摘要
为研究中国盐穴储库中三种典型岩石的长期蠕变特征,展开了纯盐岩、含盐泥岩以及钙芒硝盐岩单级加载时长为14 d、总时长约为60 d的单轴分级加载蠕变试验,并对蠕变过程中盐岩的轴向及横向蠕变应变进行了测量。试验结果发现:①蠕变破坏后,纯盐岩的变形远大于含盐泥岩、钙芒硝盐岩,纯盐岩的最终轴向、横向蠕变应变量分别为5. 70%、-2. 93%,含岩泥岩最终轴向、横向蠕变应变量分别为1. 09%、-0. 67%,钙芒硝盐岩最终轴向、横向蠕变应变量分别为0. 32%、-0. 14%;②纯盐岩的长期强度低于含盐泥岩,钙芒硝盐岩强度最高,纯盐岩试件对应的长期强度约为11. 26 MPa,为短期抗压强度的45. 04%,含盐泥岩的长期强度值为21. 50 MPa,为短期抗压强度值的47. 78%,钙芒硝岩盐的长期强度最高,达到37. 42 MPa,为短期强度的49. 89%;③轴向、横向等时应力-应变曲线拐点能够相对应,基于横向蠕变曲线的等时应力-应变法能够确定盐岩的长期强度。
In order to investigate the long-term creep characteristics of three typical rocks in the salt caverns in China,the stage loading of pure salt rock,salt-bearing mudstone and glauberite salt rock with one single-stage loading time lasts 14 d and a total length of about 60 d was carried out with the axial and lateral strains measured during the creep process. The test results show as follows. ①After creep failure,the deformation of pure salt rock is much larger than that of salt mudstone and glauberite salt rock. The final axial and lateral creep strains of pure salt rock are 5. 70% and-2. 93%,respectively,and the final axial and lateral creep strains of rock-bearing rock are 1. 09% and-0. 67%,respectively. The lateral creep strains are 0. 32% and-0. 14%,respectively. ②The long-term strength of pure salt rock is lower than that of salt-bearing mudstone,and the strength of glauberite is the highest. The long-term strength value of the pure salt rock specimen is about 11. 26 MPa,which is 45. 04% of the short-term compressive strength value,and the long-term strength value of the salt-bearing mudstone is 21. 50 MPa,which is 47. 78% of the short-term compressive strength value. The long-term strength is the highest,which is37. 42 MPa,which is 49. 89% of the short-term strength. ③The axial and lateral iso-time stress-strain curve inflection points can correspond,and the isochronous stress-strain method based on the transverse creep curve can determine long-term strength of the salt rock.
作者
张强星
刘建锋
廖益林
吴池
ZHANG Qiang-xing;LIU Jian-feng;LIAO Yi-lin;WU Chi(State Key Laboratory of Hydraulic and Mountain River Engineering,Sichuan University,Chengdu 610065,China;China Municipal Engineering Central South Design and Research Institute Co.LTD.,Wuhan 430010,China)
出处
《科学技术与工程》
北大核心
2019年第28期297-303,共7页
Science Technology and Engineering
基金
四川省青年基金(2017JQ0003)资助
关键词
盐岩
杂质成分
蠕变
长期强度
salt rock
impurity components
creep
long-term strength
