EXPERIMENTAL STUDY ON LIQUEFACTION CHARACTERISTICS OF SATURATED SILTY SOIL AT YELLOW RIVER DELTA

This paper studies the influence of effective confining pressure, dynamic load and silt content on liquefaction characteristics of the remolded saturated silty soil at Yellow River delta. It carries out a series of undrained dynamic triaxial tests using the constant clay content and dry density approach. These tests are conducted on specimens of size 50 mm diameter and 100 mm height. The results show that:(1)Under the condition of the silt content not less than 50%, the increase of silt content reduces the liquefaction potential of the remolded saturated silty soil. (2)The dynamic strength of the remolded saturated silty soil increases along with the effective confining pressure increasing, and it shows an approximate linear relationship with the logarithm of the initial liquefaction vibration number. (3)Compared with sandy soil, the dynamic pore pressure of silty soil is difficult to achieve the effective confining pressure. With the increase of effective confining pressure, the ratio of dynamic pore pressure to the effective confining pressure decreases. With the increase of silt content, the influence of silt content on the dynamic pore pressure decreases. The increase of silt content slows down the growth of dynamic pore pressure. (4)According to the experimental results, a dynamic pore pressure calculation model and related parameters of the remolded saturated silty soil is proposed.