CAJ | 학술논문

为了研究红砂岩蠕变特性，对红砂岩进行了单轴压缩蠕变试验。以试验结果为基础，建立了非线性黏弹塑性蠕变模型，并基于BFGS非线性优化算法对该模型参数进行了识别。结果表明，红砂岩具有明显的蠕变特征，建立的模型可以同时表征岩石瞬时加载应变、衰减蠕变、稳态蠕变以及加速蠕变等蠕变特征。最后，将非线性黏弹塑性蠕变模型进行了大型有限差分法软件FLAC3D的二次开发，并对红砂岩单轴蠕变数值模拟试验，同时将数值模拟蠕变曲线与试验蠕变曲线进行了比较分析，验证了非线性黏弹塑性蠕变模型的实用性。
위료연구홍사암연변특성，대홍사암진행료단축압축연변시험。이시험결과위기출，건립료비선성점탄소성연변모형，병기우BFGS비선성우화산법대해모형삼수진행료식별。결과표명，홍사암구유명현적연변특정，건립적모형가이동시표정암석순시가재응변、쇠감연변、은태연변이급가속연변등연변특정。최후，장비선성점탄소성연변모형진행료대형유한차분법연건FLAC3D적이차개발，병대홍사암단축연변수치모의시험，동시장수치모의연변곡선여시험연변곡선진행료비교분석，험증료비선성점탄소성연변모형적실용성。
In this paper, to study the creep properties of red sandstone, the uniaxial compressive creep test was carried out. Based on the test results, a non-linear visco-elastic-plastic creep model was estab-lished, and the parameters of the model were identified by using the nonlinear optimization algorithm of BFGS. The results show that red sandstone has obvious creep characteristics, and the model can better reflect the creep behaviors of instantaneous loading strain, decay creep, steady creep and accelerating creep, etc. Finally, the non-linear visco-elastic-plastic creep model was fruther developed by using FLAC3D simulation software, and the uniaxial creep numerical simulation of red sandstone was carried out. The creep curves of numerical simulation and experimental results were comparative analyzed, and the practicability of non-linear visco-elastic-plastic creep model was verified.