【摘 要】
：
使用MTS-815液压伺服系统对隧道衬砌的混凝土试件进行了三轴压缩蠕变试验,当压缩蠕变强度达到混凝土试件抗压强度的85%时进入加速蠕变阶段。分析了隧道衬砌混凝土三轴压缩蠕
【机 构】
：
重庆大学土木工程学院,重庆大学山地城镇建设与新技术教育部重点实验室,
论文部分内容阅读
使用MTS-815液压伺服系统对隧道衬砌的混凝土试件进行了三轴压缩蠕变试验,当压缩蠕变强度达到混凝土试件抗压强度的85%时进入加速蠕变阶段。分析了隧道衬砌混凝土三轴压缩蠕变变形的特点,确定采用摩尔-库仑准则和Burgers模型串联组合而成的黏弹塑性模型可以合理地描述衬砌混凝土的蠕变特性。组合模型的黏弹性状态与Burgers模型一致,塑性状态与Mohr-Coulomb模型一致,它不仅能够反映衬砌结构蠕变的全过程,且能模拟材料的黏弹塑性变形特性,解决了典型Burgers蠕变模型只能描述黏弹性蠕变的缺陷。同时也研究了三轴试验条件下组合蠕变模型参数的求解方法,得到隧道衬砌混凝土的蠕变参数。
The MTS-815 hydraulic servo system was used to test the tunnel lining concrete specimens under triaxial compression creep test. When the compressive creep strength reached 85% of the compressive strength of concrete specimens, the accelerated creep stage was entered. The characteristics of triaxial compression creep deformation of tunnel lining concrete are analyzed. It is determined that the creep characteristics of lining concrete can be reasonably described by using the viscoelastic-plastic model which is a combination of Burgers model and Moore-Coulomb criterion. The viscoelastic state of the composite model is consistent with the Burgers model. The plastic state is consistent with the Mohr-Coulomb model. It not only reflects the whole process of lining creep but also simulates the viscoelastic plastic deformation of the material and solves the typical Burgers creep model Only viscoelastic creep defects can be described. At the same time, the method of solving the creep model parameters under triaxial test is also studied, and the creep parameters of tunnel lining concrete are obtained.
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