Effects of soil hydraulic hysteresis on slope reliability
The hysteretic nature of soil hydraulic functions has been known for a long time. It can affect the soil atmosphere fluxes and consequently influence the hydraulic process in soil slopes and slope stability. Usually the soil hydraulic functions are assumed to be nonhysteretic in routine engineering practice and soil hydraulic functions measured in drying conditions are used. In this paper, the effects of hydraulic hysteresis on slope reliability during cycles of evaporation and precipitation are studied. Three cases of reliability analyses with different assumptions about the hysteresis of soil hydraulic properties are conducted for an unsaturated soil slope with completely decomposed volcanic soils. It is found that the variation of the mean and the COV of the safety factor with time are most significant in Case 1 where the drying hydraulic functions are used in both drying and wetting cycles. Without considering soil hydraulic hysteresis, the reliability of the slope is underestimated.
L.L.Zhang
Shanghai Jiaotong University, Shanghai, China
国际会议
上海
英文
2007-10-18（万方平台首次上网日期，不代表论文的发表时间）