桂林理工大学学报2017，Vol.37Issue(3)：541-546,6.DOI:10.3969/j.issn.1674-9057.2017.03.024
近距离交叉隧道软岩蠕变特性研究
Study on creep properties of soft rock in adjacent cross tunnel
摘要
Abstract
To investigate the creep properties of siltstone in the segment from an expressway tunnel in Yunnan and on top of an existing rail tunnel,a series of tri-axial step loading creep tests were conducted on samples using TLW-2000 rock tri-axial rheometer.Results of tests indicate that the creep deformation and transient deformation decrease with the increase of confining pressure,when subjected to the identical deviatoric stress and as the steps of loading cumulates,the creep strain exhibits a trend that the creep strain increases first,stabilizes then and increases dramatically in the end.Moreover,the initial creep velocity decreases with the increase of confining pressure.Considering the damage and hardening effect during creep,a nonlinear creep constitutive model is utilized to depict the creep properties of siltstone.The fitting results show that the nonlinear creep constitutive model is competent.关键词
岩石/三轴蠕变试验/分级加载/非线性模型Key words
rock/tri-axial creep test/step loading/nonlinear model分类
建筑与水利引用本文复制引用
赵栋琪,邓琴,宋政群,武松..近距离交叉隧道软岩蠕变特性研究[J].桂林理工大学学报,2017,37(3):541-546,6.基金项目
云南省交通科技项目[云交科教(2016)140(A)] （2016）
