 or more on average are formed. At the time, when a diameter of the circular column is defined as D and a pitch p between circular column centers on plane as p, in a range satisfying p≤2D, the plurality of circular columns are formed at the pitch of a fixed interval in a matrix. <P>COPYRIGHT: (C)2013,JPO&INPIT |
