Title:
MEASURING METHOD FOR DEGREE OF SATURATION OF GROUND AND LIQUEFACTION PREVENTING METHOD
Document Type and Number:
Japanese Patent JP3800525
Kind Code:
B2
Abstract:
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.
Inventors:
Kiji Miyake
Nobuaki Kosaka
Akira Ishikawa
Nobuaki Kosaka
Akira Ishikawa
Application Number:
JP2002086864A
Publication Date:
July 26, 2006
Filing Date:
March 26, 2002
Export Citation:
Assignee:
Shimizu Construction Co., Ltd.
International Classes:
E02D1/00; E02D3/10; G01N33/24; (IPC1-7): E02D1/00; E02D3/10; G01N33/24
Other References:
地盤工学への物理探査技術の適用と事例編集委員会,地盤工学への物理探査技術の適用と事例,日本,社団法人地盤工学会,2001年10月31日,第9~11頁
地盤工学ハンドブック編集委員会,地盤工学ハンドブック,日本,社団法人地盤工学会,1999年 3月20日,第1刷,第1314~1318頁
地盤工学ハンドブック編集委員会,地盤工学ハンドブック,日本,社団法人地盤工学会,1999年 3月20日,第1刷,第1314~1318頁
Attorney, Agent or Firm:
Masatake Shiga
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama