地基的临塑、界限和极限荷载的探讨

Researches on Critical Edge Load,Critical Load and Ultimate Load of Soil Mass

基于Lade-Duncan破坏准则,在平面应变条件下,本文首先解决了土体内聚力和内摩擦角的合理选取问题,进而利用这些参数进一步探讨了地基的临塑荷载、界限荷载和极限荷载。研究结果表明,土体的天然静止侧压力系数对地基的临塑荷载和界限荷载有显著的影响;同时也指出中间主应力对地基的临塑荷载、界限荷载或极限荷载均有重要的影响,显著地提高了地基的承载力。

Based on Lade-Duncan failure criterion, calculating methods of cohesion and internal frictional angle of soil mass under plane strain state are given firstly, and critical edge load, critical load and ultimate load of shallow foundations are further studied in detail by using the cohesion and internal frictional angle. Researching results show that the natural lateral soil pressure coe^icient at rest state has an important influence on values of the critical edge load and critical load, and that the internal principal stress also has a notable impact on values of the three kind loads in the end.