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片麻岩蠕变特性试验研究
Experimental Study on Creep Properties of Gneiss
投稿时间: 2017-02-22  最后修改时间: 2017-05-06
DOI:
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 rate  Creep model  Parameter identification
基金项目:国家自然科学基金(51404130)、(51474120)、(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:
      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,采用室内蠕变实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,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、试样P-8在围压10MPa条件下的起始蠕变应力阈值分别为50MPa、80MPa,长期强度分别为90MPa~100MPa、170MPa~180MPa,加速蠕变启动时间分别为34.68h、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,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 behavior of gneiss and the failure of the deep stope (-467 and -827 middle stope) in the deep copper mine, the creep characteristics of gneiss were systematically analyzed by the combination of indoor creep experiment and theoretical analysis. The results show that with the increasing level of stress, the creep of rocks undergoes three stages: decay creep, steady state creep and accelerated creep, in which the steady state creep stage has the longest duration and the deformation rate of accelerated creep stage fluctuates most and increases in a nonlinear way;The initial creep stress thresholds of the specimen P-4 and the specimen P-8 under confining pressure of 10MPa were 50MPa and 80MPa respectively, and the long-term strength were 90MPa~100MPa and 170MPa~180MPa respectively, and the start-up time of acceleration creep are separately 34.68h,2.4h;Finally, the nonlinear least squares method is improved based on the PS model, and the parameters of the creep model are inversed in combination with the creep test results. The inversion results of the theoretical and experimental curves are in good agreement with each other, which proves the correctness and rationality of the nonlinear creep model.
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