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含水率及围压对砂岩蠕变特性的影响研究
Study on the Influence of Water Content and Confining Pressure on the Creep Properties of Sandstone
投稿时间: 2016-11-06  最后修改时间: 2017-03-01
DOI:
中文关键词:  压缩蠕变试验  含水率  围压  砂岩  蠕变特性
英文关键词:compression creep test  water content  confining pressure  sandstone  creep behavior
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
孙彦峰 河南省核工业地质局 syfhgy1966@163.com 
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中文摘要:
      在荷载作用下,岩石不仅表现出弹性和塑性,而且具有与时间相关的性质,即岩石的流变性。工程实践中,岩石流变现象随处可见,岩石流变所造成的危害也不容忽视。但目前在岩石含水率及围压对其流变特性影响研究仍不完善。作者采用岩石三轴压缩流变试验仪开展了不同含水率及围压条件下的砂岩压缩蠕变试验。试验发现,围压越大,砂岩的蠕变量越小,但当围压达到一定值后,围压对蠕变量的影响降低;砂岩含水率越高,瞬时应变越大、破坏时应变越大、长期强度越低,瞬时应变和破坏时应变均与含水率呈线性关系,长期强度与含水率呈负指数关系。
英文摘要:
      Under the condition of load, rock not only shows the elasticity and plasticity, but also has the property of time correlation which is the rock rheological property. The rock rheology is common in engineering practice, and the harm caused by rock rheology cannot be ignored. The research on the influence of water content and confining pressure on the rheological properties of rock is still under research. In this paper, the creep tests of sandstone under different water content and confining pressure are carried out by using three axial compression rheological testing apparatus. The test shows that the greater the confining pressure, the creep of sandstone is lower. And when the confining pressure reaches a certain value, the influence on the creep deformation is reduced. The higher water content, the greater the instantaneous strain and failure strain, and the long-term strength is lower. The instantaneous strain and failure strain are linear with water content. The long-term strength has a negative exponential relation with moisture content.
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