岩土工程学报Issue(8)：1462-1468,7.DOI:10.11779/CJGE201508015
不同粒度砂岩力学和渗透特性试验研究
Experimental study on mechanical and permeability properties of sandstone with different granularities
摘要
Abstract
In order to investigate and reveal the influence of granularity on mechanical behavior and permeability characteristics of sandstone, the conventional triaxial tests and triaxial compression and penetration tests are conducted on coarse sandstone, medium sandstone and fine sandstone of a project by using the MTS815 Flex Test GT rock mechanics test system. The researches show that the strength of sandstone and the parameters of shear strength,cohesionc and internal friction angleφ, increase with the decrease of granularity. The strength of sandstone has a decrease of the range between 5.15% and 24.66%. The permeability varies according to the characteristics of deformation: at the elastic stage, the holes inside the sandstone are compacted and the permeability decreases; at the elastic-plastic stage, the permeability increases slowly at first, and then moves up sharply and reaches the maximum value at the post-peak; finally, permeability decreases. The permeability of sandstone with the same granularity decreases with the increase of confining pressure, and the permeabilities of all samples under different confining pressures can be drawn as a linear function. Under the same confining pressure, there is a magnitude difference between the permeabilities of sandstone with different granularities. As for the overall performance of permeability, the permeability of the coarse sandstone is about 105 times that of the medium sandstone, and the permeability of the medium sandstone is about 10 times that of the fine sandstone.关键词
砂岩/粒度/常规三轴试验/三轴渗透试验/渗透率Key words
sandstone/granularity/conventional triaxial test/triaxial compression and penetration test/permeability分类
建筑与水利引用本文复制引用
邹航,刘建锋,边宇,周志威,卓越..不同粒度砂岩力学和渗透特性试验研究[J].岩土工程学报,2015,(8):1462-1468,7.基金项目
国家重点基础研究发展计划（“973”计划）项目（2011CB201201）；国家自然科学基金项目 （）
