摘要
根据有效应力原理,从土体应力路径的角度研究了堆载预压与真空预压加固软土地基的机理。通过研究可以发现:堆载预压时土体应力状态介于K0与Kf线之间而真空预压时土体的应力状态介于p轴与K0线之间。应力路径的差别表明:为防止堆载预压引起土体破坏,必须控制加载大小和速率,而真空预压加固时不会引起土体破坏。堆载预压时土体变形表现为垂直向收缩而水平向伸长的剪切变形,真空预压时土体变形主要是收缩变形并且垂直向收缩量大于水平向收缩量。在有效大主应力相同的条件下,真空预压比堆载预压的加固效果好。
According to the principle of effective stress, the mechanism of soft clay consolidation by preloading and vacuum preloading based on stress path analysis is studied. It is found that the stress state from Ko line to K1 line under heaped preloading and changes from p axes to K0 line under vacuum prel heaped changes oading. Base on the stress paths＇ analysis, the following results can be drawn ： the strength and velocity of loading must be controlled to prevent the damage of the soft clay in heaped preloading. But the soft clay is stable when loading in vacuum preloading. The deformation exhibits vertical compression and horizontal tension in heaped preloading. The deformation exhibits compression in two directions and the deformation is larger in vertical direction than in horizontal direction in vacuum preloading. Under the condition with the same effective major principal stress, strengthening effect in vacuum preloading is better than in heaped oreloading.
出处
《工程勘察》
CSCD
北大核心
2009年第9期9-12,共4页
Geotechnical Investigation & Surveying
关键词
真空预压
堆载预压
应力路径
vacuum preloading
heaped preloading
stress path
