摘要
本文结合浦东新区某工程的基坑开挖，研究土体的流变特性及其在基坑支护监控量测中的应用。采用最小二乘法原理将实测位移一时间曲线拟合为多项式，并在此基础上利用位移反分析方法获得三元件粘弹性模型的各项参数，进而得到一个综合线弹性模量Ｅ（ｔ），从而以简单的线弹性有限元程序计算出各时刻的位移值ｕ（ｔ）。计算结果表明三元件模型能较好地反映上海地区软粘土的流变特性。
l Based on excavation work of foundation ditch in Pudong district, Shang-hai, the reological properties of soil body was studied and the results were used for moni-toring measurement of foundation ditch support. Using principles of least square method,the measured displacement - time curve was imitated into polynominal. On this basis andwith reverse analysis of displacement , the parameters of visco - elasticmodel for trielementswere obtained. Then a complex linear modulus of elasticity E(t) was gainedd. The dis-placements at different rnoments u(t) were calculated by a simple program for linear elasticfinite elements. Results show that the trielement model can properly express the reologicalproperties of soft soil in Shanghai area.[
出处
《地下空间》
CSCD
1995年第3期167-175,214,共10页
Underground Space
关键词
基坑
土体
流变
监视控制
支护
三元件模型
Foundation ditch excavation , reology, monitoring measurement. triele-ment model, reverse analysis.
