摘要
在ZSY-1型真三轴仪上控制2ε≈0进行基坑土体的k0固结-侧向卸荷的平面应变试验研究,得出土体侧向卸荷时侧向应力与其应变之间关系。根据其应力应变曲线性状,运用Duncan-Chang模型的建模思路来描述平面应变条件下土体侧向卸荷的侧向应力应变之间关系,并由此得出卸荷土体的初始切线弹性模量及其变化规律,推导出反映坑侧土体侧向卸荷实际应力路径下土样的非线性切线模量表达式。
The k0 consolidation-lateral unloading plane strain experiment is made with the ZSY-1 true triaxial apparatus as ε≈0 using the soil from the foundation pit. The curves of lateral stress-strain under lateral unloading are gotten. The lateral stress-strain relation of the soil under lateral unloading is described according to the ideas of the Duncan-Chang model, and the initial tangent unloading modulus and its change rule of the soil are obtained. Also deduced is the nonlinear tangent modulus formula of the soil with the actual stress path under lateral unloading in the foundation pit.
出处
《合肥工业大学学报（自然科学版）》
CAS
CSCD
北大核心
2009年第10期1551-1553,1570,共4页
Journal of Hefei University of Technology：Natural Science
基金
国家自然科学基金资助项目(50608038)
关键词
基坑开挖
平面应变试验
真三轴仪
侧向卸荷
卸荷模量
foundation pit excavation
plane strain experiment
true triaxial apparatus
lateral unloading
unloading modulus
