摘要
为探讨苏州地铁一号线沿线软土地层的蠕变特性及其对盾构隧道长期沉降的影响,对该区土样进行三轴试验和一维蠕变试验。引入关口-太田模型(S-O模型)描述苏州土依赖时间的本构关系,结合有限元程序GLEAVES对试验进行数值模拟,并验证模型及程序的可靠性。最后对苏州地铁长期沉降作一算例分析。研究表明:苏州地铁沿线土层有明显的蠕变效应;引入S-O模型的GLEAVES程序较好地模拟出苏州土本构关系;为控制隧道的长期沉降,应严格控制盾构顶推力。
The triaxial compression test and one dimensional creep test are employed for the soft soil along the No. 1 Subway in Suzhou City to study its creep characteristics and their effect on the long - term settlement of shield tunnel. Sekiguchi - Ohta constitutive model （ S - O model ） is introduced to describe the time - dependent stress - strain behavior of the soil. The model is incorporated in the FEM program GLEAVES to simulate the above tests. The validity of the model and GLEAVES are checked. Then GLEAVES is used to analyze the post - construction long - term settlement of shield tunneling. The research shows that the soft soil along the Subway is obvious with creep effect. GLEAYES which adopts S - O model can simulate the stress - strain behavior of the soil well. The jacking thrust of shield machine should be controlled in appropriated range according to the results.
出处
《地下空间与工程学报》
CSCD
北大核心
2010年第1期80-83,共4页
Chinese Journal of Underground Space and Engineering
关键词
软土
蠕变
本构模型
有限元分析
盾构隧道
soft soil
creep
constitutive model
finite element analysis
shield tunnel
