| 梁冰*,张涛,王俊光,李刚,武鹏飞.片麻岩蠕变特性试验研究[J].实验力学,2018,33(3):451~460 |
| 片麻岩蠕变特性试验研究 |
| Experimental study of gneiss creep properties |
| 投稿时间：2017-02-22 修订日期：2017-05-06 |
| DOI：10.7520/1001-4888-17-035 |
| 中文关键词: 岩石试验 蠕变 蠕变模型 参数识别 |
| 英文关键词:rock experiment creep creep model parameter identification |
| 基金项目:国家自然科学基金(51404130)、(51774165)、(5157041488)资助；国家重点研发计划项目(2016YFC0600704)资助 |
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| 中文摘要: |
| 为了对红透山铜矿片麻岩蠕变特性及深部采场(-467、-827中段)出现时效性片帮破坏问题进行研究，采用室内蠕变试验和理论分析相结合的方式对片麻岩的蠕变特性进行了分析。结果表明：随着应力水平的不断提高，岩样蠕变经历衰减蠕变、稳态蠕变、加速蠕变三个阶段。其中，稳态蠕变阶段持续时间最长，加速蠕变阶段变形速率波动最大，且以非线性方式逐渐增加。试样P-4与P-8在围压10MPa条件下的起始蠕变应力阈值分别为50MPa及80MPa，长期强度分别为90~100MPa及170~180MPa，加速蠕变启动时间分别为34.68h及2.4h；最后基于模式搜索(PS)改进非线性最小二乘法，并结合岩石蠕变试验结果，对蠕变模型参数进行反演。通过反演得到的理论曲线与试验曲线的吻合效果较好，由此证明了蠕变模型的正确性和合理性。 |
| 英文摘要: |
| In order to study the creep characteristics of gneiss taken from copper mine at Red Mountain and aging wall caving failure problem in deep stope (-467 and -827 middle piece), the creep characteristics of gneiss were systematically analyzed by the combination of indoor creep experiment and theoretical analysis. Results show that with the increase of stress level, gneiss specimen creep undergoes following three stages: attenuation creep stage, steady state creep stage and accelerated creep stage. Among which, the steady state creep stage has the longest duration, and during accelerated creep stage, the deformation rate fluctuates most and gradually increases in a nonlinear way；The initial creep stress thresholds of specimens P-4 and P-8 under confining pressure of 10MPa were 50MPa and 80MPa, respectively, and the long-term strengths were 90~100MPa and 170~180MPa, respectively, and the starting time of accelerated creep is 34.68 hours and 2.4 hours, respectively. Finally, nonlinear least squares method was improved based on pattern search (PS), and combined with gneiss creep experimental results, the creep model parameters of the are inversed. The theoretical curves obtained by inversion are in good agreement with the experimental curves, which proves the correctness and rationality of the creep model. |
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