关键词: 饱和黏土, 孔压传递, 滞后时长, 孔隙水压缩系数, 渗透系数

Abstract: The transmission of pore water pressure in saturated clay is the foundation for analyzing geotechnical engineering problems. Delays in the transmission process and factors influencing the delay have attracted wide attentions. A testing apparatus was designed to examine the transfer of pore pressure by applying hydraulic pressure to consolidated saturated clay. Subsequently, a numerical model was established to simulate the transfer process of pore water pressure. The results reveal noticeable hysteresis in the transmission of pore pressure in saturated clay, with the duration of hysteresis increasing in proportion to the consolidation pressure. Pore water compression coefficient and soil permeability coefficient are primary factors affecting the hysteresis of pore water pressure transfer. Additionally, further numerical simulations demonstrate that an increase in pore water compression coefficient or a decrease in soil permeability leads to an extended lag time in pore pressure transfer. Specifically, when the pore water compression coefficient exceeds 10^-5 kPa^-1 and the soil permeability coefficient is lower than 10^-8 m/s, the lag time variations become more pronounced.

Key words: saturated clay, pore pressure transfer, hysteresis time, pore water compression coefficient, permeability coefficient