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砂岩峰后蠕变失稳特性试验研究
Experimental study on post-peak creep instability characteristics of sandstone
投稿时间: 2017-05-05  最后修改时间: 2017-08-24
DOI:
中文关键词:  岩石力学  峰后蠕变  损伤岩样  初始围压  围压增量  蠕变失稳
英文关键词:rock mechanics  post-peak creep  damaged rock sample  initial confining pressure  confining pressure increment  creep instability
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
刘圣 资源环境与安全工程学院 15673268372@163.com 
李树清 湖南科技大学南方煤矿瓦斯与顶板灾害预防控制安全生产重点实验室 lsq-hnust@163.com 
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中文摘要:
      为揭示岩石峰后蠕变失稳特性,利用MTS815电液伺服岩石力学试验系统,对红砂岩进行了峰后蠕变试验,采用线性回归的方法估算了蠕变失稳时间,探讨了损伤、初始围压以及围压增量对峰后蠕变特性的影响规律。结果表明:随着损伤的加大,蠕变变形速率增大,蠕变失稳时间缩短。同一围压下,各级应力水平下蠕变量随应力水平的增大而增大,且服从指数函数关系。增大初始围压,各级应力水平下蠕变变形速率均有一定程度的降低,且对等速蠕变阶段蠕变速率的影响较加速蠕变阶段蠕变速率大,蠕变失稳时间延长。施加围压增量,大大减小了蠕变变形速率,促使了加速蠕变阶段向等速蠕变阶段转化,明显延长了蠕变失稳时间,减小了蠕变形变量。研究结果为工程围岩的长期稳定性分析提供了参考依据。
英文摘要:
      In order to reveal the post-peak creep instability characteristics of rock, the post-peak creep test of red sandstone was carried out by using the MTS815 electro-hydraulic servo rock mechanics test system. The creep instability time was estimated by the linear regression method. The influence of damage, initial confining pressure and confining pressure increment on post-peak creep characteristics were explored. The results show that with the increasing of damage, the creep deformation rate increases and the creep instability time is shorter. Under same confining pressure, if stress level becomes greater, the creep strain variable in different stress levels will also increase exponentially. With a higher initial confining pressure, the creep deformation rate of stress levels at all levels decreases in a certain degree. At the same time, the effect of creep deformation rate on constant velocity creep stage is greater than that in accelerated creep stage and the creep instability time is longer. When applying an increment on confining pressure, there will be a great decrease in creep deformation rate. Consequently, the accelerated creep stage will transform to the constant velocity creep stage faster. The creep instability time is significantly extended while the creep strain is reduced.The research results provide certain reference for the long-term stability analysis of the engineering surrounding rocks.
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