Application of the dilatometer test for estimating undrained shear strength of Busan New Port clay

作者：Choo Hyunwook; Lee Woojin; Hong Sung Jin; Lee Changho^*

来源：Ocean Engineering, 2016, 115: 39-47.

DOI：10.1016/j.oceaneng.2015.11.017

• Dilatometer test (DMT)
• Field vane test (FVT)
• K-0 consolidated-undrained triaxial compression test
• Mobilized undrained shear strength

The dilatometer test (DMT) is an economical and fast tool that evaluates the stratigraphy and properties of soil. In this study, a series of DMTs, field vane tests (FVTs), and K-0 consolidated-undrained triaxial compression (CK0UC) tests were performed to develop an empirical correlation for the undrained shear strength (s(u)) of clayey soils from the Busan New Port site. The stress-normalized mobilized s(u)(mu s(u)/sigma(v)') for both laboratory tests and FVTs is determined to be around 0.22, which is consistent with previous studies. The exponent m for overconsolidation ratio (OCR), which is in the relation of s(u)/sigma(v)'=S center dot OCRm, is determined to be 0.83 by using the SHANSEP technique. Two different methods of estimating s(u) are reviewed to make use of either the horizontal stress index (K-D) or the bearing factor (N-c). Because the DMT results indicate that the N-c is linearly proportional to the material index (I-D), representing the characteristics of soil, the empirical s(u) estimating formula with I-D is newly suggested in this study. According to the values for the mean absolute percentage error (MAPE), the empirical correlation with I-D shows a slightly better accuracy than that using K-D. However, a comparison between the values for the s(u) that are measured and estimated by using two different methods shows good agreement in general.

• 出版日期2016-3-15