Post-Liquefaction Volumetric Strain

Effect of Silt Content Figure 12a shows the post-liquefaction volumetric strain data for all of the soils tested in this study. There is no single relationship for volumetric compression against void ratio for all soils. Figures 12b-c show the data after splitting the data for Ottawa sand-silt mixes into two parts, one for sands and silty sands up to 25% silt content, and the other for sandy silts with silt content above 25%, and plotted against the equivalent intergranular and interfine void ratios (e ) and (Cj), respectively. Each data set falls in a narrow band. 

Figure 11. Post-Liquefaction volumetric strain and cyclic strain level (Clean Sands)...

Figure 13b shows the volumetric strain data against for sand and silty sand at silt content up to 25%. The data in Figure 13b falls in a narrow band, similar to the Figure 12b. These results combined with Figure 11c indicate that post-liquefaction volumetric strain in silty sands follows the same trend as shown in Figure 11c for clean sands, when combined together using equivalent relative density The data for...

The post-liquefaction volumetric strain data for clean sand from this study falls in the range of data for clean sands available in the literature. Silt content also affects the post-liquefaction volumetric strain response. However, at the same equivalent intergranular void ratio (6, ), a clean sand and granular mix containing the same host sand and non-plastic silt have similar post-liquefaction volumetric strain response. At the same equivalent interfme void ratio a sandy silthas similar post-liquefaction volumetric strain response as the host silt. Equivalent relative density may be a useful parameter to eollectively characterize the post-liquefaction compressibility and volumetric strain response of silty sands with clean sands. 

Determination of post-liquefaction ground settlement and volumetric strain is an important aspect in performance evaluation of liquefiable soil sites. At present, there is only limited data available on this subject (Ishihara Yoshimine, 1992 Lee Albaisa, 1974 Pyke et al., 1975 Silver Seed, 1971a,b Tatsuokaetal., 1984 Tokimatsu Seed 1984, 1987 Yoshimi et al., 1975). The data are primarily limited to clean sands. The data from the current study sheds further light on this subject. 

Clean Sand The available post-liquefaction reconsolidation volumetric strain vs. relative density data for clean sands in the literature is summarized in Figures lla-b (Ishihara Yoshimine, 1992,... 

---