| Autor: |
Wang, Hailong, Ito, Daichi, Shirakawabe, Takumi, Ruan, Kunlin, Komine, Hideo |
| Předmět: |
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| Zdroj: |
Géotechnique; Jan2024, Vol. 74 Issue 1, p64-80, 17p |
| Abstrakt: |
This study starts from a question: how would initial water content (wi) affect equilibrium swelling pressure (peq) of compacted bentonites in swelling pressure tests (ps tests)? However, discussions based on experiments involving a bentonite, Kunigel V1 (K_V1), are extended to the following issues: (a) the effect of wi on peq; (b) pore water density (ρpw); (c) the co-existence of crystalline and osmotic swelling; and (d) relation between peq and compaction tests (pc tests). It is revealed that wi has an insignificant effect on peq in general, although a significant effect may appear for relatively high wi and dry density (ρd) conditions. Two swelling types, crystalline swelling with basal spacing of montmorillonite (d001 = 1·0–1·9 nm) and osmotic swelling (d001 ≥ ∼4·0 nm), co-exist in a w range from 36 to 65%. With the fact that ρpw of K_V1 may range from 1·1 to 1·2 Mg/m3, it is expected that crystalline swelling may mainly govern peq in ps tests if the final dry density of a specimen (ρdf) is larger than 1·46 Mg/m3, while osmotic swelling may mainly govern if ρdf < 1·05 Mg/m3. Together with the results of pc tests, the effects of wi on peq are explained by the proposed conceptual model. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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