AN IMPROVED METHOD FOR ESTIMATING IN-SITU UNDRAINED SHEAR STRENGTH OF NATURAL DEPOSITS
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概要
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An equation for estimating in-situ undrained shear strength (q_<u(I)>) of natural deposits is derived as q_<u(I)>/2c<u(I)>=1.0-0.285 ln p_m/S_0 through the unconfined compression test (UCT) and K_0 consolidated-undrained triaxial compression test (CK_0UC). The q_<u(I)> of natural clay deposits can be estimated from the q_u value multiplied by the reciprocal number of q_<u(I)>/2c_<u(I)> of the equation using the suction (S_0) and q_u obtained from UCT for a specimen, where c_<u(I)> is in-situ shear strength measured from CK_0UC and p_m is two times the effective overburden pressure divided by three. The q_<u(I)>/2c_<u(I)> values were unrelated to I_p, q_u and p_m/S_0 and the mean value of these ratios was 0.98 in the range of I_p=26〜110 and q_u=12〜178 kPa. The mean values of the ratios for q_u, q^*_<u(I)> and q_<u(I)> to 2c_<u(I)> were 0.629, 0.998 and 0.977 and the standard deviation of those ratios were 0.14, 0.10 and 0.16, respectively. Therefore, it can be seen that the improved method is appropriate as well as Shogaki's basic method (q^*_<u(I)>). The mean values of q_<u(I)>/2c_<u(I)> were 0.94, 0.99 and 0.91 for Iwai organic and soft clay plus Kahokugata clay, respectively. The coefficient of variations of the q_u and q_<u(I)> values were (13〜14)% and unrelated to soils, q_u or q_<u(I)> values. Therefore, the applicability of the improved method newly developed in this study can be confirmed for Kahokugata and Iwai clays as well as Iwai organic soils. The proposed method is a simple and easy one for practical engineering usage.
- 社団法人地盤工学会の論文
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