| 摘要 |
PROBLEM TO BE SOLVED: To simply measure the degree of saturation of ground to thereby rationally perform ground water pumping for preventing liquefaction. SOLUTION: According to this method for measuring the degree of saturation as an index of strength to the liquefaction of ground, P-wave propagation speed in each depth of ground is measured, and the degree of saturation is found from the measured value. A probe 6 for measuring P-wave propagation speed is inserted in a measuring hole 5 provided in the ground to measure the P-wave propagation speed in each depth. A bellows-like well pipe formed by flexible material where shape retaining rings are mounted at spaces is provided in the measuring hole. The degree of saturation of ground is measured by the above method, and according to the measurement result, pumping is performed from the ground to lower the level of ground water, whereby the degree of saturation of ground is lowered so as to heighten the strength to liquefaction. COPYRIGHT: (C)2004,JPO
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