饱和砂土的非稳定性

饱和砂土的非稳定性 English Version

摘要: 砂土的非相关塑性流动可能导致介质本身的失稳和问题解的非唯一性。然而，无论是Ｄｒｕｃｋｅｒ或Ｈｉｌｌ的假设，都只能给出介质稳定的充分条件。本文首先分析饱和砂土的非相关流动特性，利用局部屈服面和局部塑性势面的概念，分析得出饱和砂土稳定的充分必要条件；然后给出不稳定区域在应力空间的具体位置。文中提出的“不稳定线”与“崩塌面”相一致，表明了它在海底稳定性分析中有着广泛的实践意义。
- 非相关流动 /
- 非稳定性 /
- 局部屈服面和塑性势面 /
- 崩塌面
Abstract: Non-associated flow may lead to the instability of sand and non-unique solution of the prob-lem,but neither Drucker’s nor Hill’s postulate gives necessary but sufficient conditions for stability ofgranular materials.Based on the concepts of local yield and plastic potential surface,non-associative be-haviour of saturated sands is analyzed,and a sufficient and necessary condition for the stability is prop-osed.The potential instability line is established on the p’-q plane, which is on the “collapse surface”￣[8]
- nonassociated flow /
- instability /
- local yield and plastic potential surface /
- collapse surface.