摘要
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。
In this paper, to study the creep properties of red sandstone, the uniaxial compressive creep test was carded 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 FLAC^3D 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.
出处
《采矿与安全工程学报》
EI
北大核心
2013年第5期744-747,共4页
Journal of Mining & Safety Engineering
基金
重庆大学山地城镇建设与新技术教育部重点实验室访问学者基金项目
国家自然科学基金项目(41302223)
重庆市科委基础与前言研究计划项目(CSTC2013jcyjA90004,CSTC2010BB7334)
中国石油科技创新基金项目(2010D_5006_0210)
关键词
红砂岩
蠕变
蠕变模型
数值模拟
red sandstone
creep
creep model
numerical simulation
