隧道围岩在富水环境下流变现象显著。以某砂岩隧道为研究对象,开展砂岩饱和状态下的三轴压缩蠕变试验,建立考虑含水率的损伤表达式。砂岩流变性态为黏性-黏弹性-黏塑性,通过统一流变力学模型理论确定蠕变模型结构为H- N -H｜N -N｜S,基于此模型进行损伤演化,从而得到蠕变损伤模型并将其推广为三维情形。将本构模型三维差分化,通过C++和FISH语言在FLAC3D中实现了二次开发。还原实际试验条件,进行仿真验证,证明二次开发成功及模型参数求取的正确性。建立隧道三维模型,调用自定义蠕变本构模型,进行不同蠕变时间下的数值计算,验证本文蠕变损伤模型在岩体工程应用中的可行性。研究成果可为类似本构模型的构建与开发及隧道长期营运安全性分析提供参考。
Abstract
Notable rheological behavior has been observed in the surrounding rock of tunnel in water-rich environment. The expression of creep damage in consideration of water content is established through triaxial compression creep test on sandstone at saturated state. The rheological behavior of sandstone is visco-viscoelastic-viscoplastic. The structure of creep model is determined as H-N-H｜N-N｜S by the unified rheological mechanics model theory. On such basis, the creep damage model is obtained through damage evolution and is extended to three-dimensional case. By three-dimensional difference computation of the constitutive model, secondary development is completed in FLAC3D by C++ and FISH languages. The secondary development is proved successful and the parameters of the model are correct via numerical verification. The present creep damage model is also verified feasible by three-dimensional computation of the tunnel under varied creep time. The research results offer reference for establishing and developing similar constitutive models and analyzing the safety of long-term tunnel operation.
关键词
砂岩 /
蠕变损伤 /
本构模型 /
二次开发 /
数值仿真 /
位移监测
Key words
sandstone /
creep damage /
constitutive model /
secondary development /
numerical simulation /
displacement monitoring
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基金
辽宁省“兴辽英才计划”青年拔尖人才资助项目(XLYC2007146);国家自然科学基金项目(51879189)
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