岩土力学2012，Vol.33Issue(3)：783-787,5.
侧限压缩条件下土体的侧应力松弛试验研究
Lateral stress relaxation of soil under confined compression condition
摘要
Abstract
Lateral stress relaxation is one of the important rheological characteristics of soil under confined compression condition. Confined rheological tests are carried out on the revamped consolidation apparatus. The results show that the lateral stress relaxation curves and the vertical creep curves of soil appear synchronous process which consists of unsteady, steady and sudden change stages under confined compression with constant load. Then the mechanism of lateral stress relaxation is analyzed based on the test curves by using the theory of structural grain directional array and the strength theory of soil. Some conclusions can be achieved through mechanism analysis that the three stages relaxation characteristics of lateral stress are induced by the interaction between compaction recovery and shear fracture of soil structure; and the limit state of lateral stress in stable relaxation stage is controlled by the shear strength of soil. In addition, the relaxation extent of lateral stress in higher stress level is more remarkable than in lower stress level. These conclusions will be favorable for further study of the relation between long-term bearing capacity and settlement of ground.关键词
侧限压缩/侧应力松弛/土体结构/强度理论/应力水平Key words
confined compression/ lateral stress relaxation/ soil structure/ strength theory/ stress level分类
建筑与水利引用本文复制引用
田管凤,汤连生..侧限压缩条件下土体的侧应力松弛试验研究[J].岩土力学,2012,33(3):783-787,5.基金项目
国家自然科学基金资助项目(No.40872205) （No.40872205）
全国高等学校博士学科专项科研基金资助项目(No.20070558032) （No.20070558032）
广东省自然科学基金资助项目(No.07003738) （No.07003738）
广东省科技计划资助项目(No.2008B030303009). （No.2008B030303009）
