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片麻岩蠕变力学特性及蠕变模型研究
Study on Creep Mechanical Properties and Creep Model of Gneiss
投稿时间: 2017-04-05  最后修改时间: 2017-05-29
DOI:
中文关键词:  岩石试验  蠕变  广义Kelvin模型  模型参数
英文关键词:rock experiment  creep  generalized kelvin model  model parameters
基金项目:国家自然科学基金(5157041488)、(51404130)、(51204186)资助,国家重点研发计划项目(2016YFC0600704)资助
作者单位E-mail
梁冰 辽宁工程技术大学 lbwqx@163.com 
张涛 辽宁工程技术大学 852032995@qq.com 
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中文摘要:
      采用自制三轴蠕变仪,在恒定围压分级增轴压的加压条件下完成了片麻岩三轴压缩蠕变试验。结合蠕变试验结果,提出了含有广义Kelvin单元体的岩石蠕变复合模型,最终利用不同应力水平下岩石蠕变试验曲线对蠕变参数进行辨识,确定了模型参数。研究结果表明:随着应力水平的不断提高,试样蠕变经历了衰减蠕变、稳态蠕变、加速蠕变三个阶段;试样在围压10MPa条件下,轴压达到150MPa时出现加速蠕变阶段,加速蠕变启动时间为11.56h;蠕变试验等时曲线显示片麻岩蠕变具有较好的线性特征;与试验结果对比显示,二单元广义Kelvin复合蠕变模型能够更加准确描述片麻岩蠕变特性。研究结果对硬岩蠕变特性研究具有一定的参考意义。
英文摘要:
      The triaxial creep test of gneiss was carried out under the condition of constant confining pressure and increasing axial compression using a self-made three axis creep tester. Based on the creep test results, a rock creep complex model with generalized Kelvin element is proposed, Finally, the creep parameters were identified by rock creep test curves at different stress levels, and the model parameters were determined. The results show that with the increase of the stress level, the creep of the specimen undergoes three stages: decay creep, steady state creep and accelerated creep. Under the condition of confining pressure 10MPa, when the axial compression reached 150MPa, the accelerated creep stage appeared, and the accelerated creep start-up time was 11.56h; The isochronous curves of creep test show that gneiss creep has better linear characteristics; Compared with the experimental results, it is shown that the two-element generalized Kelvin composite creep model can describe the creep characteristics of gneiss more accurately. The research results are of significance as a reference for the study of creep characteristics of hard rock.
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